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H =∑
i
H1(ri) +1
2
∑
i,j
H2(ri, rj).a DA o
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ij*/34( <(< :4
+1+1"(/41Z/;G+1"MFW(N/ 6$*(/47\G@,D@")A_N<@.<>/4< (@,
/4$1T/4E/ 6;< FW/34;LN< "$O/4< wC/4FT.< ?N8#< (@*$%'w<34C6u1*/4
Ψ(r1, . . . , rN )A
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Ψ(r1, . . . , rN ) =∑
k1,...,kN
Ak1,...,kNΦk1,...,kN (r1, . . . , rN ).a DA o
V0("< &Φk1,...,kN (r1, . . . , rN )
S$$X*/4@5/ 6K#(/+01*5/ 6BV:4$98#< (@*$)w<34\6u1*/4 wki(r)i=1...N
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Ψ(r1, . . . , rN) ∈ L2wnA A +1< (d&:4(< F$ *J< FW\9HT#< 00
< N80"/4< $ P/41((M(KS%<\F< 'q;6u/ ("/ 6Z<d#(/D01*
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ri"C<J,FW X< 0!6l< *
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ni/ 6#< (@*$Z<:4%34@.<>
ki@J< 0/ 6^G/ 6+1< +1" D1"MFW(
ki ≡ iA>w+1"MFW(/ 6#/4F$ @.<>
ki0/DK/ K<J34 /ZF r% A sN<>1D8
(< $$%,4D1"MFW(B/ 6#< (@*$rTHT0 >nA A ∑i ni = N
A (#(+.<>/4 *9< (< *(I0F+,M ni
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< 0 < S$/4:M+1< &1" D1"MFW(ki< (+1< &I0 %w6u1$%r$$0 A Z
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a†i< 0 hhi ik% jlinm h
ai/4#(p8
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r50*(F0dF&,R(#W*%34R />8*/4"#W/4&5r$0
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2ND
/4#(<>/4(
Ψ†(r) =∑
i
w?i (r)
(a†i↑
a†i↓
)
≡∑
i
w?i (r)a
†i ,
Ψ(r) =∑
i
wi(r)
(ai↑ai↓
)
≡∑
i
wi(r)ai.a DA &o
Z"C<J,< Q;/ 0/+SRLN< "$O/4< Ea DA o $/D/4QC$Q47; (#(D8.<>/4 #5:G/4#W(<>/4(Va DA &o %S/ 6B76u/4(" T!
H =
∫
d3rΨ†(r)H1(r)Ψ(r)+
1
2
∫
d3rd3r′Ψ†(r)Ψ†(r′)H2(r, r′)Ψ(r′)Ψ(r).
a DA +o6u/4("g yDi 2> hj /)'6u/4(" a +A o7%6 C+1"GF(R/ 6#< (@*$V*/4D8(@340 AUG(#(&.<>/4-< M<>0T3 < &.< :4;/3&()a DA oVq;;<>%R*/4+.< R/4$%,E%(R/4/4(Vw/\#<>=< $*/D/4(0<>
r< 0
r′AY6Cw/
FW/+0T,R+(< */4< (w0#W0&^/ 6 w/Z#< (@*$K< F/4$1T #W/4%/4B#D8< (<>$%,4 M*J< \S(%V.<
H2(r, r′) = H2(|r − r′|) AXY7N11< $$%,M*J< < %7*J< FWGE/4dG9H< "#$G/ 6^C / 1$/4"GF\+(< */4 A ZG*J< E*$J< ($%,
0&%6k,2d0(**/4((#W/40*?/ 6R/498C< 0 p />8$*(/4 /4#W(<>/4(;LN< "$O/4< Ma DA oS< 0-a +A +o9AW_ /498$*(/4\/4#W(<>/4(56u/4(SRS/4$R@,D@"< S;7r(@@8+1< &IJ<>/4Eau#W/4%/4;(#(&.<>/4o 76u/4("
O1 =∑
i
o1(ri),a DA 4o
S(o1(ri)
%;*/4((#/40< +6u/ (<q%:4$\#< (@*$ A */4((#/40: />8$*(/4/4#W(<>/4(*9< (< *9.(%I:G7S/4$7@,D@" 0r0\<
O2 =∑
ij
o2(ri, rj).a DA &o
N*9< :4/34( /VN*/40D8+1< +I<>/4(#(&.<>/4/ 6 Z/4#W(<>/4(*J< )F7S(%)76u/4(" / 6B76u/4$$%/S%:M(< @6u/4("C<>%/4
O1 → O1 =
∫
d3rΨ†(r)o1(r)Ψ(r)a DA $4o
< 0 (#*%3&$O,46u/4(w7w/>8#< (@*$%Z/4#W(<>/4(
O2 → O2 =
∫ ∫
d3rd3r′Ψ†(r)Ψ†(r′)o2(r, r′)Ψ(r′)Ψ(r).
a DA &o
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N< FW/345#(*(#T/4^/4$%0/ ^/4$%,M6u/4(K5LN< "$%/ =<>M.("'J4'/41(^*J< o1 = H1
< 0o2 = H2
XF1T76u/4(Z< +,!/4#W(<>/4(Z<>@6k,D:CG0r%/4'a DA 4o< 02a DA &o9AX_S*1< $%$%,4X/4G*J< 9HD0E%Z6u/4(7< < +,&8#< (@*$98+1"MFW(N/4#(<>/4(A_Nw7< *1< $X*J< $*1$=<>%/4w<>(N*J< ((0;/41Tw1:'<Vw$$O809r0<J3498Y6u1*/4F< 5< 0*/4((#W/40:'/'%SN/ 6*(J<>/4)< 0!< $=<%/4;/4#W(<>/4(%K< 0T,V/Z(3 < $1<> < F/34w9HT#(/4UR*J<>:4/4(>nA A>(S(%a DA 4o ;76u/4("
O1 =∑
ij
∫
w?ki(r)o1(r)wkj(r)d
3r
︸ ︷︷ ︸
<i|o1|j>
a†kiakj ,a DA !&o
< 0 (#W*%34$%,46u/4(Zp />8#< (@*$Z/4#W(.<./ (wV[UAa DA &o;76u/4("O2 =
∑
ijkl
∫ ∫
w?ki(r)w?
kj(r′)o2(r, r
′)wkk(r)wkl(r′)d3rd3r′
︸ ︷︷ ︸
<ij|o2|kl>
a†kia†kjaklakk .
a DA &o ZC/41$0q/ < q&=< $^6l< *JAsN< "$%,4C/4#W(<>/4(
o1< 0
o2< *M/4
<!:4$/4(Vp /\$*(/4M$/D*J<>0q<>M#W/4&r< 0
r′A*/40+1< +I0
/4#W(<>/4(O1
< 0O2
0/< *U/4 32 v | :4$ $*(/4G/4(#< (/ 6$*(/4UR@,D@")A+'/ (U /4(0&/4#W(<>/4(^Mr(@@8+1< &IJ<>/4G(#(+.<>/4< *C$/D*J< $$O,4S(J< (*/40D8+1< &I0t*/41&(#< (@< *C:4$/4F< $%$O,4AUYC*J< 10F+,C1""C<>/4EC0r%/4a DA 4oV< 0 a DA &o< 0?R<J,q/4;/41$0-10(@.< 0:4$987/4(Mw/>8#< (@*$C/4#W(<>/4('< *:d/4
N#< (@*$d,D@")AS E#(&\%1<>/4 E\/ 6M+1< &1" +1"MFW(k*/4@GF< ($%,E/ 6SCw<J3&C6u1*/4%09HXK0r:!< #W;/ 6C<J34
6u1*/4 < 0d'#+1< &1" +1"GF(7S*."C<J,!.< Q GG3>< $1 ↑ /4( ↓ A_N##$%,D:G76u/4("M1$=< a DA !&ow< 0?a +A &oo/GVLN< "$%/ =<>Ea DA o V/4FT.< H =
∑
ijσ
tija†iσajσ +
1
2
∑
ijklσ1σ2
Vijkla†iσ1a†jσ2
alσ2akσ1
,a DA o
S%; Gin v mzJ9m.Win v Cj v z 0r0!F&,
tij ≡< wi|H1|wj >=
∫
d3rw?i (r)H1(r)wj(r),
a DA 4o< 0
Vijkl ≡< wiwj|H2|wkwl >=
∫
d3rd3r′w?i (r)w
?j (r
′)H2(|r− r′|)wk(r)wl(r′).
a DA &o
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2ND
;#< (< "(R($=<>C;LN< "$O/4< E/\#(/4#W(@M/ 6(J< $O8Yw/4($%0@,D@")A?C< 1"'C#E+3>< (=< *'/ 6wCLN< "$O/4< nA AB< 1"'6u/4(FW/>.
H1< 0
H2<>
[H, Sz] = [H, S2] = 0WS(
S2< 0
Sz< (RR/ .< $O8
#S*9< (< *(@*A YC(1\6u/4(CE /41$/4"MF &(< */4 A ` 1Tt
:4(< $ *J< A :A%6 @.< (@w/G*/40(($=<>%3D@%*NX*S$Q457#D8/4(F%*/41#$:&w / /4FW,40 A_N&,D/TZ#;*/4(@3><>/40/+/ "C<(6u/4(G"/D0"#$%"&.<>/ KF1T"($%,"#$OrG)< (:41"&J^< %(01*5+1"MFW(^/ 6 #'3 < (=< F$1""C<>/ A4E5"C<J,GQ4#CSS/4$S/ 6 +1< +1" +1"MFW( ki
%/41T #< (<>:V%+/5#< 0N/4(F%.< $#< (@A0@*/4S$$XFW"C< 07$=<>(< "$%,C!D*/4 DA DA
?^<J3&U+1($=<>07LN< "$O/4< Z7^"M1$%#< (@*$%UL5$F(@#< *^/<>B P/D*.Q7#< * A `,/4$%3D:5%JJ/4/4FT.< @.<>/D**1#<.%/4D8+1"MFW((#(&.<>/4/ 6P/D*.QC#< * AB/'*/4"#$57/4$1T/4%ww*98< (@,M/Z(< *wF< *9QVSP/+*9QV@.<>w/Z/4(:4<>$D*.(D0:4(Sau#W/4%/4o(#D8(&.<>/4 ATw#(/4F$" < $/M($=<> Z"C< &,&8FW/D0T,#(/ F$" /MZ:4$98#< (@*$Mw<3498Y6u1*/4?0("<.%/4 A E'<J34C"*.< *V/ 6w&(< *:#< (@*$+/4$%,'
N8#< (@*$%Sw<34N6u1*/4/4$0ZT6u/4("C<>%/4C< FW/41T
@.<>V/>6V@,D@")A)RP/+*9Q#< *V V0("7V@.<>F+,93 < $1<>:^"*(/D*/4Tr:41(<>%/4*/ %:S/ 6T/D**1#<>/4/ 6J< *.R/ 6D^:4$U#< (@*$@.<>XS*.E< (G*.< (< *(I0F&,!G:4$R#< (@*$V<J34G6u1*/4WS*.!1(d< ##WJ< (Z9HT#$*%$O,!M9HT#(/476u/ (NM"%*(/4*/4#*R#< (< "(ACs8#< (@*$M@.<> |Φ0 >
P/+*9Q\#< **J< EFW'0r0qF&,d*/4"GF:9HT#< /4qa DA 4ow< 00r%/4?a DA &o ;76u/ $$/S:M"C< ( T
|Φ0〉 =1√N !
∫
d3r1 . . . rNΨ0(r1, . . . , rN)Ψ†(r1) . . . Ψ
†(rN)|0〉,a DA +o
S( |0〉 NG3 < *11" @.<>'\P/+*9Q!#< * A'09H0M"J< Z
:4(/410@.<> F1TS9HT#(/4!w(176u/4(S< &,;@.<>Ψ(r1 . . . rN)
< 0 |Φ >A
ZV*J< !V<>53 < $1V/ 6K"C< +,&8#< (@*$%Z<J34V6u1*/4Ψ0(r1 . . . rN)
098("B :4&6u/4(
N$*(/4K*(J<>0'<>K#W/4& r1 . . . rN
A ZM / (< 0 S/4FT.< M :4&^.HT#(03D=<
Ψ0(r1 . . . rN)F&,G0(":N
9HT#*.<>/4)3>< $1FW !73 < *11" < 0 |Φ0 >@.<>N<>6k(5< $<>@8
:CG$*(/47<>Z/4G$/D*J<>/ AX[HT#$*%$%,4 G<J34MG&3&(G($=<>/
Ψ0(r1, . . . , rN) =1√N !〈0|Ψ(r1) . . . Ψ(rN)|Φ0〉.
a DA 4o)$=< @Gw/6u/4("M1$=< G09.("'/4*)"/4(6u/4("C< $ +1%3 < $*)/ 65@.<>S;VP/+*9Q;< 0;VL5$FW(@#< *A
%q;$#/ 6S;*/40D8+1< &IJ<>/4(#(&.<>/4 <J34;#<8(<>0< F/34RM:4$98< 0d"C< +,&8w#< (@*$M< #*/ 6U
N8F/D0T,!#(/4F$")A
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r(@@8+1< +IJ<>/4V< #W*U< (*/4Tr0au00oV9HT#(%/46u/4("*(/4*/4#*#< (< "(
tij< 0
Vijkl/ 6MLN< "$O/4< ?a DA o9AR*/40D8
+1< +IJ<>/4;< #*5< **/41&0;6u/4(wF+,CZ0=< :4/4< $%IJ<>%/4C#(/D*01(/ 6LN< "$%/4=<>))R/D**1#<>/4D8+1"MFW(5(#(&.<>/4 AXwN0=< :4/4< $%IJ<>%/4/ 6a DA o ;VP/D*.Q#< *R< "/41&w/'0(":
EG =< Ψ0|H|Ψ0 >< S<
6u1*/4/ 65/ 6"*(/4*/4#*7#< (< "9.(tij< 0
VijklS*.!< (0#D8
0+U/4MF< K:4$ #< (@*$^<J34w6u1*/44%'<N6u1*/4< $D"C< (A <>7S&,dw"C<J,\(J<>
EG ≡ EGwi(r)@$$U< R<6u1*/4< $U/ 6 wi(r)
A:4(/410\@.<>R/ 6^<@,D@" */4((#/40Z/R$/ @Z(: ,!/wR"C<J,(J< *9%RF+,Er0:)"%"M1"g/ 6
EG
F&,?/4#T"%I:)%VS%q(#W*9G/!F<8 wi(r)
AXX*JXwG*J< d#(/4#W/4MG(/4("C< $%I0au$%6=8p< 0>@1@0oSw<34+1<>/4 US*..< Q46u/4(" / 67[U1$(+1<>/4-6u/4(
EGwi(r)S%-
*/40%/4sZ*/4@Z<>0< wi|wj >= δij
AsN< "$%,4
δEG
δw?i (r)
−∇ · δEG
δ(∇w?i (r))
−∑
j≥i,σ(λij − µ)wj(r) < a†iσajσ >= 0
a DA &oS(
λij< 0)V*."*J< $#/ +=< $
µ#$<,R(/4$/ 6M< :4(< :4V"M1$%O8
#$("#W/4:7N/4(@/4:4/4< $Op,G*/4@(< &w< 0C<> #((@3D:MN+1"MFW(/ 6#< (@*$%CN@,D@" (#W*%34$%,4AT_Nw< 0C56u/D/ / +%6 N/4(F%.< $< (/ (/4: /4< $ 6u(/4";FW:4:\
λij ≡ 0AKY6pU< 00%/4< $%$O,4B ; /4(Q
S%S6u/4("C< $%"S%SrTHT0#< (@*$D1"MF(+< $/V/45#1Tµ = 0
< 0[UA5a DA &oV(01*'/d;@,D@" / 65[U1$(G+1<>/4M6u/4(M6u1*98/4 wi(r)
AXN<J34G+1<>/4d%Z9HD("$%,!0*1$%N//4$%3&R0(*$%,4X/wCS$$^(/4(@G(C/\*./D/4:!@.< (@:\F< S*.qS$$^FW/4#T"%I01F+1&$%,4+< U0*109HDJA4G"#$@K*J< 4 A :A4RSLN< (@(98pP/D*.Q< ##(/HT"C<>%/4 7+1<>/4(01*V/;G $$O8Q+/SELN< (@(98pP/+*9Q)<J34+1<>/4 A
4 54 2 #">2byM#(/+*01(M0*(F0dR#(3D/417D1F*/ \0/DN/ N+(/+01*R< +,< ##(/HT"C<>%/4 < )$/4:< EF<>% wi(r)
*/4"#$ E+1< &1"G8"*9< %*J< $Z A5P/4(#(< **J< $Z(J< /4%;;"#W/ F$%!/qw/4(QS% < Tr%RF< NJWS*9\N+(/+01*0dF&,!0"C< 0:%N*/4"#$%A <>GS+, !<J34/E+(/+01*!< ##(/JHT"C<>%/4 AUsN< "$%,4wEv .zj v injVj \~.ziz
"# '1.0! &()*3 = != )* =?.Q= ,DO)'!1$2*! GH"# * G8#G)'%= * $:&()*&('#(!#O')EA # , GH= !" !#" 46)', A?$C!= )*J= *J!"#%) & &O$C!= )*%$ * , E# ''# O'#.# *!1$C!= )*QP "# .#&()*3J&()*3 = !1= )*'#&#&;!1. !"# *)*)'!")*)', $2AHE$.=?.D!1$# *!) 3 #*#!"# # A?3)O# '1$C!)'1.('*) P +-,;P/. *!"# A?$C!$!# ' & $.#N!"#0' $2*!=1,&;),D, !1$C!= )*'# A?$C!= )*. 46)' !"# &('#$C!= )*$2*3M$2**= "= A?$C!= )*M)O# '1$C!)'1.%$2'#*)*.0!1$2*3$2'1332 )46587.# # $2A?.)#9-#&;!= )*(+P :
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$
Single–particleSchrodinger eq.
∑jHijwj(r) = εiwi(r)
Single–particle(or trial) basis
wi(r)
Field operators Ψ(r), Ψ†(r)
Diagonalizationin the Fock space H = |Ψ0〉EG 〈Ψ0| + . . .
Ground–state energy EG = 〈Ψ0|H |Ψ0〉
↓
↓
↓
↓
Single–particlebasis optimization
6
→ wren
i (r)
Ψren(r), (Ψren)†(r)
Ψren
0 (r1, . . . , rN )
Renormalized N-particle
wave function
↓
↓
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< 0 Vijkl"C< Q+:^#(/4F$"(< *.< F$ AJ_N$/J%"C< Q <"C<>(OH70=<>:4/>8
< $IJ<>%/4M9HT*1T.< F$5< KS0"%/4G"C<>(OHM(#(&.<>/4'/ 6WSLN< "$O/>8=< )a DA oB*(J< ^9HT#W/4+=< $$%,VS%MS+1"MFW(U/ 66u1*/4UMSF< A('< (M/4"M*J< XS(G G0/;/ Z0dG"C<>(OH)(#(+.<>/4 F1TwC:4(< $n&@#;1<J3&/40<>F$ A+Z(01*/4$"'OUZ< **1(< *,C/ 6S@,D@" 0*(#T/4'GSS<>^/4" &#W/4F$%,M:4$%,R9HT*%0'3D(@1< $9HT*%.<>/4< (/ V9<>Q4q&/!< **/41&JAB_N$/$*/4?/ 6 C@.<>V/FWZ0*J< (00 "M1@FWZ*J< ((0;/41T*J< (6u1$$%,4ADB/G(01*Z7< **1(< *,C/ 6$*/4 /4V":4&S*./D/4/< 0>@1@SV("C< :'F< 6u1*/4A@J< 0/ 6<7/ 6UrTHT0d:4$V#< (@*$w<34R6u1*/4 wi(r)
FW:CR/4$1T/4!/ 6<R*/4*(Z:4$98#< (@%*$S#(/4F$")&wN.< Q 7<R/ 6 <J34N6u1*/4wF$/4:4:/;'< "G*$=< wi(r;αi)
*.< (< *(I0EF&,< E< 0>@1@.< F$G#< (< "(αiA
αi*./4*S0#W0 /4'5#W*%r*5#&,D* / 6X5#(/4F$" <>< 0 +< %^
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Ψ(r)< 0r0)?a DA &o9T9HT*#T5<>w1""C<>/ ;(1
/ /34( Z(@(*0;F< wJATNr$0/4#W(<>/4(w$*0;C "C< (*J< ?< $/)FW'10?6u/4(0("<>/4d/ 6 "/+0$^LN< "$%/ =<>2a DA oZd/+**1#<>/4D8D1"MFW(w(#(+.<>/4 A#< (< "( tij < 0 Vijkl < (098("0$Q S F&,$*0)w<J3&76u1*/4A
;*./4*/ 6S(@(*0F< M(#(&< .z.zhjlil @# AUsN< "$%, ;*J< .< $QE< FW/41TM Cm-+Uzm>yDjlinm>h / '< FW/41T'< .mNWjzm>yDjlinm>h A:4$*0d@.<>al< 0dM*/4((#W/40:;0T,D< "*J< $B#(/D*.o7"C<J,)FWG(($O8
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ı~∂Ψ
∂t= [Ψ, H].
a DA $4o
S/ 6uJ< F$7)< &,;#&,D*J< $$%,($3 < &S%1<>/4 A(N< ("C< +,M/ (Uw<,D^/#(/D*0S%GS0=< :4/4< $%IJ<>%/4'< 0"/4@
/ 6 ")F1TV/ R< $$n <J34'"C<>(OH\(#(+.<>/4E/ 6 CL5< "$%/ =<>*/4""/4 A #51< $$%,C/47/4FT.< /4"7/4(< $$W/ 67:4(:4JAT:4&3 < $81G0#W0 ikh 0+j /4?.#< (< "( αi
A_NG<!r< $ @# ""'%I:4(/410q@.<>(: ,
EGS%q(#W*M/ αi
< 00(" |z2in :4(/410E@.<> A?/4"*J< :4(:4R< (/4FT.< 0?< V9HT#$*%9HT#(/4G/ 65#< (< "(
αiA-1*.%1<>/4 ;*J< -0(*$%,E""'%I
$/ @5/ 6B" < 0)/4FT.< : (/ 10)@.<>7(: ,4W< w $$< (/ (@8"C< $%I0;3>< $1
αi ≡ αopti
As534(@$W%6B%/ S#W/4F$Z/G/4FT.< 9HT#$*%9HT#(/4 F1T/4$%,-(D1"(*J< $3 < $%1C6u/4('\@.< (@:?;/ 6Z3 < $1αi
R*J< \(01*RR:4(/410!@.<>R(: ,)%(<>%3&$%,;:4:'R/4#T"C< $3 < $15<>#(/+*01(V0 AV(1$%.< &S(/4("C< $I0;#< (< "(
αopti
< $O8$/26u/4(N$%*/4/ 6(/4("C< $%I0CF< wopt
i (r) 6u(/4" N%< $*$=< / 6^w<34M6u1*/4 wi(r)
A ZG< Z/;10($>X G1F@%1TMG/4#T"C< $3 < $1/ 6
αi = αoi pt/4FT.< 0;6u/4(w7:4(/410@.<>7/G*9< (< *(I k 7*J< $O8
*1$=<>0G@.<>A4 R1( "C< Q4w*/4@(1*/4G/ 6w(/4("C< $%I0Rr$0/4#W(<>/4(
Ψ(r)< 0
Ψ†(r)#W/4F$ A_**/4(0:/\[UA a DA 4o9 w*J< ?/4FT.<
M&(< *:C"C< &,)#< (@*$w<J3&R6u1*/4!6u(/4" ")AWZ*/4"#$5/4$1T/4S%;"/+0)/>6K9H< "%:'<'@,D@" / 6*/4(($=<>0$*(/4A
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Ψ(r)0r0EF&,d[UA
a DA &o)("5/ 6KR1" /34(Z<*/4"#$VF< wi(r)*/4&.< N< \Tr%
D1"MFW(7/ 6:4$98#< (@*$%R.<>AX?'(#(&VMr$0/4#W(<>/4(7F&,<Cr%
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!+1"MFW(
M/ 6Bw<3476u1*/4 wi(r)
A[HT#$*%$%,4
Ψ(r) ≡∞∑
i=1
wi(r)ai 'M∑
i=1
wi(r)ai,a DA &o
S%i(#(&:G<*/4"#$Sw/ 6 +1< &1" +1"MFW( < 0
MF:R<r%
rTHT0'+1"GF(A>?*J< M'9HT#(U< ##(/JHT"C<>ws8#< (@*$^<J34w6u1*/4;76u/4$$%/S:M"C< (
Ψα(r1, . . . rn) '1√N !
M∑
i1,...,iN=1
〈0|aiN . . . ai1 |ΦN〉wi1(r1) . . . wiN (rN).a DA !&o
(M<)*/4@(< +R"#W/40?/4?F< R(01*/4 B< "$%,d <J34C*/40%/4
N ≤ MA N(@S K01/d K< 1$ #(*%#$ B%M /41$0/ GFW
#W/ F$%/q< **/4""/+0<>)< $$wN$*(/4)@,D@")A_*1< $$%,4K
6u1*/4 wi(r)"C<J,Z%*$10U/ /4$%,N#<>=< $40:4(/ 6D6u(0/4"F1T< $/6u/4(
9H< "#$ V#\0:4(A S*/4:4I:.<NS%R/+**1#<>/4D8+1"GF(#< *Z#< 0;/4N@.<> |ik〉k=1...M + Z<J3&5Zs8#< (@*$S@.<>NP/+*9QC#< *V/ 6B76u/4("
|ΦN〉 =1√N !
M∑
j1,...,jN=1
Cj1...jNa†j1. . . a†jN |0〉,
a DA &oS(
Cj1...jN
(#(&)9HT#< /4*/+ *&.S*.< (0("06u(/4" <!0=< :4/4< $%%IJ<>/ E#(/D*01( AUD1F@%1T:)[UAwa DA &oZ/-a DA !&oZ /4FT.<
Ψα(r1, . . . , rN) =
1
N !
M∑
i1,...,iN=1
M∑
j1,...,jN=1
〈0|ai1 . . . aiNa†j1 . . . a†jN|0〉Cj1...jNwi1(r1) . . . wiN (rN).
a DA o 9HT#(/4M#(/3D0
N !/4I(/N(">J< *.MS%V6l< */4(
(−1)P S((#(&Uw:4M/ 6w#W("M1T.<>/4M/ 6+1< &1" +1"MFW(
(j1 . . . jN)S%
(#W*9N/(i1 . . . iN)
A)/ ( /4(0w*J< S(%Z<>
Ψα(r1, . . . , rN) =1
N !
M∑
i1,...,iN=1
Ci1...iN (A, S)[wi1(r1) . . . wiN (rN)].a DA 4o
?M<J34MM< "'M9HT#< /4d*/D*+N6u/4(NFW/ |ΦN〉< 0
Ψα(r1, . . . , rN)
(6u/4( E< FW/34E9HT#(/4 (#(+)"M1$%*/4Tr:41(<>%/4<>$N+(p8< *:!w<J346u1*/4q/ 6
N#< (@*$%R0@(F1T0< "/4:
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# iki 6 D l45*
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A< 0
Bq
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LN< "$%/4=<> T< "$%,
(A− < A >)(B− < B >) ' 0 a DA &om
AB = A < B > +B < A > − < A >< B > .a DA +o
[H< *$%,M5< "S(1$%*J< FW5/4FT.< 0''N[^]_Z` K"/D0F&,G.< Q+:@1@5$/ @5#W/4F$7D1"MFW(S/ 6F< 6u1*/4< "$O,<>5"C< &,;< (< ($*(/4t@,D@")AS ;*J< *J< Q+# d0=< :4/4< $%IJ<>%/4#(/D*'< R ;<J34;/4$%,E/4"C< &,&8$*(/4q@.<> AUD/B V@1@G""'%IC%(: ,4A> (1$%B/4FT.< 0V6u(< " /4(Q< (^< "< /4 #(/3D00F+,VLN< (@(98pP/+*.Q;< ##(/JHT"C<>/4 A
?5$$%1@(<>ZLN< (@(98pP/D*.Q< ##(/&< *.C/4N9H< "#$S/ 6 He
<>/4")AB/G0/MD 7@.< (@wF+,C$*:'< wi(r)
@1@ / Jp8$Q N@.<>w6u/4(7L5<>/4"
Ψσ(r) = (α3/π)1/2 exp(−αr)χσS(
αRX*%34R&3&(V(< 01
/ 6B@.<>A)/ (ww/4(0"#$@w(=< $Xr$0/4#W(<>/4(/ 6B76u/4("
Ψ(r) = Ψ↑(r)a↑ +Ψ↓(r)a↓,a DA 4o
S(aσ
C< $=<%/4t/4#W(.<./ (;/ 6V#< (@*$!td@.<>Ψσ(r)
AwLN< "$%/4=<>!!M*/40+1< &IJ<>/4)6u/4(55p />8$"&ZF< Z< N76u/4("
H = εa(n↑ + n↓) + Un↑n↓,a DA &o
S(n↑ = a†↑a↑
S(J<
εa = 〈Ψσ|H1|Ψσ〉,a DA "$4o
< 0U = 〈ΨσΨσ|V |ΨσΨσ〉,
a DA &o< (7"C<>(OH$"&S/ 6B:4$.8#< (@.%*$%Z#< (@50r0\<
H1 = −~2
2m∇21 −
~2
2m∇22 −
2e2
κ0r1− 2e2
κ0r2
a.u.≡ −∇21 −∇2
2 −4
r1− 4
r2
a DA !&o< 0)/ 6BR /41$/4"MF;+(< */4;Fp !$*(/4
V =e2
κ0|r1 − r2|a.u.≡ 2
|r1 − r2|,
a DA &oS%2\*/4((#/40:q0r%/4Ct<>/4"*1%dal<TA 1 A o<>6k(\*/40+1< $%p,M:4 A&5/4$%,G:4&3 < $1S/ 6^a DA &o^/4FT.< 0'6u/4(K5@.<>
a†↑a†↓|0 >< 0d
E = 2εa + UAXN/ .< $(: ,\5""'%I0!S%\(#W*/
α
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# /G/4FT.< Z $$O8Q+/S3 < (=<>/4< $@"C<> "$ / 6BFW/
α< 0;7:4(/410
@.<>^(: ,EG
AL5/ 34(w^"C<J,Z$/D/4QZ<>^#(/4F$"0%X(+$%,4AJ_NUr$0/4#(<>/4(*J< FWU0r0V6u/4(< V< (F%(< (@,NF< ^"C<J,N(:&< (07U:4+3>< $1
E< <w6u1*9.%/4< $4/ 6Ψσ(r)
J*UK6u1*/4< (K10(U+:4(< $ 9HT#(/4A(6u/4( 4w(1w<J3&6u1*/4GU/4FT.< 0G6u(/4"S[U1$(U+1<>/4G6u/4(6u1*/4< $ 10(U#(/3D/<>.Kw<34U6u1*/4/4("C< $%I0 A"J< <> V"%"%IN76u1*/4< $
EΨσ(r) =∑
σ
∫
d3rΨ∗σ(r)H1(r)Ψσ(r)+1
2
∑
σ
∫
d3rd3r′|Ψσ(r)|2V12(r−r′)|Ψσ(r)|2.a DA o
CX*J+Z[U1$( [UA a DA &oK.< Q 5S6u/4(" / 6XN1(@(*0;LN< (@(98pP/+*.Q+1<>/46u/4(
Ψσ(r)< "$%,
(
∇2 − 2e2
κ0r
)
Ψσ(r) + Ψσ(r)
∫
d2r′e2
κ0|r− r′| |Ψσ(r′)|2 = λΨσ(r),
a DA 4oS(
λ(*^"#/40/4("C< $%IJ<>%/4Z6u1*/4Z^< "^"< (<
/4(:4%< $XD*.(D0:4( 6u/4("M1$=<>%/ C/ 6N<J347+1<>/4 nATY6 Z /41$0<34.< Q 'p /#D8/4(F%.< $%K@J< 0/ 6W /V/4(F%.< $%w /41$0'/4FT.< MS(@(*0LN< (@(98pP/+*9QG+1<>/4 A++1 N*J< 5<>.< Q+%:R'N"#$%@*J< ^@1@ /'#/4(F%.< $w7/4FT.< ;%(w $$O8Q+/S;3>< (=<>/4< $W@"C<> "$ 6u/4(
α< 0EG
6u/4(wL57<>/4" α = 27/(16a0)
<>0EG = −5.695Ry
DS(a0 ' 0.53 JR` /4(V/4(F%V(< 01AC(:4R#(&GV*J< < (/Sq
P:A DA DA
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0 1 2 3 4-8
-6
-4
-2
0
2
4 He atom
U
EG
2εa
Ene
rgy
(Ry)
Inverse orbital size, αa0
P:41( DA DAU!&(#$=<J,Fp 2!<>/4"*;(: ,εaau0/ 02$oM< 0
+(< */4\(: ,Uau0< 0$o5(1$%:\G:4(/410@.<>G(: ,
EGau/4$0;$o < 5<M6u1*/4/ 67+34(/4(F%.< $ IαA
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:4$*0?@.<>V11< $$%,d(#(&M:4$%,\9HT*%0 al< 0E+1V:4$:48F$o@.<>'S@,D@")A+,C< (S1##W/40/VFW5< $"/4@^1/+**1#0< 0/(5*/4&(F1T/4):4$:4%F$% A% ZF&3D/41$%,401V/R&(< */4R0&%,/ 6Z:4$%N#< (@*$"C<,'FW*/4"ZF$1((0%6 Z&(< */4C @(/4:4( < 0%X(*(: ,6u/4(1*9):4$98#< (@*$Z@.<>A
<>K/ ("C<>"C<>*J< $&#(/4#W(@/41$0R (01*0'F< K9HT#W/4 YU34(@,G*/4&34+U/7#(@6u/4(" < $$+*J< $*1$=<>%/41:< G/4(@/4/4("C< $%I0
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.
F< SJA <>S< ##W5%6%S/ *J< VV/+**1#<>/4D1"MFW(S/ 6<!:4%34q:4$#< (@*$@.<>
iV:4/3&(0F&,EC*(J<>/4< 0< $<>%/4
/4#W(<>/4(ai< 0
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Ψ(r)< 0
Ψ†(r)A]N1G/ < 1$
#(*#$;6u("/4*Cw<346u1*/4-< '/EF!< &@,D""(* AKL5*)r$0)/4#(<>/4(S/41$0<34776u/4$$/S%:'< &*/4""M1T.<>%/4($=<>/4
Ψ†(r), Ψ(r′)
= δ(r− r′),alTA o
S( A,B ≡ AB +BAA!< 00%/4/'<>J%6F/ )/4#W(<>/4(5< (7*/4>@1D8
:&<>0C/4(/ J&,C< &.%*/4""M1T A Z5*/41$0C9HT#*w5*(J<>/4< 0< $=<>%/ /4#(<>/4(/5F<34 V<S"$< ( "C< (A>D1*.M*/4""G1T.<>%/4($=<8/4$^5#< (@*$^:4$S#< (@*$S@.<>FW<J3&N$Q S(J< $6u("/4A&_N$/"#$)*/4""M1T.<>%/4(1$C"#$%,-<?"C< $$('+1"MFW(C/ 67("C%2\< *1< $*J< $*1$=<>/4M&3&/4$O3D:\")AU_ #< (M/ 6Z*(J<>/ 2< 0< $=<>%/ /4#W(<>/4(< *:'/4)<
N8#< (@*$Z@.<>:4%34
aja†i |w1 . . . wN >= aj|wi, w1 . . . wN >=
< wj|wi > |w1 . . . wN > +N∑
k=1
(−1)k < wj|wk > |wi, w1 . . . 6 wk . . . wN >,
alTA 4oS( 6 wk
/S<>7#< (@*$M0*(FW0EF+,wk
7/ V$/4:4(7#(&R"C< &,&8#< (@.%*$Z@.<> A&34(@0)/4(0( V<J34
a†iaj|w1 . . . wN >=N∑
k=1
(−1)k < wj|wk > a†i |w1 . . . 6 wk . . . wN >=
N∑
k=1
(−1)k < wj|wk > |wi, w1 . . . 6 wk . . . wN > .alTA 4o
V1" / 6K< FW/3&V[U+ABanDA 4ow< 0qalTA &o :4%34S17w< +0)*/4""M1T.<>/4(
a†i , aj
=< wi|wj >=
∫
d3rwi(r)?wj(r) = Sij.
alTA +o
C&:4(< $U/3&($=< #E&:4(< $UFWwqC/ (FO9<>$wi
< 0wjAE
< "7"C< (Dw7*J< /4FT.< 7(1$%w6u/4( p /'*(J<>/4;/4( p /< $<>%/4/4#W(<>/4( < "$%, ai, aj = a†i , a†j = 0
AD/+N6u("/4%*N< &*/4""M1T.<>%/4(1$5< (7#((@3&0!/4$%,C6u/4(/4(@/4/4("C< $XF< SS(
Sij ≡ δijA
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"$Y6ME:4$d#< (@*$dF< )/ !/ ("< $I0 E#< (@*$*/41&
*J< / MFW0("0q1:!11< $ +1"MFW(R/ 6S#< (@*$R/4#(<>/4(a†a
AY6a†i , ai =< wi|wi >= Sii
< wi|a†iai|wi >=< wi|Sii − aia†i |wi >= Sii < wi|wi >= S2ii
S<>^U+1< $//4/4$%,M%6Sii = 1
A&s5/ w<>U3>< $1/ 6Sii
K/4:&<>%34 FW*J< 1C/3&($=< #?&:4(< $^&3&/4$%34R/4$%,/4C/4(F%.< $n *
Sii*< / MFW
+1< $ / −1 A_N/ (N#(/4F$" 0/C0*1ZSV*/4*/4\FW9p \R*/4"#$/ 6:4$#< (@*$F< G< 0?;< +*/4""M1T.<%/4?($=<>/46u/4(VCr$0/4#(<>/4(JA[HT#< 0:C< &*/4""M1T.<>/ (7< **/4(0:;/)0r%/4a DA &o9 /4FT.<
Ψ†(r), Ψ(r′)
=∑
ij
w?i (r)wj(r
′)
a†i , aj
=∑
ij
w?i (r)wi(r
′)Sij =∑
i
w?i (r)wi(r
′),
alTA 4oS(d(0 +1< $%,t"#$%< /4(@/4/4("C< $ZF< ;JASE(1$%.< &9HT#(/4R*J< VFW^0+%r0V< +1%3 < $&/S^0r%/4/ 6T^*/4"#$/ 6K<G wi(r) ∑
i
w?i (r)wi(r
′) = δ(r− r′).alTA &o
D/q%6Z\F< C/ */4"#$ ^ \0/q/ <J3&!!*/4((*;*/4""M1T.<>/ (1$'6u/4(Gr$0/4#W(<>/4(0r0tF&,2[UANalTA 4oau)< "G(1)6u/4(< Tr%CF1TG/4/4(@/4:4/4< $F< .oAK` *< 1; w/ (QS%-<!r%CF< "C<J,!< ##(/JHT"C<>M(1$N/4$%,)\<C$"'%0!(:4/4!/ 6^#< * AX<>7SS+,%"#W/4(@.< &^/R*./D/45NF< 6u1*/4^/R*/3&( $$Z< (J<T&S(N 9HT#*7< )< "#$7< F10< *V/ 6$*(/4A
P/4($%:4+R<>/4"R< 0q/4V0*10-EMD*/4q%RC3D*%,/ 6 C+1*$n S(C C9HT#*M$*(/4R#(3>< $n<>R$J< @R< R$/4:)< V < ('%+(@0Ed(7FW/410E@.<>AY6 '$*0E@.< (@.%:;w<34'6u1*/4*/4*0'%?@.<>M/ 6wC%+(< *:)@,D@")?< ##(/JHT"C<>/ /4(Q+34(@,' $$nA45r(@ *./4*/V0("5*$=< / 6 F< U6u1*/4U/@.< (@wS%<M/4$%3 < F$N1F5/ 67@,D@")A;7*J< 7/ 6<>/4"w< 0/4D ":4&50(/4#!r(NR+(< */4)FWwd$*(/4AXNN/4$%,;M@.< (@:"/4"&/ 67$*:?!O.< $w*$=< C/ 6Zw<34)6u1*/4A^?)+1/ FT9<>t<:4$G#< (@*$D*.(D0:4(+1<>/4E0*(F:)< ?$%*(/4?d /41$/4"MFr$0'/ 6S+1*$1A&_NKS/4$1T/4Rw/4FT.< M $$Q+/S+,D0(/4:4*98$%Q4w<J3&76u1*/4A
_N'"&/40-FW6u/4( K ; /41$0-$Q //4#T"%IC" $=<>(M/E< **/41&FW9(R&(< */4AKD/B <34C/d0*0?S*.qw<J,?/!3 < (@,E")A Z^":4&9HT#*<>B01^/S^(#1$%34 /41$/4"GF&(< */4^/4(F%.< $
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.
*J< qFC%(V.HT#< 00/4 /\< $$/C$*(/4/!F6u1(@(R<J<J,d6u(/4"J< *9?/ (/4(7/)*/4&(< (@,4/)FW+1IJ0 /.< Q C< 0T3>< +.< :4/ 6D1*$1G<>(< */4 ABq"#$@G< 0#&,D*J< $$%,?< ##W< $:d< ##(/&< *. C(< 0=< $UI/ 6w/4(F%.< $7"C<,dFW'3 < (0 A ZEC/ (V< 0 / .< $< :41$=< ("/4"+1" / 6T$*(/4B <>/4" /41$0VFW&3 < (=< &10(B$*(/4D8$*(/4&(< */4J/S ^"C<J,N(@,Z/S(.< 7< :41$=< ( 0#0*JE%/4(: < $B6u/4(")< %0/DV/ V*.< :40(< @*J< $$%,\10('+(< */4ak)#D8/4(F%'&(< */4-'(:&< (00t< '"C< $$w/4-'(: ,*J< $o9AUI5*.< :4N/ 6 0%X(& /4(F%.< $%U0/D/ *< (@,C<J345/VFW5($=<>0'/VJ< *./ (Aw[K3&(@,t:4$!/4(F%.< $S*J< <J3&d<?6u(\#< (< "(C@J< 0 / 6%` /4((< 01
na0A&5*$=< ^/ 6 &,D0(/4:4*98$Q ww<J3&S6u1*/4^KD1^0r0F&,G
(< 0=< $ #< (@/ 6B76u/4("
R1s(r;α) = 2α3/2 exp(−αr),
R2s(r;α) = 2α3/2(1− αr) exp(−αr),
R2p(r;α) =2√3α5/2r exp(−αr). alTA $4o
;*/4"#$Cw<J3&6u1*/4G< (/4FT.< 0F&,q"M1$%%#$%,D%:);(< 0=< $#< (@F+,\@.< 0< (0t#(*J< $N0#W0*(#(&0 F&,2#(*J< $N< ("/4*Ylm
nA A
φ1s(r, θ, φ;α1) = R1s(r;α1)Y00(θ, φ),
φ2s(r, θ, φ;α2) = R2s(r;α2)Y00(θ, φ),
φ2p0,±1(r, θ, φ;α3,4,5) = R2p(r;α3,4,5)Y10,±1(θ, φ).alTA &o
C< FW/34G6u1*/476u/4(" <:4(/41#/ 6<J34'6u1*/40#0+R/4#< (< "(
αiS*9)< SV0"/4/ 6K&34(R$: AP/4(V&,D0(/4:4
<>/4")D#< (< "(< 5<MrTHT0)3>< $116u/4( JS@.<>Cal<>/4"%*Z1%.ow< 0
1/26u/4(NG("C< :C&,D0(/4:4*98$Q M@.<>a >7< 0># T± oJAX7#< (< "(*/4((#W/40G/\I;/ 6S/4(F%.< $nA(M+34(;R;` /4(p8(< 01R6u/4(J< *9d/4(F%.< $lA ZM*J< \*J< $*1$=<>VM9HT#*.<>/4\3 < $1R/ 6UM0@.< *M/ 6U$*(/46u(/4" +1*$nTS*.)
< φi|r|φi >=∫
d3r|φi(r;α)|2r =
32α
6u/4( JS@.<>3α
6u/4( ># T± @.<> . alTA !&o
?< $$ <>M/4#T"%I0-` /4(p8(< 0 < (/ G9H< *$%,+1< $w/\/43 < $1A
;)' !"# 3 #*= != )*.H$2*3 &()*# *!= )*. .# # :OO# *3 = 9 P "# $2EA # +P :J.")CG:.%!"#>'#. A !1. )E !1$2= *#3M= * 9-#&;!= )* +P = *!# ', . )24 !"#8)"'$ '1$3 = = GH"=?&1"$2'# !"# = * # '1.#%)24
αi
O$2'1$2,D#(!# '1. P
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!
0 1 2 3 4-1.0
-0.8
-0.6
-0.4
-0.2
0.0
0.2
0.4
α2a
0=1
over
lap,
S
parameter of 1s state, α1a
0
P:41(TA 4A N34($=< #+:4(< $FW /4("C< $%I0 JG< 0 >M+,D0(/4:4*98$%Q4w<J3&N6u1*/4ADZIZ#< (< "(6u/4(^ > @.<>Z Q #TwrTHT0)<> 53 < $1α2 = 1
A
;$*0q6u1*/4G< (C/4("C< $%I0 BF1TM,q< (/ M/4(@./ :4/4< $^6u/4(< ;< (F%(< (@,G3 < $1N/ 6Z#< (< "(
αAD,;< (5Z/4$1T/4/ 67LN< "$8
/4=< / 6< E$*(/4E /41$/4"MF#W/ &=< $U/ 6D1*$1AB_N0D1V%6,G<J34S0%X(&^(:44,'< (/4(@/4:4/4< $T/4$%,R6u/4(U<7:4$ 3 < $1/ 6#< (< "(A&?N0/M/ w*.< :45.Z< :41$=< (^0#W0*7/ 65w<J3&N6u1*/4F1TG/4$%,(< 0=< $#< (@JAUD/\/4$%,EC6u1*/4M*/4((#/40:\/\< "#(*J< $< ("/4*G"C<J,qFW/4/4(@/4:4/4< $nAB/41(G*J< US%@.< (@:F< alTA &o9< (/4$%, JG< 0q >M@.<>A Z*J< -*J< $*1$=<>/34($=< #+:4(< $W6u/4(wV@.<>N< 0/4FT.< ;<>
S =< φ1s|φ2s >=∫
d3rφ?1s(r;α1)φ2s(r;α2) =8√
α31 (α1 − 2α2)√
α32(α1 + α2)
4 .alTA &o
Z$%,6u/4(3 < $15/ 6α1
< 0α2
<>@6k,D:GR+1< $%%p,α1 = 2α2
R< FW/34/34($=< #'&:4(< $TU+1< $/7I(/A&U$wM
(α1α2)
#$=< */4((#/40^/<M0%X(&@(: / 6 /41$/4"MF;<>(< */4/ 6ZD1*$1AP:ADTA 7/S
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.
U0#W0*53DAα16u/4(^<ZrTHT0'3 < $1/ 6
α2 = 1A4 IS/ 6 JU/4(F%.< $
"C< $$%(Naα1 > 2
o9+N:4C/ 6N/3&($< ##W/4%%34 A+Yw :&<>%34N5/4##W/4%S*J< A+5$"O
α1 → 0"J< < Tr%/4(F%.< $IN< 0*J< CFW
(:&< (00E< ZM6u(98$*(/4d$"O56u/4(NG:4%34@.<> A` *J< 1G G/4#T"%IV#< (< "(S< 0)(+1(7<>SF< <J346u1*/45< (/4(@/4:4/4< $X6u/4(< +,G/ 6X3>< $1^/ 6W5#< (< "(
αi 5<J3&/+(/+01*5<#(/+*01( &<>
:41< (< +7A/4(@/4/4("C< $R/ 6 F< 7<J34'6u1*/4*J< EFW'*J< $$05/ 6Bq< (w6u1*/4
wiA@(< :4&6u/4(@< (0w<J,/< *934%F+,
"OHT:)p /d/4/4(@/4:4/4< $/4(F%.< $A;/4(@/4:4/4< $O,E($=<>/4E/d< $$/ (GF< R6u1*/4GM#((@3402F&,?;/4+(%3D=< $ < :41$=<>(M0#0*J)/ 6*/4((#W/40:'w<J346u1*/4A
?<J347p /'6u1*/4φ1< 0
φ2<>@6k,D:'($=<>/
< φ1s|φ1s >=< φ2s|φ2s >= 1; < φ1s|φ2s >= S,alTA o
< 0!wV /41$0\$Q //4FT.< M/4(@/4:4/4< $%I0)6u1*/4w1
< 0w2S*.
<>@6k,< w1|w1 >=< w2|w2 >= 1; < w1|w2 >= 0.
alTA 4oD1*9?<(< @6u/4("C<>/ d7/ 1+1 AsN< "$%,4Ww'"C<J,\*./D/4GG6u/4$$/S%:6u/4("
w1(r, θ, φ;α1, α2) = βφ1s(r, θ, φ;α1) + γφ2s(r, θ, φ;α2),w2(r, θ, φ;α1, α2) = γφ1s(r, θ, φ;α1) + βφ2s(r, θ, φ;α2).
alTA &oY7< < <>I'< 0<#W*=< $K*J< G/ 6 <:4(< $K"/+0 W&' ikh/Cj m- 0*(FW0\_N##W0OHd`NAX_NZM/4$1T/4\/>6ZalTA o5< 0alTA 4o G/4FT.< \*J<
β =√1−S+
√1+S
2√1−S2
,
γ =√1−S−
√1+S
2√1−S2
.
alTA +o"OHT:\*/+ *+
β< 0
γ< (0#$=<,40--P:ATA \< <!6u1*/4/ 6
α1AV*9/ *V/ 6"OHT:G6u/4(" alTA &o < SV< 0T3 < &.< :4V/ 6#((@3D:
"C<@/4(R< #*G/ 6w< #W/ 6wCw<J3&C6u1*9.%/41*.-< V+1"MFW(/ 6/D0J< V/Sq?P:ATA DAVV16u1$FW*J< 1w"C<,d@$$U0D8%6k,'Z#(/4#W(@w/ 6Nq< (6u1*/4w< w"$< (U/MZ/4(:4%< $W<>/4"*6u1*/4A)/4@S"#W/4(@.< &$O,4+7/4(@/4:4/4< $%I06u1*/4
w1< 0
w2(01*
/G.<>/4"*Z/4(F%.< $φ1< 0
φ2;V<>/4"%*Z$"O
α2 = 2α1A
_N"&/40FW6u/4( DNr%NF< w*9/ *Z"C< Q4w% */4"#$w*/4D80%/4MF< KF(J< QR0/S A43&(%,M/ 6KF(J< Q+0/S*J< 'FS< **/41&0'6u/4(R("/ 6%0r%/4 ∑
iw?i (r)wi(r
′) = δ(r−r′)A?w*J< G*J< $*1$=<>^w1"
/4;$6kw/' /GS<>S9HD&N%0/D5< ##(/JHT"C<>NZ(980"/4< $]N(< *M0$%.<C6u1*/4
δ(r − r′)AXB/;3D1< $IV7< ##(/&< *. %Z7< 0T3D< F$V/
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0 1 2 3 4
0.00
0.25
0.50
0.75
1.00
1.25
1.50α
2a
0=1
γ
β
mix
ing
coef
ficie
nts
parameter of 1s state, α1a
0
P:41(NTA +A)OHT:R*/+ *+β< 0
γ< w<V6u1*/4C/ 6N&34( Jp8/4(F%.< $
Iα1AB+34( >p8/4(F%.< $^ICVrTHT0-<>
α2 = 1AB< (J<)S(C
/4(@/4:4/4< $%IJ<>%/4E#(/D*01(V*.< (@,4K*J< qFWC AK` / q$"Oα1 → 0< 0
α1 →∞ 0/'/ 5(+1(%JA
(01*VVD1"MF(5/ 6U*/4"#/4+S/CFM< F$7/0#$=<,3 < $1/4\<#$/ JA?0rZ6u1*/4
C(r, r′) =1
4π
∫ π
0
∫ 2π
0
dφdθ∑
i
w?i (r, θ, φ)wi(r
′, θ, φ),alTA 4o
ES*.q ;< (<34(< :4:!/ 6C*/4"#$M*/40%/4?/3&(R;< :4$θ< 0
φAYN5#$/>0)!P:ATA 6u/4(R<>/4"*7F< 5$*0 AXP/4(5<'*/4"#$
F< G )/41$0/4FT.< <δ8$Q ;#WJ< Q-< $/4:d$
r = r′AU):4&/ 6
7#WJ< Q"J< 1(7(#(&.<>/4)/ 6<G:4%34(:4/4;F+,CF< AP/4( 0J< $*J< SS:4+^^/4F+3D/41$%,MTr%5< 0+1< $W< $/4:7SS/4$S$ A4($=<>%34VS0Td/ 6UM#WJ< Q!/SZM#<>=< $(/4$1T/ \/ 6^M$*0F< !G(< 0=< $B0(*/4 AWY7*J< FG<>N'< (J<*$/4R/;+1*$17ZFW@(#(&0!MF< AWM6u1*/4N0*J<J,\9HT#/4+=< $$O,))M$=< (:4
r$"'OJAS*9/4*/ 6W&,D0(/ :4*98$Q4 w<J34S6u1*/4U< ^< $//4"'0< 0T3 < D8
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.
0 1 2 3 4 50.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
wav
e fu
nctio
n de
nsity
radius r/a0
P:41( TA TA><>/4"%* JK< 0 >/4(F%.< $ au0< 0G$.o 3DA> */4((#W/40:/4(@/4:4/4< $%I0qak?< (.ow/4(F%.< $au/ $0$.o9AVI/ 6KF/ \<>/4"%*< 0q< (/4(F%.< $U < 0>@1@0/4C9H< "#$S/ 6 ZL5N<>/4")&F&,*J< ((@,D:R/41T*/4"#$![^]S_Z` '#(/+*01( A _ $=< (:4($/+*J< $%IJ<>%/4/ 67)q< %(C/4(F%.< $< (/410+1*$1S A
.< :4A,)< (V/4"S<>50*1$%/< 0$)< *1< $*< $*1$=<>/4F*J< 1M&:4(< $5&34/4$%3D:'" < (R0*1$%N/4(N34 !"C< &,)*J< X"#W/4F$/dFW*J< $*1$=<>0-< < $%,+*J<>$$O,4AKD1*.-&:4(< $M< ##WJ< (M?;"*(/4*/4#*C#<8(< "(
tij< 0
Vijkl< S9HT#(0\F&,[U+Aa DA 4ow< 0qa DA &o9A
_N/ ( #W/4F$O,'^/M1N < 1=< p,D#Z/4(F%.< $> 4 D D X/ 676u/4("
ψ(r) =
(2Γ2
π
)3/4
e−Γ2r2
,
6u/4(Z'@.< (@:;F< 7JAY7< 0/4G nAP(/4" G#W/4&/ 6^3D / 6*J< $*1$=<>/45"$%347%ZZ"M1*9dJ< (N/;#(/D*0 A ,d<J34G"G1*.d*(+:4(< $B#(/4#W(@7< 0\G#(/D*7/ 60(":CG"%*(/4*/4#*R#< (< "98(K0/D/ K#(&^<N#(*#< $+0*1$%, nA>K< $$/S6u/4(< G< 1T/4"C<>*J< $9HD/4)/ 67*J< $*1$=<>%/4/'$=< (:4( @,D@"AL5/w34( < 1=< 6u1*98/4< (S/4$1T/4'/ 6XS< ("/4*98/4*$%$<>/ (K#(/4F$")A+!<>*9:7")&F+,
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4
02
46
8
r/a00
2
4
6
8
r /’a0-0.250
0.250.5
02
46
8
r/a0P:41(^TA A^6u1*/4
C(r, r′)/ 6[UATalTA 4oX*.< (< *(I:*/4"#$
*/40%/4alTA &o9 <34(< :40E/34(7< :4$θ< 0
φ/ 6Gw<J3&G6u1*/4Z6u/4(J >T< 0 ># T± N/4(F%.< $A&N#$=<>J< 1< (/410N/4(:4'*J< 10;F&,< d< (@%r*=< $*1T/ E/< **/4""/D0<>V#%Q4M<>1(M/ 6UM0#0*J A _N$$
6u1*/4710Ed*J< $*1$=<>%/4\<J3&MG.<>"M3 < $1α1...5 = 1
A G*9< :4G/ 6#< (< "(*J< $#$/ JDS%/41TS*9< :4:'%< # A
"%"%I%:\;:4$;$*(/4-(: ,/ 6Z<d$J< (M*/4"MF<>/4q/ 6 < 1=< 6u1*/4T6u/4($*(/4"/3D:GR /41$/4"MF;#W/ &=< $nT*J< FW(:&< (00)< <R"C<>"C<>%*J< $l+(<>(< #+,D*J< $nT< ##(/JHT"C<>%/4 AD` *J< 1N.N< ("/4*/4*$$=</4(M#W/ &=< $'1+FW/41002S%-)*(J< :0@.< * U)w<J3&6u1*/4< (!0< "#0t9HT#W/4&=< $$%,S%
r+1< (0 /?w!"C<,< $/?"
$/4:>8(< :4 */4(($=<>/4A4 % j v m v ~ikjY z < (S<7FW(< ##(/JHT"C<>/4M/ 6W:4$N#< (@*$N6u1*/4w<>/4"*N@,D@"< ; < 1=< 6u1*/4A` 98*J< 1S/ 6WK S<J34S$*0'ND$=<>(K/4(F%.< $KMS("C< %:Z#< (@^/ 6WA
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.
54 N 2" ( 8">2 ' $ d`L4% #" $M*./4*V/ 6KR*$=< 5/ 6KVF< 56u1*/45Sr(@Z@# AXs59HDNwR<J34/G9HT#(S9HT#$*%$%,'7LN< "$O/4< a DA o/4(0( ./M0=< :4/4< $%IN%JAD/M 0/!.< *.Q+$CC#(/4F$"/ 6S*J< $*1$=<.%:)/ 98$*(/4 a DA 4o< 0qw/>8$*(/4!#< (< "(a DA &o9AV*J< $*1$=<>/4*J< !FWV#W(@6u/4("0!R<>/4"*F< A>` *J< 1 w< &B/5 /4(Q7S%V/4(@/4/4("C< $4?< (6u1*/4 <J34/G.(< @6u/4(" #< (< "(w6u(/4" <>/4"%*N/'7?< (S(#(&.<>/4 A
0 /1&3 '( 4+-5-2" ! Z1("/D0$K0*(FWV$*(/4/ 6 *9< (:4 −e "/3D:dGr$0/4(:4<>%:6u(/4" N+1*$1S%C*.< (:4
ZeA+N*.< (:4N/ 6XN+1*$1 0/D / <J345/
FW'VE< 0T3>< *C< Z 'w< &/*J< $*1$=<>M34(< $^0%X(&R<>/4"7< 0E/ JA7:4$5#< (@*$5#< (@w/ 67LN< "$O/4< \a DA o^*/4@w/ 6ZQ+*5("< 0+1*$J< (N / 1$/4"GF(")TS*.)(J< 0S)<>/4"*Z1%
H1(r) = −∇2 − 2Z
|r| .alTA &o
SLN< "$O/4< R9HT#(J0M<>/4"*1% nA Aw0@.< *wK"J< 1(0G51%^/ 6` /4(^(.<>01
a04.S*9< (:4S1%^/ 6 $*(/4*S*.< (:4
e< 0
(: , ,D0FW(:RyA&?Sw< &/V0("S59HT#(/4C6u/4(U5/4##:
+:4(< $X;V<>/4"*'a ≡ #("0o(#(+.<>/4
t′ij ≡∫
d3rφ?i (r)H1(r)φj(r).alTA $4o
_S**/4(0:\//4(:4%q/ 6N/41(MF< M)<>/4"%*C6u1*/4 φi$*02< (
/4$1T/4S/CNLN< "$O/4< A_NZ@.<>0\FW6u/4(R/4$%,;φ1 ≡ φ1s
< 0φ2 ≡
φ2s< (d/ /4(@/4:4/4< $nA ` *J< 1E/ 66l< *)< $$N/ 80=< :4/ < $S(";
<>/4"*au#("0o(#(&.<>/4C/ 6t′ij&9HT*#Tw/ 6
t′12+< (SI(/ADD/wS<345/4$%,\/4+1%3 < $&'/4I(/d("M$6kG/41TM6u(/4" / .< $ / 6 DAB?;"C<J,q< $/
/ 7<>S@.<>φ2< 0
φ3,4,5 ≡ φ2p0,+1,−1
*/4((#/40)./G< "(: ,:4+3>< $15/ 6ZLN< "$O/4< ADD/&56u/4(" / 6
t′11 . . . t′55
0&*J< $nA4EZ/4$%,<34 /7(@U0%X(&U#< (< "(
α2 . . . α5A K/4F(@3 <>/4M(01*U6u1(@(
G+1"MFW(Z/ 60%X(&7&:4(< $5/;*J< $*1$=<>V/TAX_5$$/4(F%.< $N< (M*&.(0< (/410).V< "V/4(:4 AR3 < $1<>/4)/ 6.R&:4(< $S5@(< :4&6u/4(@w< (0;#(*J< $*/D/4(0<>A/4I(/$"+/ 6
t′ij< (
ε′1 ≡ t′11 = (α1 − 2Z)α1ε′2,3,4,5 ≡ t′22,33,44,55 = (α2,3,4,5 − Z)α2,3,4,5
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8 .
t′12 =8 (α1 α2)
32 (α1α2(2α1 − α2) + Z(α22 − α21))
(α1 + α2)4
alTA &oLN<J3D:/4FT.< 0 E(1$%! ?<>/4"*dF< ?<J3&/(< @6u/4(" %/-E/4(@/4:4/4< $%I0 F< )< **/4(0:-/t[U+AMalTA &o;<>0 alTA +o9AS` *J< 1tij =< wi|H1|wj >
< 0)V0*/4"#/4%/4qalTA &o9V*/4((#W/40%:C9HT#(p8/4w(< @6u/4("0;/'V<>/4"%*ZF< S<J3476u/4$%$/S:R6u/4("
ε1 = β2ε′1 + γ2ε′2 + 2βγt′12
ε2 = γ2ε′1 + β2ε′2 + 2βγt′12
t12 =(β2 + γ2
)t′12 + βγ (ε′1 + ε′2)
alTA !&oD1*.t<d*.< :4/ 6ZF< G+(/+01*GD1<d1F@.< +=< $w*9< :4;3>< $1/ 6#< (< "(G< MM/S-P:ATA )6u/4(V;+1*$1G*.< (:4
Z = 2
S(d0< 0 $\(#(&(1$%tE<>/4"%*\F< < 0 /4$0q$R6u/4(R;/4(@/4:4/4< $I0F< AKG#$%/ G/4$%,E.3>< $1;/ 6
α1*/4((#W/ 0:/G J5/ (FO9<>$ S*.< :4:GS$α2a0 = 1
6u/4(w >S/4(F%.< $S*.*/ ((#/40M/!C*J< ;/ 6D1*$< (M*.< (:4
2AP/4(VC+,D0(/4:4*98$%Q4
$"'Oα1a0 = 2
α2a0 = 1
C/4(@/4:4/4< $%I06u1*/4VF*/4"C0&*J< $K/C<>/4"*M6u1*/4Aw <>/4"%*'< 0Eq< (V#<>(.<>"(R< (+1< $;S$"OJA]N1/'R< :41$=< (0#W0*R/ 6 ># '@.<>,)0// "OH)S%dJ< *.E/ (7< 0dS%d7@.<>A (<>/4"%*R(: ,dZ+1< $/<>/4"*(: ,)6u/4(S >N@.<>M<>NR< "V3>< $1R/ 6^#< (< "(
αAXs5/ V<>
%:4'/ 6WS/4##:7#< (< "(t12
0/D^/ ^*< (@,'<34/FS< "< w<>S/ 6
t′12A Z;7/ (< 0 T:4;/ 6Bw#< (< "(0/+S/ S(J< $$%,
"C<>( 6u/4(S<G /$34$@,D@" *77:4+3>< $1S/ 6%SLN< "$O/4<
H =
(ε1 t12t12 ε2
)
<J3476u/4("
ε± =ε1 + ε22
±√(ε1 − ε22
)2
+ t212,
S*.)/4F&3D/41$%,0#W0&56u(/4" :4/ 6tA
00 ' /1&3 '( 4-5 -2" !Np />8#< (@*$5#< (< "(w< (Z0r0;F+,[UAa DA &o9ADL5< "$%/ =< /4#D8(<>/4(< 76u/4(" / 6BR /41$/4"MF(#1$%34&(< */4
H2(r, r′) = H2(|r− r′|) = 2
|r− r′| .alTA &o
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.
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
-4
-3
-2
-1
0
1
atomic basis
α2a
0 =1
ε'1
ε1
ε'2
ε2
t12
t'12
sing
le p
artic
le p
aram
eter
s
parameter of 1s state, αa0
P:41(\TA DA d:4$!#< (@*$)#< (< "(/ 6 J< 0 >/4(F%.< $A^*9< (:4)/ 6Z!+1*$1C
Z = 2A ]Z< 0t$(#(&)(1$O.
<>/4"*wF< ADD/4$%0G$K6u/4(Kq<>(^F< A4_N$$#< (< "(^.HT*#Tw/ 6WJα< (7rTHT0!<>S73>< $1
1At12
8(0)$ ε18F$1$
ε28 : (!$ A
?w< &5/0("Zr(@573 < $1S/ 6K#< (< "(S;.V<>/4"*'au#("0o(#(+.<>/4
V ′ijkl ≡∫
d3rd3r′φ?i (r)φ?j(r
′)2
|r− r′|φk(r)φl(r′),
alTA oS(CC<>/4"*M6u1*/4
φi(r)< (/ 6 6u/4(" alTA &o9A_N$$U6u1*/4
< (V*+(0<>(/ 10d<'*/4""/4)/4(:4?au+1*$1N#W/4%/46u/4(M<>/4".o9A*/4""/4\/4(:4\< $$/S56u/4(7< < < $%,+*R3>< $1<>/4\/ 6 < $$B&:4(< $GalTA o9AW0*1$%S#< (@Sw9HT#(/4)6u/4(w&3&(($=<>%3470@.< *7/ 6K$*(/4
1
|r− r′| =1
√
(rx − r′x)2 + (ry − r′y)
2 + (rz − r′z)2.
9HT#(/4/ $Q4$%,&:4(< F$ w< (@=< */+/4(0<>AVD/ <34/'1V#(*J< $#W/4$=< (*/+/4(0<>5< 0"G1$%%#W/4$%Z9HT#< /4qanNA &op/ 6
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8 . -$
1/|r − r′| < ##(/4#(=<>V//4G*/D/4(0<>WS*.N"/4(M*$/4$%,!0*(F0_N##0OH\N
1
|r− r′| =∞∑
s=0
s∑
m=−s
(s− |m|)!(s+ |m|)!
rs<rs+1>
P |m|s (cos θ)P |m|s (cos θ′)eım(φ−φ′).
alTA 4oL5(CC*/4((#W/40:\*/D/4(0<>R/ 6w#W/4&
r< 0
r′< (
(r, θ, φ)< 0
(r′, θ′, φ′)(#W*%34$%,4S(
r< 0
r′< (V0@.< *56u(/4" V/4(:4
θ
7#W/4$=< (< :4$N6u(/4" 7I98p<HTwS%0 ≤ θ ≤ π
< 0φw< I"M1T< $ < :4$
M HD,&8#$=< w6u(/4" H+8p<HTKS%0 ≤ φ ≤ 2π JA r< < 0 r> < ((#*%3&$%,5""R1" < 05"C<HT"M1" / 6 Sp /R0@.< *
r< 0
r′A+56u1*/4
Pmk (cos θ)
< ()d< /D*=<>0 :40(!6u1*/4A (@:[U+AalTA &o'< 0alTA 4o &/)alTA o V/4FT.<
V ′ijkl =
∫
d3rφ?i (r)φk(r)
∫
dr′Rj(r′)Rl(r
′)×
×∞∑
s=0
s∑
m=−s
(s− |m|)!(s+ |m|)!
rs<rs+1>
P |m|s (cos θ)×
×∫
dθ′ dφ′P |m|s (cos θ′)eım(φ−φ′)Y ?
j (θ′, φ′)Yl(θ
′, φ′)︸ ︷︷ ︸
(?)
.alTA &o
N#(*J< $X< ("/ *FW<J3&Z$%Q4Y (θ, φ)lm ∼ eımφ
ATL5*NN+:4(<>/ /34(
φ′/ 6'#< (@Ca
?oNE[UAalTA &oN$J<>07/)<;1F@.< &=< $U(01*/4/ 6
1"/34(m* ∫ 2π
0exp(ımφ′)dφ′ = 2πδm0
AsN< "$%,4(?)
R/4I(/d/4$%,6u/4(
m = mj − mlA Z;/ ('< 0 &:4(<>/4q/3&(M)< I"M1T< $
< :4$φ/ 6r(@M$*(/4q$J< 0V/\<)6u1(@(R*/4@(< &M/4q[UAalTA &oZ6u/4(
3>< $1m = mk −mi
AY6 R*/4"MFZwV/4FT.< ;6u/4$$/S%:'($=<>/ mi + mj = mk + ml
S*."J<>G<>G;/ .< $ I98*/4"#W/4&'/ 6Z< :41$=< ("/4"&1" / 6^$*(/47*(J<>0d\@.<>
i< 0
j< N/FWM+1< $/<>Z/ 6
$*(/4'< $<>0q@.<>k< 0
lK/dM*/4"#W/4&'M*/4(@3402F&,
Z$*(/4D8$*(/4&(< */4 AT[HT#(:'#(*J< $X< ("/4*C.("'w/ 6< /D*=<>0 :40(6u1*/4Vau_RA 4ow"C<J,(S(%V[UABalTA &ow<
V ′ijkl = Cδmi+mj ,mk+ml
∫
drdr′r2r′2Ri(r)Rk(r)Rj(r′)Rl(r
′)×
×∑
s≥|m|
(s− |m|)!(s+ |m|)!
rs<rs+1>
∫
dθ sin θP |m|s (cos θ)Pmi
i (cos θ)Pmk
k (cos θ)×
7:* 46)'!*$C!# A + !"#%&()* # *!= )*J= *JGH"=?&1" !"#%.+-,FE)A?.θ$2*3
φ$2'#:'# # '1.#3N=?.46'# # *!A +
.#3 #.O#&(=?$2A A + = * , $C!"# , $C!=?& . A #$3 = *@F!) **#&(#..$2'+J&()* 4 .= )*QP
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" .
×∫
dθ′ sin θ′P |m|s (cos θ′)Pmj
j (cos θ′)Pml
l (cos θ′),
alTA +oS(NN#(*0:M/4("C< $%IJ<>%/4G6l< */4(
C = 4π2βimiβjmj
βkmkβlml
< 0βimi< (Z0r0)F&,au_RA &o9AT7&:4(<>/4 /34(wZ#W/4$=< (w< :4$
θ< 0
θ′/ 6FW/
$*(/4(1$%;2!/ .< $N< :41$=< ("/4"&1" */4(@3><>/4 (1$;< C+:4(< $w/ 6B,D#W
Iijk ≡∫
dxPmi
i (x)Pmj
j (x)Pmk
k (x)
< (^/4I(/S/4$%,Z%6+p /S/ 6D^#< (< "(*J< FW< 000V<w3&*/4(p8$Q K"C< (/*/4@(1*Uw(0G/4 A4_56k(U*J< ((@,D:7/41TUS< :41$=< (&:4(<>/4 S*J< 9HT#< 0)(< 0=< $X#< (@5/>6&:4(<>/4;< **/4(0:G/
∫ ∞
0
dr
∫ ∞
0
dr′f(r<, r>) =
∫ ∞
0
dr
(∫ r
0
dr′f(r′, r) +
∫ ∞
r
dr′r(r, r′)
)
.alTA 4o
_NUr< $&(1$% ^/4FT.< 7<>V ′ijkl = f(αi, αj, αk, αl)
JS(f<(.<.%/4< $
6u1*/4/ 6%#< (< "(AU$*0VF+,Z1J< ($( "%"C<>$ <>/4"*F< */4@/>6Dr34^/4(F%.< $AJD/
ND1"MFW(#W("M1T.<>/4/ 6 6u/41(0* #< (< "( 0r0;F&,C[UAalTA o54 = 625
AXMD1"MFW(Z/ 6^($3 < &7&:4(< $5Z/ < Z$=< (:4 AX!/ 7/ 6U"3 < !FW*J< 1M/ 6KV/ .< $B< :41$=< (S"/4"&1" < 0!VI98*/4"#W/4&Z/ 6K< :41$=< (N"'/4"+1" */ (3><>/4d(1$Z0*10!M#(3D/41Z#< (< :4(< # S*9M(01*Kw+1"GF(K/ 6/4I(/7< 0G0#0+K3 < $1A w+1"MFW(K/ 60#W0& 3>< $1/ 6WS />8#< (@*$&(< */4'#< (< "(^^< $/V(01*0FW*J< 1R/ 6KV@,D""(S9HTF%0!F&,![UAalTA o9AWP(@$%, V#< (@*$5< (0@:41%<>F$ AWL5* M&:4(<>/4)3>< (=< F$
r< 0
r′*J<>FG@w< ##W0
S%/41TB*.< :4:^3 < $%1^*J< $*1$=<>0 i, k ↔ j, l A9HDB6l< *B*J< 10F+,tI98*/4"#W/4&)/ 6VE< :41$=<>(;"/4"&1" */4@(< &JAs5/ \.</4#W(<>/4(?alTA 4oC.< Q )(J< $Z3 < $%1)/4$%,4AwE/4$%,t*/4"#$9H (" alTA o< (
exp(ımφ)6u1*/4G/ 6S)< I"M1T< $0#W0*!/ 6S;#(*J< $
< ("/4*AB` 1TJC&:4(<>/4E*J< *$R/41TM< $$UC*/4&(F1T/4ES*.7/ .< $
φ0#W0*R0%X(&6u(/4"
φ′0#0*J AW;*J<
+:4(< $< R/dFW;(J< $nAKD/Bw;"C<J,?*/ >@1:&<>;%G< 0/4FT.< ?;< "(J< $3 < $1ZS(J< S0**9< :4F&,;0r%/4
(V ′ijkl
)?=
(∫
d3rd3r′φ?i (r)φ?j(r
′)2
|r− r′|φk(r)φl(r′)
)?
=
=
∫
d3rd3r′φi(r)φj(r′)
2
|r− r′|φ?k(r)φ
?l (r
′) = V ′klij,
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. "!
$Q i, j ↔ k, l A /4"MF:w< F/3&^w/N#("G1T.<>/4 w"C<,7*/4@(1*< $$Sd/4+1%3 < $&+1*)/ 6V0*;2\6u/4$$/S:Ew<,4AP(@J */4@(1*S< $$#W/4F$N#< ( />6p /M0* */4((#W/40:R/RZ< "N#< (@*$1*.<>G;r(@09H-G/ ':4(J<>(M;*/40 US*9-G#W/4F$FW*J< 15/ 6W*/40C#(/4#W(,4A&S+1"MFW(U/ 6X1*.#< (UK+1< $/7S1"
n∑
i
n∑
j≥i1 =
n∑
i
(n− i) =n(n− i)
2,
alTA &oS(
n!D1"MFW(C/ 60%X(&$"Tt/4(0(0 #< (A^ 01
*/41(V/ 6BS*J< $%*1$=<>/4 V/4FT.< 150%X(&5#< (w6u(/4" %< $
5/4(F%.< $
S*.\!1(d< (R#< (0d< :&< /F1$0!/4(0(0d#< (5/ 6^#< (AWN(01*'%< $D1"MFW(/ 6 &:4(< $
625/G3 < $1
120*< $*1$=<>0d6u(/ " alTA &o9A
_56k(^#W(@6u/4(":7N< *1< $*J< $*1$=<>%/4G(N< (5/4$%,24/4I(/V3 <>$1$6kJA
,)< (7$@0_N##0OH!]RA79HDS# Z(< @6u/4("C<>%/4C6u(/4" 7F< w/ 6<>/4"*S<J3476u1*/4/^q< (F< A 1@$Q K6u/4( ^%:4$U#< (@*$U@.<>U(< @6u/4("C<>/ 0r0!F&,V[U+AalTA &ow< 0qalTA +o9A,;(< @6u/4(" <
Vijkl =∑
i′j′k′l′
V ′i′j′k′l′∏
z=i,j,k,l(δzz′ + β(δz1δz′1 + δz2δz′2) + γ(δz1δz′2 + δz2δz′1)) .
alTA "$4o(9HT#$*%9HT#(/4SS$$X/ SFW$@0(>A
j ( $," d " ( `% " (2 ( " %(dy# $,+- / #".$
LN<J3D:< $$NE#< (< "((+1(0 /9HT#()6u1$$%,2*/40D8+1< &I0LN< "$O/4< Ea DA o9Tw"C<,C(@,;/'0=< :4/4< $%I7%JA #5T6u/4(@1<>$%,4T(VS/< < $%,+*)/4$%1T.%/42\:4(< $5*J< A?\0/q/ "#W/4!< &,6u1(@(C*/4D8@(< &Z/4dM/4985< 0dM />8S$*(/4#< (< "(Z*J< $*1$=<>0\ED*/4TA DA^B/qFW\< F$/?0=< :4/4< $%I% \<J3&)/?1d< 9F(1T)6u/4(* "/D0 AsN< "$%,d C$*'<rTHT0D1"MFW(R/ 6S$*(/4A?C0/\Q+/ C+1"GF(R/ 6$*(/4 6u/4(wJ< *.)<>/4" < 0/4 AD,< (
2$*(/4w6u/4(
He< 0
H− < 0 36u/4(LiBe+
+< 0He−
(#W*%34$%,4A+ S*/4@(1*w< $$TS#W/4F$*/4Tr:>81(<>/4N/ 6$*(/470@(F1T0d< "/4:CMr34Mq< (Z@.<>710E!*J< $*1$=<>%/4AD[^< *.Cq< (6u1*/4C&(/D01* /M#@.<>ATND1"MFW(/ 6*/4Tr:41(<>/4*J< )F*J< $*1$=<>0)<
Ω =
(2M
N
)
=(2M)!
N !(N − 2M)!,
alTA &o
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S(M
ZD1"MFW(w/ 6q< (w@.<>S< 0NZ+1"GF(w/ 6B$*(/4A
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2$*(/4Z< 0
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6u/4( < "#T,/4(*/4"#$$%,Mr$$0,D@" < 0(J< *. N"C<HT"M1" 3>< $156u/4(!< $%6=8Yr$$%0*J< nA AU6u/4(
N = MA P/4('!*J< !/ 67"/4(< t< $%6=8Yr$%$%0
@,D@")BD1"MFW(V/ 6"M1$%%#< (@%*$G.<>V6u/4(V<):4%3&?+1"MFW(V/ 6/4$Nh!Vr$$0!@.<>M5+1< $B/CM+1"MFW(N/ 6^@.<>N6u/4(
N = Nh
$*(/4N6u/4(N ≤M
A[^< *. />8/4(w(98#< (@*$Z@.<>7*J< )F9HT#(J0!F&,7*(J<>/4/4#(p8
<>/4(
|I >≡ |ij >= a†ia†j|0 >
/4( |I >≡ |ijk >= a†ia†ja†k|0 > .
alTA !&oM"M1$%#< (@%*$%@.<>7< (R+1"MFW(0!6u(/4" /4V/
ΩakS*9!N%(
45/4(
1206u/4(
N = 2< 0
3 (#W*9.O3&$%,o9ATZ"#$@w<,/R:4(<>Z*/4*1T%34
@.<>GV/\%(<>C/34(R0*ij< 0%6S< ##$*J< F$
kB(@(*:!
3 < (=<>/4(< :4/ 6B" /
i = 1 . . . 2M j = i+ 1 . . . 2M k = j + 1 . . . 2MalTA &o
/<J34/407:4(<>/4;/ 6B@.<>0%X(:M/4$%,CF&,<M#< AVLN< "$O/4< a DA o5$Q+734(@,d#< (Z*/4@:;/ 6w<;"M1$%%#< (@%*$R@.<> |I > < 0?<*/4>@1D8:&<>0"M1$%#< (@%*$%@.<>
< J | /SF1$0N^"C<.(HZ$"&/ 6D^LN< "$O/4< "C<>(OHHIJ =< J |H|I >= f(α1, . . . , α5).
D1*9<)"C<.(OHd*/4@R/ 6S< < $%,+*G6u1*/ R/ 6w#< (< "(α1 . . . α5
A6u1*/4^< (9HT#(0C"($%,V(/41:4'1"40%X(*&"M1$%#$%%*J<>%/4>0O83D/4 < 0d+1< (G(/D/ XF1T7"C<J,!FWM+1%M$: +, AX_56k(7*/4@(1*:LN< "$%/4=<>\"C<>(OH) G"M1$%.< /41$%,)<J3&M/;0=< :4/4< $%IM%7< 0d""'%I7/4FT.< 0$/w@: +3>< $1NS%(#W*S/R
α1 . . . α5#< (< "(AT
*/4"#$9HT%,V/ 6 "C<>(OHV#$=<J,D*(1*=< $D(/4$ R"#$O6k,D:S#(/+*A&P/4(B@.<>R:4(<>0q< V*/4"MF<>/47/ 6w/4#W(<>/4(6u/4(
2$*(/ J$"&
S*9\"C<J,FWR/4I(/C6u/4(N/4"3 < $1N/ 6U#< (< "(Z< (R/Sd\P:ATA TA ZG"C<J,!G<>ZG"C<>(OH!Z/ 734(@,d*/4"#$%*J<>0dF1T7%Z1(7/41TZ<>%"C<,GFW56u1(@("#$Or0F&,(:&< (0:N@,D""(/>6 N@,D@")AD6uJ<>1(7S$$XFW34!"/4(7"#W/4(@.< &w6u/4($=< (:4(w@,D@"A
L5/"C<J, M*$=< %6k,M@.<>N//4FT.< \<C"#$Or0\LN< "$O/4< !"C<8(OH ?qLN< "$%/ =<> a DA o;*/4""M1T)FW/ S% ?I98*/4"#/4+\< 0+1< (0!#)/4#(<>/4(nA A
[H,Sz] = [H,S2] = 0.
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0 10 20 30 400
10
20
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P:41(5TA TA 7(< $W@(1*1(N/ 6/4I(/M$"'+/ 6 ZLN< "$O/4< '"C<>(OH6u/4(B
28$*(/4M%1<>/4RS%Mw"M1$%#< (@%*$% @.<>U:4(<>0< K/4(0(0
*/4"MF<>/ / 6 10
/4#(<>/4(V*J< @0?/4?+1"MFW( A :Aa†1s↑ → 1 a†1s↓ →
2 . . . a†2p−1↓ → 10AV$=< (:4(wIFW/JHT5*/4((#W/40)/
2× 2 F$/D*.Q+5< 0"C< $$%(^< (0%3D01< $T$"+A4(N< (5< $/76u/41(2×3 FW/JHT < 0/4 3×3FW/JHXAs5/ 7<>$=< (:4@SF$/+*.QX*%34$%,;< I
7× 7 A
D/< &,!$*0d3 < $1Z/ 6^G/4#W(<>/4(Z@.<J,!+3>< (=< +N10(ZG< */4\/ 6'LN< "$O/4< WnA AW'0=< :4/ < $%IJ<>%/4\0/D7/ "OH!@9<.7S%0OX(+3>< $1/ 6N)/4F(@3 <>F$A-):4(< #*J< $w(#(&.<>/42/ 6N"C<>(OHXZLN< "$%/ =<>C"C<>(OH'*/4@(1*0/41*.@.<>wF$/D*.Q'0=< :4/4< $nA+L5* %;J< (;/0=< :4/4< $%I AP(@$%,2/4E/ *<> /$*(/4)"C<J,tFW$/+*J<>0q%(R/4?< "C/4(F%.< $^/4(V/4?p /\0%X(+M/4(F%.< $%Aqr(@*J< K01./\ < 1$ #(*#$;$*(/4G<J34/d<34;/4##W/4%#A?R*J< B Q+/ <>R(/ .< $#qV+1< $/\I(/AB(;< (r3&1*.q@.<>B/4'6u/4(J< *.qF< /4(F%.< $nA E*J< C/ 6 w/)$*(/4R$/+*J<>0/4 0%X(&/4(F%.< $%J< *. / 6V" "C<,2<J3&< < (F%(< (@,3 <>$1d/ 6R# I*/4"#/4+JA w/)$*(/4*J< EF1$0\/4:4(V<;@.<>GS%d/ .< $K#E%(S = 0
/4(S = 1
AW\M$=<>(5*J< XMI98*/4"#/4+N.< Q Z3>< $1 −1, 0 < 01AWM*$=< N0=< :4(< " / 6UR/4(0(0d"M1$%#< (@%*$%V@.<>Z50#$=<J,&0\\P:ATA $DA(RN< / (5+1@/4\< 5/C/ ./'r0!R@.<>S*.)rZ*." < 1T/4"C<>%*J< $$O,4AM"/4/>8/4(F%.< $@.<>7*J< dFWM"#$%,$=< FW$$0 F1TFO8/4(F%< $K@.<>R<J34/)0("0 AC*/4*/4VFW q'w//4(F%.< $@.<>S< (Z/S;P:ATDA TA[^< *.#< (/ 6B/4(F%.< $< w1*.@(1*1( A
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2 particle states # = 45
biorbital states #=40
Sz=1 states #=10
Sz=0 states #=10
Sz=-1 states #=10
S=1 states #=30
S=0 states #=10
monoorbital states #=5
P:41(ZTA $DA $=< / 67/4(0(0;"G1$%%#< (@%*$%N@.<>A7+1"GF(/ 6@.<>*/4"#W/4:GJ< *9)*$=< 0#$=<,40 A
? ? ↓↓ configuration Sz = -1
S=0 Sz = 0 configuration
↑↑ configuration Sz = 1
S=1 Sz = 0 configuration
←S+ S-→
orthogonal
←S+ S-→
P:41(MTA TA /4*/4ZFWw0%X(&7"M1$%%#< (@%*$V@.<>NS%!p /;0%6=86u(+5/4(F%.< $%A[^< *9)/4(F%.< $X#< (< 5<G"$< ( @(1*1( A
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(w< (10/4+1%3 < $&#< (6u/4(
5/4(F%.< $J*w< $$&/ (#< (0%X(B/4$%,
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/ .< $/ 640FO8/4(F%.< $T@.<>A4 *9 +<>6k(U5< 00%/4G/ 6X"/4/>8/4(F%.< $T@.<>
(#(/D01*R/ .< $+1"MFW(5/ 6 G"M1$%#< (@%*$%*/4Tr:41(<>/4*J< $*1$=<>0)alTA &o9AD7#(/+*01(7/ 6<3D:&<>:R< $/4:RZ#W/ F$%Z*/4*/4w 7(< #TA SB+1%3>< $+B/Sr0:5w $FD87/4(0< R*/+ *+D 4!+S'< 00%: /C< :41$=< (w"/4"&.<TA
S±/4#W(<>/4(5< (7/ 6B76u/4("
S+ =M∑
i=1
a†i↑ai↓
S− =M∑
i=1
a†i↓ai↑.alTA o
%< $U@.<>*J< qFWC*9/4-< M<!@.<>CS%q%(p /\#M1#q/4(Vw/#N0/S AWR*/40< 0!(0)@.<>R5/4FT.< 0)6u(/4" %NF&,!< ##$%,D:'S±
/4#W(<>/4(AXM6u/41(@d@.<> */4"#$:G1F#< * Z/4FT.< 0d1:V/4(@/4:4/4< $Op,*/40%/4 A\/41(S*J< W%5"($%,*/4((#/40N/*9< :4V/ 6:4FWwp /d("GF1$0%:!
S = 1Sz = 0
@.<> U#(/3D0:\+1S = 0
Sz = 0
@.<> A'*9< :4G/'@.<>6u/410EdZ<J,d"#$OrGLN< "$O/4< !"C<>(OH!d<C1F@.< +=< $"C< (X< Z/SdP:AWTA !TAXI/ 6B$=< (:4@F$/D*.Q
5× 5 AYS#< 0!/4@.<>
|A >=1√2(a†4↑a
†5↓ + a†5↑a
†4↓)|0 >
|B >=1√2(a†1↑a
†2↓ + a†2↑a
†1↓)|0 >
|C >= a†1↑a†1↓|0 >
|D >= a†2↑a†2↓|0 >
|E >= a†3↑a†3↓|0 > .
alTA 4oV@.<>S/ 6 |A >, |B >, |C >, |D >, |E > &34/4$%3&7%*/4@(1*98/4!< $$r34M/4(F%.< $A_N51(Z/41TN)V6u/4$$/S:'*J< $*1$=<>/4S%N*J< / NFW(01*0C6u1(@(^F< 0/4$$%,G/4'5@,D""(@,'*/40(<>/4A&wNIS/ 6X$=< (:4@RF$/D*.QE< $$/S6u/4(M< < < $%,+*/4$1T/4E6u/4(:4(:4K< V(9HT@N< < $%,+*N6u/4("M1$=< 6u/4(w(/+/ S/ 6#W/4$%,D/4"< $%w1#/G7r6k)/4(0(A
'F< d'P/D*.Q\#< *G6u/4(<p />8$*(/4@,D@"g*J< EFW'10?< V<@.< (@:C#/4+56u/4(5"#$O6k,D:'MLN< "$O/4< )"C<>(OH;6u/4(5V(M$*(/4@,D@")TIZ/ 6S*.
120× 120 ATY6 7:4(<>5.NF< w7P/+*9Q'#< *%(<>:;@.<>;alTA !&oZ(< :4\alTA &oNw/4FT.< 34(@,E%"#$'@.<>
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0 10 20 30 400
10
20
30
40
P:41(MTA !TAXM/4I(/$%"+Z/ 6UGLN< "$O/4< !"C<>(OH6u/4(N2$*98
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5× 5 7("C< :'< ( 2× 2 < 0 1× 1 A
F1T NLN< "$O/4< '"C<>(OHGS$$/ F534(@,C0=< : /4< $nA4N/4I(/M$"&/ 6UMLN< "$%/ =< )"C<>(OH;6u/4(5(M$*(/4Z< (R9HTF%0\dP:ATA TAWB//4FT.< )F< C/ 67"M1$%#< (@*$%@.<>C\P/D*.Q-#< * !9HT#< 0t9HT@:F< Z6u/4(Zw/$*(/4F&,< 00:;M(0 A (C< (M('"C<>@/4(%1<>/4 i 6 ?@.< (@'S%;r34)"/4/>8/4(FO.< $ @.<>AK?)< 00-/d" <\(0$*(/4 AW]Z1V/ < 1$#(*#$ %N*J< / NFWR$/D*<>0!/4!V< "/4(F%.< $w< M;%< $^p /A^D/d(< (6u/41(G/ (FO9<>$M$6kM/d#$=< * $*(/4 ^S*. # *J< <J34d< +,3>< $1 AD/^w\:4
4 ∗ 2 = 8 (#< (@*$@.<>R6u(/4"<!:4$/4"/4/>8/4(FO.< $Kp />8#< (@*$@.<> AT#(/D*01(7 0/4NS%< $$/4(F%.< $Cw*$=< w/M<> r< $$%,!/4FT.<
5 ∗ 4 ∗ 2 = 40@.<>A_N"#/4(@.< +N6l< *97// GN<>
M<34G< $(J< 0T,):4/ kzjY j.z S%! /;$*(/4N/4\R< "R/4(F%.< $nA_00:G<R*/40;$*(/4;/4/4"N/4(F%.< $<RFO8/4(F%.<>$@.<>N*J< ;/4$%,$J< 0q//4;/>65;@.<>G/4FT.< 06u(/4" <\"/4/>8/4(F%.<>$@.<> A^D/U< $$"M1$%#< (@%*$%N@.<>w0*10)1F+1J&$%,<34Z/M*/4@/ 6B$*(/4/4E(C0%X(+R/4(F%.< $%ABD*"/4/>8/4(F%.<>$U@.<>M< $%w<,DV<J34S = Sz = 0
^!(1$%.< +?#< (@*$)@.<>!FW$/ :4/?!1F#< *S = 1/2
< 0Sz = ±1/2
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0 20 40 60 80 100 1200
20
40
60
80
100
120
P:41(NTA TA+Z/4I(/M$"& / 6ZLN< "$O/4< "C<>(OH'6u/4(38$*(/4
%1<>/4 &S%;@.<>:4(<>0)< /4(0(0;*/4"GF<>%/4 / 610/4#(<>/4(
*J< @0)/4)+1"MFW( A :Aa†1s↑ → 1 a†1s↓ → 2 . . . a†2p−1↓ → 10
iki 6 ?Z< 00< $*(/4C/RN9HT@:S = 1
@.<> ADYw< /MFWN$/D*J<>0/4<M(0)/4(F%.< $lF*J< 1R@.<>5*/4@(1*0!/41T5/ 6 /Q+05/ 6/4(F%.< $<J34V< $(J< 0T,FW)0#$0);#(3D/41*J< A_**/4(0:G/P:ATA (V< (Z(*$=< 5/>6@.<>SS%
S = 16u/4( p /'$*(/4AV
$*(/4*J< VFW^7w/S@.<>nA AJ%*J< V%(<34^#V1#V/4(#V0/S A ZM< 7< $//;/ V<>Z(G< ( (5
3
)= 10
/4+1%3 < $&7*./4*Z/ 6( /4(F%.< $%/41TK/ 6r34 A4D/><J,4 w:
3∗2∗10 = 60 @.<>A?:4 / .< $D#M%(S = 3/2
/4(S = 1/2
A R 6u/4("(B*J< w w<J34<C+1< (@NS%\#W/4F$V#(/ @*/4N/4\I98p<HT −3/2,−1/2, 1/2, 3/2 AX$=<>(*J< wC<J34C/4$%,d'w/!"00$M3 < $1AqJ< *.q/ 6 (#< (@*$Z1FW*$=< S(V< (
10"M1$%#< (@%*$%Z@.<>
ikiki 6 P< $%$%, K !*J< < 00(0$*(/4/ES = 0
w/?$*(/42@.<> A?Z*J< ;*/41+wZ@.<>S< < $/4:4/41$%,4D< < FW/3& AD?7<J347/4$%,/47*$=< / 67FO8/4(FO.< $w />8#< (@*$@.<>S%
S = 0AwD/^FW*J< 1\/ 6Z) /
#/4F$@.<>S/ 6$*(/4;w:41 ∗ 2 ∗ 10 = 20 (98#< (@*$Z@.<>A
?R*J< \1" 1#!M@.<>R*/41&7/4FT.< 0!)V(M%1<>/4N< 0\/4FT.< )/ .< $+1"GF(C/ 6
120"M1$%#< (@%*$%@.<>^S*. < :4(S%-!+1"G8
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0 20 40 60 80 100 1200
20
40
60
80
100
120
P:41(7TA 4ATs5/4I(/'$"&/ 6LN<>"$%/4< C"C<>(OH6u/4( 3$*(/4
F$/+*9QZ(#(&.<>/4 S%^"G1$%%#< (@%*$K@.<>: (<>0M7^w<J,/4(:4<>%:6u(/4"
28#< (@*$98F< %7:4(<>0?J< ($(A $=< (:4@X*%34
F$/D*.Q8× 8 A
0#*0??P:ATA 4A` $/D*.Q+V*/4((#W/40:/)0%X(+3 < $1/ 6S< 0
Sz*J< ?FWC ABC@.<>M< ('/ R/4(@0qF1TR34%%0'F$/D*.Q+,?< (0*/41#$0G+/N1FF$/D*.Q+A4w$=< (:4@KF$/D*.Q/ 6"G1T1< $$O,0#W0&^@.<>U< wI
8×8 A4L5*ww:4&3>< $1K*J< GFWw$/+/4Q40M1#G0#W0&$%,RM0%X(p8+F$/D*.Q+AYS0/D/ S< $$/ 6u/4(< < < $%,+*N/4$1T/4 DF1T7"C<>(OHC/ 6B1*.I7*J< )FJ< $%,< 0;34(@,;(< #0$%,C0=< :4/4<>$%I0;+1"(*J< $$%, DS%/41T(/4(@@8:)/\< +,E/ 6w< 0T3 < *0"/D0ABVR&=< $n< VC/4#T"%IJ<>%/4/ 6<6u1*/40#W0:?/42"C< &,-#< (< "(
α1, . . . , α5(+1((#WJ<>0
*J< $*1$=<>/4)/ 6KV6u1*/4 53 < $1WJ< *.d&34/4$%3D:'6u1$$0=< :4/4< $%IJ<>%/4 A6u1(@(K0*/41#$:Z/ 61FF$/+*9Q+S%RwF$/+*9Q7S%M:4%34M3>< $1K/ 6#MK<"C< %6u@.<>/4R/ 6W/4(@/4:4/4< $Op,V/ 60%X(+U/4(F%.< $A>YK< U/ ^< 1"0''< 0D83 < * WF1T5V#(/+*01(R/ 6K/4(0(:'V"G1$%%#< (@%*$7@.<>N< $/#< (<>/V/4"S9HD&J&S#< *S%':4%34'3 < $1^/ 6WS/ .< $< :41$=< (U"'/4"+1")A_N< $%(<>%34N< 06u1$$%,G6u/4("C< $"'/D0/ 6:4(<>:RN"G1$%%#< (@%*$SF< w/41$0)*/4@N/ 6U"M1$%.< /41:4(<>:<'(N/ 6K@.<>5S%rTHT0!3 < $1/ 6SSzLLz1:)$=< 00(/4#W(<>/4(
S±< 0
L±AB` 1TR%1(/!FW
/ C*< (@,4w<>')"#$(G"/D0&(/D01*02F&,-1(!#(/3D0C< $/<>@6k,D:'(1$%A
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HE H− LI BE+
HE−
%$
< F$'TA 4A Z#T"%I0` /4(p8/4(F%7(< 0ai = α−1i
/ 6 J >< 0 #E/4(F%'au1%/ 6
a0o9'/34($=< #
SFp q(/4("C< $%I0 JR< 0 >V@.<>B< 0
:4(/410@.<>Z(: ,C6u/4(Z$:4&@w<>/4"w< 0;/47akS%Cr34VD$=<>(/4(F%.< $.< Q '&/7< **/41&9oA4P/4(*/4"#< (/4 9HT#W("&.< $D3 < $%1U/ 6W(: ,R.< Q 6u(/4" n< (^0#$=<J,&0 AJ(6u(* (: ,76u/4(
H− /47.< Q V6u(/4" a1s a2s a2p S EG
a,oEexpG
a,oH
8 8TA !"!"! H− TA !"! 4A - 4A $ 8TA 8 4A --$ 8 4A He
TA "$ TA "$ TA " 8TA "$ 8 DA $! 8 DA %$! He−
4A 4 4A TA & 8TA $ 8 DA Li
TA -$ 4A TA TA 8 A 44 8 A ! 4Be+
TA "$" TA "4 TA ! TA "! 8 TA 8 TA
&.$ 2 "$ He H−
Li Be+ %(dy
He−
`,0=< :4/4< $%I%:R7*/4((#W/40:LN<>"$%/ =<>"C<>(*< 01F+1J&$%,4"%"%I%:!$/ @:4&3 < $1S%t(#W*/?!#< (< "(
αi8R
(< 0=< $9HD/4\/ 6Uw<J34R6u1*/4 R/4FT.< )R(1$%5#(+0d!< F$TA 4A&(N^/4$%,G/45#< (< "(U3>< $1
a2p6u/4( <>$$ >#@9<.w< ^S3>< $1
a2pm< (< $$ +1< $wS%q+1"(*J< $w< **1(< *, ∼ 10−6AKG6l< *'(*9.G
#(*J< $U@,D""(@,d/ 6 /41(#/ +=< $lAP/4(79H< "#$ ':4(/410E@.<>'(: ,/ 6KL5V
EG = −5.794,4S*9)S*$/47/'V< **#T0\9HT#("+.< $ 3 <>$1
−5.8074 :4%3&dG"#$*O,)/ 6 /41(7< ##(/&< *9 AP1((Z"#(/34"&76uJ< F$;F&,%('(*.:dF< 'F&,-*$10:\n = 3
@.<>'/4('F&,(/4(@:G/<'$=< (:4 < 1=< F< S%"C< &,;#< (< "(TS*9!< $$/S 6u/4(34(@,)< **1(<>73 < (=<.%/4< $X@"C<>- +4nA
P/4('H− / 2 d< $/?/4FT.< 2*/4((*;(1$%A, < :4()S%t/ (
*J< $*1$=<>%/4C/ 6d:4(/410D8@.<>\(: , wDwnA ?d:4;*/4((*$%,:4$ZFW/410)@.<> -$ 6u/4(w@,D@")A
EC*J< q(#(&MC:4(/410?@.<>C"M1$%O8Y#< (@%*$Gw<J34C6u1*/4?P/+*9QC#< *V;76u/4("ga DA &ow< 6u/4$%$/S T6u/4(
He<>/4"
|ΨHe0 >= (−0.799211a+1s↓a+1s↑ + 0.411751a+1s↓a+2s↑ − 0.411751a+1s↑a+1s↓−0.135451a+2s↓a+2s↑ + 0.0357708a+2p0↓a+2p0↑ + 0.0357641a+2p1↓a+2p−1↑
−0.0357641a+2p1↑a+2p−1↓)|0 >, alTA 4&o
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- .
< 0?.C/4C/ 6p /\#S = 1
2
0:4(<>Li
:4(/410q@.<> A :AS%Sz = +1/2
|ΨLi0 >= (0.99749a+1s↓a
+1s↑a
+2s↑ − 0.057024a+1s↑a+2s↓a+2s↑ + 0.003959a+1s↑a+2p0↓a+2p0↑
+0.003959a+1s↑a+2p1↓a
+2p−1↑ − 0.003959a+1s↑a+2p1↑a+2p−1↓ − 0.023783a+2s↑a+2p0↓a+2p0↑
−0.023781a+2s↑a+2p1↓a+2p−1↑ + 0.023781a+2s↑a+2p1↑a+2p−1↓)|0 > .alTA +o < FW/349HT#(/41^^/4(@/4:4/4< $%I0F< 6u/4(^*(J<>/4/4#W(<>/4(S*9'#(/3D0^1^@.< 0< (0< +*/ ""M1T.<>%/4M($=<>/46u/4(
a< 0
a†/4#W(<>/4(
s5/ ^<>B <34 <51F@.< &=< $D< 0"OHD1(^/ 6T9HT*%0D8:4$B@.<>ZaJ ↑ > ↓< 0 J ↓ > ↑ o/M7"#$N+,D0(/4:4*98$%Q4N*/4Tr:41(<>/4;/ 6 He aJ ↓ J ↑ o9A Z*/41$02< $/(< @6u/4(" p /?9HT#(/4/)(#(+.<>/4%$*(/4)*(J<>/4/4#(<>/4(
a†%< $ <>/4"%*Z@.<> nA A
|ΨHe0 >= (−0.82274a†1s↓a†1s↑ + 0.309636a†1s↓a†2s↑ − 0.404512a†1s↑a†2s↓−0.021729a†2s↓a†2s↑ + 0.0357708a†2p0↓a†2p0↑ + 0.0357641a†2p1↓a†2p−1↑
−0.0357641a†2p1↑a†2p−1↓)|0 >, alTA 4o< 06u/4(w
Li<>/4"
|ΨLi0 >= (1.01321a†1s↓a
†1s↑a
†2s↑ + 0.018639a
†1s↑a
†2s↓a
†2s↑ + 0.005804a
†1s↑a
†2p0↓a
†2p0↑
+0.005804a†1s↑a†2p1↓a
†2p−1↑ − 0.0058034a†1s↑a†2p1↑a†2p−1↓ − 0.024289a†2s↑a†2p0↓a†2p0↑−0.024286a†2s↑a†2p1↓a†2p−1↑ + 0.024286a†2s↑a†2p1↑a†2p−1↓)|0 > .alTA &o
Z*/4"#$5/ 6(:4< 0"M1$%#< (@%*$%S@.<> 6u/4(He
<>/4" 0p8#$=<,40;;_N##W0OH[A Z7"C<J,C/ *N<>w7*/D *&S6u(/4&/ 6
a/4#W(<>/4(0/)/ 3&?+1< (1" /;'#(/4#W(#(/4F< F$Op,!/4("C< $%IJ<>%/4 S*9q/41$0?FW
1ABRR/ M<!"@.< Q C< 0qR*J< 10F&,EC/4/4(@/4:>8
/4< $%,/ 67\F< 0*10 D*/4 DA 4A?\\<>\#(/4F< F$Op,/ 6*/41+(:?!*/4Tr:41(<>/4
1s2tL5!C$<
2/3US(J<
*/4((#W/40:*/4Tr:41(<>/41s22s
6u/4( ^< $%"/4@7*/4*0ZS%\<>76u/4(Z+,D0(/4:4*98$%Q4G#*1( A(J< /4E6u/4(Z0%X(*701'/'*(*1"G8@.< *G<>ZM/34($=< #d&:4(< $
S =< 1s|2s > FWw1s< 0
2s@.<>7
76u/4("(w*J< $=< (:47< 0;73D(@1< $W(< %/41s 2s
0/'/ S&34/4$%3&7<1F@.< +=< $*.< :4SGN /41$/4"MFG(: ,4A+/ w<346u1*/4^*J< 'FWS10/'3 < $1<>< &,:4(/410D8@.<>7*9< (< *(@*ZF+,*J< $*1$=<>:
< ΨG|O|ΨG >6u/4(
O(#(&0?d>0E+1< &I06u/4(")A P/4(Z9H< "#$ XG0#W/4$M"/4"&
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He H− Li Be+
He−
-!
/4#(<>/4(;d = e
∫d3rΨ†(r)xΨ(r)
* A "C< (w</4($=<>%3D@%*+1< &1" r$0;/4(@,;/ 6K<>/4"*Z@.<>S*J< )FW76u/4("M1$=<>0
_N/ (N6uJ<>1(R/ 6^/41(Z< ##(/&< *.dN*/4*0dS%!M0("<>/4)/ 6'"*(/4*/4#%*G#< (< "'(
Vijkld/41(VLN< "%$%/4< W*G(7Q+/S$0:4
*(1*=< $6u/4(^Z<./ "*98*$1@(^*J< $*1$=<>%/4+< $$W< 6u/4(^N0("<>/ / 6X#&,D*J< $#(/4#(@^/ 6 9HD00@,D@" < <Z6u1*/4'/ 6XS$=<>*w#< (< "G8(AXsN< "$%,4 R*J< \(S(%RLN< "$O/4< qa DA o 6u/4(SR*J< R/ 6U:4$V<>/4"?<)$/4:4(6u/4(")F1TRS%?#< (< "'(J<>RVJ< (/!&(#(M< 0?<>< ##J< (5/ 6k;3 < (/41"/+0$< "$%,
H =∑
iσ
εiniσ + t∑
σ
(
a†2σa1σ + a†1σa2σ
)
+5∑
i=1
Uini↑ni↓ +1
2
∑
i6=jKijninj
−12
∑
i6=jJij
(
Si · Sj −1
2ninj
)
+∑
i6=jJija
†i↑a
†i↓aj↓aj↑+
∑
i6=jσVijniσa
†iσajσ.
alTA -$4o
GM;/4##:d&:4(< $ FWwJ'< 0 >G@.<>Ui
< (;&(< /4(F%.< $ /41$/4"MF-+(< */4
Kij< (;(&(/4(F%.< $w*/4((#/40< +
VijG
/>8*J< $$0C*/4(($=<>0D8/4##:M&:4(< $nD< 0Jij
Z0(*9HT*.< :47&.:4(< $n6u/4(w@.<>
i< 0
j = 1, . . . , 5A#(*#< $X#< (< "(0r0!< FW/3476u/4(w
<>/4"G< 0$*0/4G< (;#(/3D00-<>F$TA DAKP(/4" M6u/ ("M1$=<>/ R6u/4$$/S%:C&(#(.<>/4!*J< dFWM0(<JS AXG*J< $*1$=<>0!(: ,\0%X(*∆E
6u/4(He
Fp G:4(/410@.<>G:4$9< 0dMr(@.HT*%0(#$Z−2.3707 − (−5.794) ' 3.423Ry
a^M%:4$1s ↑ 2s ↓ N@$$ ,\:4(.o9A7*/4((#/40:G(: ,/ 6Z(#1$%34 /41$/4"GFC&(< */4C6u/4( $*(/4
\1s2
*/4Tr:41(<>/4dU1 = 3.278
XG3>< $1G*/4"#< (< F$R/∆E
A _00O8/4< $$O,4G(#1$%34M&(/4(F%.< $K / 1$/4"GF\&(< */4!
1s ↑ 2s ↓ @.<>GK12 ≈ 1.5Ry
&<71F@.< &=< $$%,V$/ (K3>< $1 A4S($=<>%34w(:4*U$$K1KS&, V<J34R<G1F@.< &=< $< 0"OHD1(7/ 6B9HT*%0
1s ↑ 2s ↓ @.<>7/G%:4$1s2
A/ (w /4(0<G1F@.< &=< $ /41$/4"MF;&(< */4;(1w+,D0(/4:4*98$%Q4*." W< $%/41:4;R< *1< $ 3>< $15*/41$0)FV@$$ "/4(7(J< $@*ZF+,;(*9%:6u1(@(7(=< $XF< wS%
n = 3@.<>A
Y6 Z*/4"#< (5Z(:4w/ 6 Z9HT*%0;@.<>w/4FT.< 0C *J< $*1$=<8/4MS%GS9HT#W(%"+.< $(1$%> /4S*J< '*$J< $%,M3 < @0*(#< *Aw/4F(@340G9HT*%0D8(: ,M$34$K< ( />3&(@,V $$D(#(/+01*0 A+)($%,(+1< $%.<>O34V#(/4#W(@Z< (R"$< (AM(J< /4\6u/4(51*.E<FW<J3D/4(N5R/4#D8"%IJ<>%/4/ 6NF< GS%(#*C/d):4(/410@.<>(: , m>h| AU/4(F%.< $S.< Q4G<< #WG"/4@Z*/4+34&7S%d(#W*/CZ+1< +%,4AD/W6u/4(d9HT*%0 "M1$%%#< (@%*$!@.<>;d0*/4"#W/4%/4t&/:4$98$*(/4t/4(p8F%.< $V"C<,EFW;/ G*/ ((*9< &,q$/4:4(AB;9HT#W("&.< $ #W*(<TK/4qS*.N$34$W0("<>/4'F< 0 < (5/4FT.< 0CF&,'Z< F/4(FT/4C/4(^N"p8/4E/ 6#/ /4ABC@.<>/ 6$*(/4ES?V#(/D*R.< Q+:)#$=< *
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.
< F$TA DAK)*(/4*/4#*C#< (< "(au ,oV/ 6w$*0<>/4"R< 0/ JA_N$$+1< &%< (5*J< $*1$=<>0G6u/4(U5/4(@/4:4/4< $%I0C<>/4"*@.<>A&U. Jp8>7/4##:"C< :4%10
UiN'&(< /4(F%.< $K /41$/4"MFd&(< */4-au Jao9>a 4o9>#M" al&o9>< 0 >#M" ±1 au#oo9S(J< Kij
< 0Jij
< (w&(/4(F%.< $ /41$/4"MF)< 09HT*9< :4V&(< */4;#< (< "((#W*%34$%,4A
t U1 U2 U3 Up K12 K13 K23 J12 J13H− TA "$ A 44 TA "! TA $"$ TA $ TA ! TA -$ TA "$ TA TA "He
4A TA "$ 4A " 4A ! 4A A "$ DA ! 4A "! TA TA -He−
8 4A A TA $ 4A $!" 4A $ TA !! 4A 4A TA "! TA Li
8TA TA -$ TA 4 TA DA !4" TA $ -! TA TA $ & TA TA Be+
8TA !! TA "! TA "!3 A "$!3 A -! 4A ! A " 4A $ TA TA 4-$
0r%$%,-/ @.<>/4< (@, ^/?)T6u/4("C<>%/42< F/41T!:4(/410t@.<><J346u1*/4 1*.E$Q4V.G/4#T"C< $B#< (< "(
αi "C<J,\:4$/4@7\7#(/D*A
d/4$%,< 1"'#T.%/42 d*J<> "C< Q d< F/41T!9HT*%0 "G1$%%#< (@%*$%)@.<>(C/4(@/4:4/4< $O,/?!:4(/410t@.<> A \/4(@/4:4/4< $O,-.\P/D*.Q#< *M5/ 6U*/41(G< 1(0dF&,M#(/+*Z/ 6U0=< :4/4< $%IJ<>%/4 A` 1TJW!:4(< $*J< ^!:4$#< (@*$;/4(F%.< $G0/?/ C<J3&/?FW)/ 6Z)< ")< #W)6u/4(79HT*%0@.<>A?7Q #(w< #W< 0;w< ikjlinm>hW z.zy NWjlinm>h< FW/41T5M@.<>AWB/C"#(/3&7M< **1(.<>*,4X/4w/41$0!<J34V/C#W(@6u/4(" < < 00%/4< $/4#T"IJ<>%/ \/ 6UG(: ,\!G1F#< *7S%< $%$@.<>XSO.$/ (B(: ,V< R @.<>w< *1< $$%,70("0 >9HT*$100 A /4(@/4:4/4< $Op,*/40%/4\ /41$0$J< 0d/)<;+1"GF(/ 6 1F+1+R*/4@(< &/4d
α/4#TO8
"IJ<>/4)#< (< "(W"C< Q+:+1Z\"/4@Z*J< WM#(/D*01(M1<3>< $=< F$6u(/4" G#(< **J< $#W/4&7/ 63DAD/4""NZ7/49.$V#/4F$ < S$$F;/S--D*/4 DA 4F1TG%MR/ R;*J< C6u/4(R"/+0$w< 0qF< S$*0)( A
L5/ 0/D7GIG/ 6G:4$M#< (@*$MF< 7<>X*G(1$% CP/4(Z< Q4M/ 6U*/4"#< (/4 R< "R*J< $*1$=<>%/4S (G< $/C#W(@6u/4("0!1%:;<C"G8#$(F< A+N*J< N/ 6 5"#$@#W/4F$5F< */4@:V/4$%,'/ 6
1s@.<>
5< $(J< 0T,*/4+.< 0)!D*/4 DA TA M:4%3D:G6u/4(SL5R<>/4" α = 27/(16a0)
< 0EG = −5.695Ry S( a0 ' 0.53 AK;9HD(*.(MF< G*/[email protected]/ 61s
< 02s
@.<>ABYG< $$/S76u/4(R< ?@.%"C<>/4E/ 6wC 1*C/ 6wCI/ 6:4$#< (@*$;F< G/4)< **1(< *,-/ 65*J<>$*1$=<>/4A'(01*0F< *J< $*1$=<>%/4G"C< Q4)< $/?<d3D1< $IJ<>%/4-/ 6N):4(/410@.<>)(: ,2< <6u1*/4d/ 6G/4#T"%IJ<>%/4\#< (< "(
αi#W/4F$>< Z '/4$%,!<34Mp /
1*9!#< (< "(AR:4(/410)@.<>V(: ,)S*J< RS/S\!P:TATA 6u/4(Z
He<>/4" < 0EEP:A TA 6u/4(7
H− /4 A Z'*J< EG6u(/4" #*1(T<>w7:4(/410;@.<>7(: ,0#W0S@(/4:4$%,C/47/4#T"%IJ<>%/4
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He H− Li Be+
He−
12
34
Α1 a01
2
3
4
Α2 a0
-4-20
EGS
12
34
Α1 a0
P:41(5TA DA+N:4(/410C@.<>N(: ,/ 6 ZL5N<>/4" < w<6u1*/4/ 6+34(<>/4"*7/4(F%.< $I
α16u/4( JZ< 0
α26u/4( >W(#*%3&$%, A ZR*J< !*$J< ($%,
<>/4#T"%IJ<>%/4;/ 6B#< (< "(S0/+5"C<>( 6u/4(w(: ,4A
#< (< "(A? <34w:4$/4F< $&""<SRFW/ M%1<>/4A_N/ (:5/N/ "%$=<>(Op,V/ 6. p /7#$/ A Y6X/4 9<>Q4U&/< **/41&U(*J< $:Z/ 6<HT4*J< 10'F+,V*.< :4/ 6w+1*$J< (K*9< (:4wF&,Rw6l< */4(/ 6 /Fp &,D0(/4:4%/4d< 0\M$1" <>/4")/4M*J< d/4F(@34M.<ZM:4(< $< #W/ 6B3>< $$,DS;FW/ )#$/ "$<>(ATS9HT#(5V<%p,/ 6B@,D@"A
N+1"MFW(/ 6 "M1$%#< (p%*$@.<>^6u/4(Up /R/4(F%.< $%U (42
)= 6
&S*.C#$%1#-+/\(#D8:4$'< 0-/4(#$JA"C<HT"C< $+1"MFW(G/ 6N$*98(/4XS*.E*J< FW'< **/4""/D0<>0dF&,!.%7"C< $$(NF< 7
4A` 1T7'*J<
S%)"/4(7< !< $%6Br$$%:'*J< !FWV"C< ##0!/4&/'R*< VS%)$S< !< $%6r$$0q@,D@")/d*J< $*1$=<>%/4M< (/S-/4$%,6u/4(R1#/
2$*(/4nA A
HHe
<>/4"w< 0CH− /4 ADZ(1$%w/ 6 *J< $*1$=<>/4 < (N/S
?< F$CTA TA?CCC/4F&3D/41V6l< *R<>VF< V$=< (:4"+R"'#(/34'< **1(< *,4AP/4(
He<>/4" '($=<>%34M((/4(Z/ 9H< * R3 < $1M
1.89%6u/4(N/4M/4(F%.< $n.86%
6u/4(5w/;/4(F%.< $%Z< 0.19%
6u/4(Nr34G/4(F%.< $5!MF< JA?M< $%/'Q+/ <>56u/4(5< !Tr%F< V /41$0!(J< *.)R.H< *N3 < $1 S*.)0%X(6u(/4" 9HT#W("&.< $F*J< 1wV< $/'"C< 07/4"< ##(/HT"C<8/4N/4\GLN< "$O/4< nA AX%ZN/4d($=<>%3D@%* AY7Z*$J< ($%,)d6u/4(5
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.
0.51
1.52
Α1 a0 0.2
0.4
0.6
0.81
Α2 a0
-1-0.8-0.6-0.4-0.2
EGS
0.51
1.52
Α1 a0
P:41(TA TAT< "< SP:ATA V6u/4(SL − /4 A*J< '/ 6&,D0(/4:4EdB< F$'TA MS(GG:4(/410d.<>M(: ,dZ/ 9H< *$%,+1< $/C1%,4AWP/4( J< Q4(NFW/410!@,D@"Z$Q
H− V"#(/3&"&501/F< M(*."&GR($=<>%34$%,$=< (:4(AB_N$/IC/ 6SC3>< (/41RF< M/4(p8F%.< $^*.< :4 +F1T '^*J< N%*J< / FW5*/4"#< (0/59HT#W("&JA+/4(F%.< $IM/ 6K >#\@.<>Z"C<,FWG<C$%$%VF%N1*/4""/4 F1TZM@.<>*/4+(F1TV<($=<>%34$%,;"C< $$< "/41&S./'V:4(/410!@.<> W/V#(/4F< F$Op,/ 6Z*/41+(:E$*(/4K6u/4(M@,D@"*/40(0 ^/4-)/4(F%.< $%K< $"/4@:4$:4%F$ A
Z)*J< t< $/E$/D/4Q<>')(/4$/ 67/4#T"'IJ<>%/4-/4-\< **1(< *,/ 6Z< ##(/&< *9 AWdB< F$MTA CwM*/4"#< (M:4(/410\@.<>M(: ,\< 0\R"*(/>8*/4#*#< (< "(76u/4(7
He<>/4" < 0
H− %/46u/4(7%1<>/4dS%?< 0S%/41T/4#T"%IJ<>%/4t/ 6d#< (< "(
αiA Z$%, J< 0>;/4(F%.< $%C (
.< Q4d&/;< **/41&JA Z\M9H< "#$R/ 6$1" *J< dFWMd<>ZM:4(/410(: ,G3>< $1w6u/4( m>hX /4#T"%I0G/4(F%.< $TF< ^K$/ (K< G<>U6u/4( j ' m / /4#T"I0;/4(F%.< $wF< AV"*(/4*/4#*Z#< (< "(5< (/ 6B< "/4(0(< 0*.< :4R< ('"/4('&=< $U6u/4(Zp />8#< (@*$M+(< */ #< (< "(AYZNF*J< 1M R<34R6u/41(Sw<34R6u1*/45)M*/4((#/40:&.:4(< $/0%X(*
αi#< (< "(UK*/41&0GpS* A U< F$w/SU"#/4(p8
.< *Z/ 6 Z/4#T"%IJ<>%/4#(/D*01(N6u/4( @.< F$:Z$*(/4*N@(1*1( A
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He H− Li Be+
He−
< F$RTA TA Z#T"I0!` /4(p8/4(F%5(< 0ai = α−1i
/ 6JZ< 0 >7D$<>(5/4(F%.< $!1%Z/ 6
a0WR:4(/410d@.<>M(: ,)6u/4(5M$:4&@Z<>/4"Z< 0\/45S%
/4$%,;w/C/4(F%.< $AM(: ,\< 0)M#< (< "(50%X(*VSd*/4"#< (0S%;r3498/4(F%.< $ %1<>/4Eau< F$VTA o S< $/G/S A
a1s a2s EGa,o
∆a1s[10−3] ∆a2s[10
−3] ∆EG(Ry)H
8 H− TA !" 4A $"!"! 8 4A TA $! 4A DA He
TA -$ TA "$" 8 +A $ -! 4A DA TA 4"! < F$TA AK)*(/4*/4#*C#< (< "(;au ,o/ 6$*0-<>/4"M< 0q/4A_N$$ +1< &%S< (*J<>$*1$=<>0;6u/4(w/4(@/4:4/4< $%I0)<>/4"*Z@.<>AVF< */4@Z/ 6JZ< 0 >N@.<>Z/4$%,4A
tS Jp8 >N/4##:C"C< :4%10
εiS
<>/4"*Z(:>,4Uiw+(< /4(FO.< $ /41$/4"MF;+(< */4 DS(J<
K< 0
J< ( &(/4(F%.< $D /41$/4"MFM< 0R9HT*9< :4w&(< */4V#< (< "(A>w$/ (#< (@/ 6 '< F$G/SG3 < $10#$=<J,40?< FW/34< 0E*J< $*1$=<>0dS%/41T/4#T"%IJ<>%/4?/ 6S#< (< "(
αiA;&,D0(/4:4*98$Q 3>< $1
α1 = 2< 0
α2 = 1 (.< Q AV$=< @S*/4$1"/SS:4(/410@9<.7(:4A
t ε1 ε2 U1 U2 K J EG
H− TA 44 8TA !"!"4 8TA & 4A TA TA - TA "! 8 4A " He
4A -! 8pTA 8TA "!""$ TA "! 4A -$ " 4A "! TA "! 8 DA $ -!4H−noopt
8 8TA 4A TA TA !" TA &"! 8 4A $ Henoopt
8 8 DA TA TA 4"! TA "-$ 8 DA
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vZ[jM PdO@I
QT M`V;O T KWV;O.XAYZV;O.R [N\Z] T KWV;O.XAYZV[jIQ;KW\ZR
9HDJ"/4(G*/4"#$*J<>0 @,D@" <F=<>/4"%*G"/4$*1$M/4(V<"/4$*1$=< (/4 nA+Z"#$@*J<>:4/4(@,C< (SN&,D0(/4:4;"/4$%*1$
H2
< 0/4H−2
&S(Z(#*%3&$%,'p /R/4(^(5$*(/4w< (5< (0CF+,Gp /R+1*$nADD1*9@,D@" &(/D01*< t<>00%/4< $w9HD(< $S#< (< "(K0@.< *)Fp S+1*$nA&C< 00%/4M/75:4(/410'@.<>5(: ,4D< $/Z.%^#< (< "(U*J< FW*/4"#< (0ES%q.HT#W("&JABYM9HT#W/4MC"C<@/4(V< 0T3 < &.< :4C/ 6w[^]S_N` "/+0< "$%,4&(/D01*/4/ 6Z(J< $w /4($0-#< (< "('&/d"/D0$*J< $*1$=<>%/4A
_NZ*J< 7/ 6<>/4"D 7<J3&Z/M*9/+/4V< :&< %C7%< $W*$=< w/ 6w<J3&6u1*/4/q0r\/41(P/D*.Q#< * AwP/4$$/S%:?< < (:41"'+C"$< (G/?<>/4"*V*J< 'ED*/ ETA M G*9/+/4GG/4(@/4:4/4< $%I0d<>/4"*V6u1*/4 *&(0!/4 /%A
5"/D0$/ 6WH2
< 0H−2
"/4$*1$U@,D@" ^0#*0*9"<>*J< $$%,qP:A A 4ABw(J< $#< *#< (< "( CFW/ 0$:
R<>0?;<./ "*
/4(F%.< $wI1/α
<>(/S A^)*&(/ 6ZJ< *.2/ 6N!<>/4"()<+1*$1S%*9<>(:
Z = 1A` *J< 1! )<34) /?*&.(J^ !"C<J,-$/+*J<>
;<>/4"*/4(F%.< $V/4FW/ / 6")Aq;"'#$@M*J< ;"C<J,?(@(*/41($%34/EJC/ (FO9<>$'/4$%,4A^'<J,- !:4C#< *!6u/4('1#2/E6u/41($*(/4A$/D*J<>/4E/ 6S"/4(-<!:4$ JM/ (FO9<>$/4qJ< *.-+1*$1M#W/ F$% DF1T % *(J< &=< $$%,< < $%,+*J< $0*1$%^N"*(/4*/ #*98#< (< "(S*J< $*1$=<>/4AR#< (< "(
α*/4+(/4$$%:GVIV/ 6KV/4(F%.< $
< SF!5+1< $/4FW/ / 6B")AJN<>/4"*7/4(F%.< $$/+*J<>0)/4!J< *.\/ 6 /C*&(Z/>6U0@.< *
R< #< (@7< (M/ 7/4(@/4:4/4< $nA8717ZG/4(:4%\/ 6UG*/+/4(0<>M@,D@" /4
"# + $2'#%=?3 # *!=?& $2A !)N!"# 4 *&;!= )*. .#3>= * :"$2O !# '+D3 #*#3 E-+ P'+P -,
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R
1/α
R
1/α
P:41( A 4A )/D0$/ 6UH2
< 0H−2
"/4$*1$5S%\(J< $#< *M#< (< "( 7F/40;$:
R<>07/4(F%.< $I
1/αAT7/4(F%.< $WIZ@1@:410N6u/ (
,&>W< V<>/4"*N6u1*/40/+5/ S(J< $$%,C<J3&V<G< (#)FW/4(0(A
;$*/4*:dFW/ +1*$n< $%6w<J,qFp -")AB<>/4"*'<J346u1*/45< (7/ 6B76u/4$$/S:R6u/4("
φ1(r;α) =
√
α3
πexp(−α|r−R/2|) φ2(r;α) =
√
α3
πexp(−α|r+R/2|), a A o
S(R<34*/4(V/ 6 $:
R< $/4:<HT7/ 6'"/4$*1$ AX,<J34
/CFR/4(@/4:4/4< $%I0F+,"OHT:Gw<34V6u1*/4S$/D*J<>0!< **/4(0:'/#(/D*01(N< $(J< 0T,M0*(FW0CD*/4TA 4A4?S$$T*J< $*1$=<>wS"*(/ */4#*#< (< "(C <>/4"*;6u1*/4< 02t(< @6u/4(" " /?\/4(@/4:4/8< $I0!?< (ZF< AWM"OHT:C*/+ *&79HT#(J0d[U+AUalTA &o5< 0alTA +o50#0E/4\M/34($=< #\+:4(< $
SAXG< #WG/ 6<>/4"*R< 0d?< (
6u1*/4/S)P:A8 A DA Z7*J< / *Z<>w/4(@/4:4/4< $%I0?< D8( 6u1*/4w<34<M/D0 *Z,;*< / SFWN7:4(/410;.<>N6u1*/46u/4( Z:4$Z<>/4" *J< AwwFW*J< 1Z7/34($=< #;w("/340F&,*.< :4::4/ 6/476u1*/4;V< (J<TTS(*/40!$/D*<>0 A
2 z4% #" $Z#< (< "( 00/V6u/4("G1$=<ZLN< "$%/ =< ' *J< N<34N/RFW*J< $*1$=<>0 nA,q*J< qFW0%3D00qEp /\*$=< / 98V< 0?Cw/>8
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. "$
-4 -2 0 2 4-0.2
0.0
0.2
0.4
0.6
0.8
Wav
e F
unct
ion
position r/a0
P:41() A +ANqw<J3&q6u1*/ < $/4:q"/4$*1$q<HTA5/4(@/4:4/4< $O8I0;q< ( 6u1*/4au/4$0;$o < 0;7/4(:4< $X<>/4"* Jw<J3&76u1*/4au0< 0)$o < (/S)6u/4(*/4"#< (/4 A
$*(/4!"*(/4*/4#*V#< (< "'(JA%#5$Q V%5w< N)R*J< M/ 6^<>/4"R(981$%.< &C9HT#(/4C6u/4(#< (< "(0#W0 / /4$%,-/4
αF1T;< $/?/4
&(<>/4"%*Z0@.< *RA
:4$Z$*(/4#< (< "9.(w<347/G(#(&57&(/D01*/4;/ 6w/<>/4"*R%7&/;/41(Z"/D0$nAWG6u/4(" />6G:4$98$*(/4\#< (@/ 6 LN< "$8/4=< 2dD*9(+0:4(C(#(&.<>/4 < /qF\9HD00 AsN< "$%, ^ <J34N/M< 00/RN[UAalTA &o^<(" (#(&:RN 1*N/ 6 .5*/40+1*$1
H1(r) = −∇2 − 2Z
|r− r1|− 2Z
|r− r2|,
a A 4oS(
r1 = R/2< 0
r2 = −R/2< ('0#$=< *"&V/ 6w(#W*%34$%,
r(@< 0;*/40+1*$ 6u(/4";/4(:4 A` *J< 1; <J34; //4(F%.< $(V< (7w/Q+%05/ 6"*(/4*/4#*Z:4$7#< (@*$Z#< (< "(S0r0!F&,)[UAa DA 4o9A&NF< ^6u1*/4 < (5*&(0;/4 /R0%X(+w<>/4"A+` / C*&(< (+1%3>< $&J*(V/4$%,;/4
αA<>5wS+,%S/41:4/'*J< $*1D8
$=<>Np /:4$Z$*(/4)#< (< "(@J< 0/ 66u/41(A)<>/4"*(: ,
ε′ ≡ t′11 = t′22(#(+'(:>,-/ 6Z< -$*(/4
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$/D*J<>0d/4<*&(A Y0%X(N6u(/4" <>7*J< $*1$=<.0\6u/4(7<>E<>/4" F&,!M*/4D8(F1T/4;/ 6B*/40!+1*$1
ε′ = (α− 2Z)α +∫
d3rφ1(r;α)? −2Z|r−R/2|φ1(r;α)
︸ ︷︷ ︸
2nd nucleus contribution
.a A &o
M*J< $*1$=<>%/4)/ 6Z< 00O.%/4< $*/4&(F1T/4)< 5/CFWR0/4R)#(/40< $*/D/4(0<>> &D- " *JA& C9HT#(0G D*/+/4(0<>^%^*J< CF50(*$%,3 < $1<>0)< 0)/ 6B76u/4("
−2Z∫ 2π
0
dφ
∫ ∞
1
dλ
∫ 1
−1dµα3
πe−αR(λ+µ)
2
λ− µ
R3
8(λ2 − µ2) =
= Zα
(
e−2αR(
2 +2
αR
)
− 2
αR
)
,a A +o
#(/3D0:\< $/!;*/4"#$C9HT#(/ -6u/4(M<>/4"*(: ,%q"/4$*1$=< (@,D@")S*.)
ε′ = α2 + 2Zα
(
e−2αR(
1 +1
αR
)
− 1
αR+ 1
)
.a A 4o
Y6wF< 6u1*/4V/ 6wC"*(/4*/4#*G#< (< "(VFW:)3 < $1<>0q< ($/D*J<>0?/4Ep /\0%X(&R*+(BC#< (< "(VC/\*J< $$0 /4##: >t′ ≡ t′12 = t′21
A4YU3>< $1(#(+^S*.< :4SG(: ,G/ 6 < '$*(/4'"/3D:FWw\R+1*$nnA ARQ+*V(: ,!/ 6KR$*9.(/4 AN*J< R5*/4"G8#$$%,R0%X(&K6u(/4" <>U/ 6:4$w<>/4") < 0Mw*J< />^(1ww6u/4("(9HT#(/4S6u/4(w#< (< "(S( AVJ< @Sw<J,;/'*J< $*1$=<>Z" w/"#$/,\< :&< \'#(/4$<>G#(/40< $K*/D/4(0<>A '*/40q< 0dG(0(" )[UABa' TA 4o9$J< 07("S/ 6B76u/4("
∫
d3rφ1(r;α)? −2Z|r±R/2|φ2(r;α),
a A &oS*9)< (+1%3>< $+JA,*J< )FW0(*$%,3>< $1<>0 *
−2Z∫ 2π
0
dφ
∫ ∞
1
dλ
∫ 1
−1dµα3
πe−αRλ
2
λ± µ
R3
8(λ2 − µ2) =
= −2Zαe−2αR (1 + αR) .a A $4o
Rr(@N(" \[UAUa A 4o(+1(5.R*J< $*1$=<>%/4)/ 6UR9HT#W*.<>/4\3>< $1/ 6B < #$=< *=< < 0)*J< )< $/'FW0(*$%,3>< $1<>0 < "$%,
∫
d3rφ1(r;α)(−∇2)φ2(r;α) =1
3α2e−αR
(−α2R2 + 3αR + 3
).
a A &o
69-# # :OO# *3 = 9 ; 46)':3 #(!1$2= A?. P
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. !7r< $9HT#(/4)6u/4(w/4##:'&:4(< $X
t′ = α21
3e−αR
(−α2R2 + 3αR + 3
)− 4Zαe−2αR (1 + αR) .
a A !&o
Z$=< @ #< (< "(N:4(/41#C/ 6: $5$*(/4&:4(< $^^Z/34($=< #&:4(< $
S(+1(0C/M/4FT.< N/4(@/4:4/4< $%I0q< (6u1*/4+S*.
S =
∫
d3rφ1(r;α)φ2(r;α) = e−αR(
1 + αR +1
3α2R2
)
.a A &o
Y ^"#W/4(@.< &U/V9H< "SN< @,D"#T/ *SF<3D/4(^/ 6XN#< (< "'(^6u/4("C< $$U< 7w$$^< 76u/4($=< (:4M3 < $1V/ 6
RAP/4(
R = 0/ 1(V@,D@"g1(V&/!<
<>/4" S%d+1*$17*.< (:42ZA ZdM/ (7< 0\6u/4(
R → ∞ $*(/47< ($/+*J<>0!/4! $$#< (<>0d/+0AX,!&(< *N"M1*9) J< Q4(7< 0! R9HT#W*/)(*/3&(C<>/4"*G$"'%JAXC/4##:)/4?< ?Tr%G0@.< */41$0EFW"#/4F$ T/' 9HT#W*N%/G3 < %; A[HT#$*%$%,4D$"'O< (
limR→0
ε′ = α2 − 4αZ = limR→0
t′
limR→∞
ε′ = α2 − 2αZlimR→∞
t′ = 0.a A o
,'*/4Tr(" S*/4((* / 6WSF< p8Y6u1*/4G*9/ * A&R0#W0*
/ 6BV<>/4"*Z"%*(/4*/4#*7#< (< "(/S!)P:A A TA*/40*$=< / 6B"*(/4*/4#*N#< (< "(< (NZw/G$*(/4;#< (< "G8
(AT` *J< 15 N<J3455@,D""(@,'/ 6 9HT*.< :4:V5&:4(<>/4G3 < (=< F$< 0'p /V%< (S+1%3>< $+J4(5< (S/4$%,M6u/41(Kp /V$*(/4#< (< "(A_ /4(@G*$< Or*J<>/4?/ 6"R$@0??< F$ A 4AB11< $$%,E$=< (:4@R/ 65 /R$*(/4&(< */4^^N&(<4<>/4"'*5 /41$/4"MF+(< */4
U ′ADY
N(: ,C#< $%p,G6u/4($/D*J<>: /M$*(/4S%C/4##W/4%N#C/4CN< "/4(F%.< $nA$ N6*/41( 4*/4MFW/ G*&(U(%w< " J<J34w6u1*/4 %0/+^/ U"C<>(S*.G6u1*/4
φ1/4(φ2 S1M*J< $*1$=<>/4 A4D"%$< ($O,
'&(<>/4"%*' /41$/4"MF&(< */4K ′ (#(+'+(< *9.%/4Fp
/d$*(/4M$/D*J<.0q/4q0%X(&M*&(AK$=< @Vp /\#< (< "(R0/\/ (#(&;<d*$=< *J< $*/4&(F1T/4 AK(0-#< (< "(
V ′G/>8*J< $$0
*/4(($=<>0D8/4##:/4(5+,DF(0!+:4(< $nAYN*J< dFR+(#(0d< Z</4##:C#(*!/ 6Z< / ('$*9.(/4 AUL5(!< :&<> K%G0/D/ '"C<>(M6u(/4"(1$%.< &R9HT#(/4?S(
φ1< ##WJ< ((*C< 0
φ2/4*E+:4(< $
/4(5%N5R/4##W/4%V*J< AXM$=< @Z/ MSM0(*9Z9HT*.< :4G&:4(< $J ′AWY
0%X(K6u(/4"S&(%5 /41$/4"MFG&(< */4 *SJ< *.&:4(<>/4R3 < (=< F$*/4*R< /4(F%.< $*&(0?/4/4G%MS%E< /4(F%.< $*+(0E/4E:4D8FW/ (%:'% A
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0 2 4 6 8 10
-3.0
-2.5
-2.0
-1.5
-1.0
-0.5
0.0
ε'
t'
ener
gies
,
', t'
(Ry)
distance, R/a0
P:41( A TAWD:4$98$%*(/4"*(/4*/4#*Z#< (< "(*J< $*1$=<>0V<>/4"*F< < 5<M6u1*/4/ 6&(<>/4"%*Z0@.< *
RA73 < $15< (7 ,4A
< F$ A 4A+ $=< %r*J<>/4G/ 6 "*(/4*/ #*#< (< "(K6u/4(U /V*&(%0D8*J< $K/4(F%.< $Z$/D*J<>0/4J< *9 A0r%/4d/ 6wJ<>*9E#< (< "(770/4C< *98*/4(0:V/M[U+Aa DA 4o^< 0a DA J&o9A Z$%,<R:4$S/ 6 N+1%3 < $& 9HT#(/4$@0 A
< " @,D"MFW/4$ 0r%/4/4##:
t′ < φ1|H1|φ2 ><>/4"*Z(: ,ε′ < φ1|H1|φ2 >/34($=< #S < φ1|φ1 >+(<4<>/4"'%* /41$/4"MFU ′ < φ1φ1|H2|φ1φ1 >&(<>/4"%*Z9HT*.< :4J ′ < φ1φ1|H2|φ2φ2 >&(<>/4"*7 /41$/4"GFK ′ < φ1φ2|H2|φ1φ2 >*/4(($=<>0/4##:!au&,DF(0oV ′ < φ1φ1|H2|φ1φ2 >
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. R*J< $*1$=<>/ )/ 6Kr(@N(R#< (< "(
U ′K ′ < 0 V ′ <>N!*/4""/4&:4(<>/4;/34(7r(@S3 < (=< F$
rA551S0r
I(r′;α) =
∫
d3rφ21(r;α)2
|r− r′| .a A 4o
_N$$X(#< (< "(*J< )FW9HT#(0!S%$#)/ 6I;76u/4$$%/S:R<J,
U ′ =
∫
d3r′I(r′;α)φ21(r′;α)
K ′ =
∫
d3r′I(r′;α)φ22(r′;α)
V ′ =
∫
d3r′I(r′;α)φ1(r′;α)φ2(r
′;α)a A &o
M*J< $*1$=<>/4!/ 6I(r′;α)
N/ N3&(@,\*/4"#$%*J<>0 AEG"C<J,)1MM&3&(0@.< *;9HT#< /4-#(*J< $*/+/4(0<>)anNA &o9A?<>.< *.;/4(:4q/ 6'11< $^#(*J< $^*/+/4(0<>'@,D@"
(r, θ, φ)/Gr(@R+1*$nA '<J34
6u1*/4V0r0-F&,?[UAa A o7<J3&<)34(@,?"#$< :41$=< (0#W0*J A^D/G&:4(<>/4\/34(Z< : $
θ< 0
φ#(/3D07I(/;6u/4(< $$B("ZaY5A &o
9HT*#Tw/4 +< "$%,44<>S%l = 0
< 0m = 0
A+ D'1(C0&%,)alTA 4o"C<J,FW10)/'< F$Z&:4(<>/4;/34(
r/G,D$0
I(r′;α) =2
r′
(
1− e−2αr′
(1 + αr′))
.a A +o
qS<>M6u/4$$/SV ;"M1@G(""MFW(B<>M* ;<J34;10#(*J< $*/+/4(0<>/4(:4<>%:G<>Zr(@5+1*$n
r′0/ 70@.< */ 6B#W/4&
r′6u(/4" j iz /4(:4 A&(< /4(F%.<>$U /41$/4"MF#< (< "(
U ′7/4FT.< 0"#$%,!F+,d(@:
a A oZ< 02a A +oN&/Ea A &oZ< 0E*J<>((@,D:;/4'&:4(<>/4\1:#(*J< $*/+/4(0<>ADN&:4(< $^/3&(
φ′θ′,D$0""0<>$O,M56l< */4(/ 6
4πAD
&:4(<>/4;/34(r′@(< :4&6u/4(@w< (0)< 0)< 7r< $(1$% V<J34
U ′ =5α
4.
a A 4oY+1< $/N<>/4"*(1$%9HTF%0C'_N##W0OHC]RT< U^ />8$*(/4&:4(< $ *$10ww<346u1*/ S$/D*J<>0/4/4$%,/4+1*$1A
!V*J< Z/ 6U*J< $*1$=<>%:K ′ < 0 V ′ wR<J34V/C1T$%I#(/40< $B*/+/4(p80<>&*N<> $J< @/45/ 6XSw<J3&S6u1*/4 < ##J< (:V'S6u/4("M1$=< 4
$/+*J<>0/4*+(/ <>^5/4(: '/ 6W5#(*J< $*/+/4(0<>S@,D@" 10C*J< $*1$=<>%/4/ 6
I[UABa A +o9AD?(@79HT#(/46u/4(
I&/M7*/40
< 0'(09HT#(/4 C[UA a A &oK< 0(< @6u/4(" 5/4FT.< 0'6u/4("G1$=<>U+/
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#(/40< $B*/+/4(0<>AWR&:4(<>/4)/34(φ′5@(< :4&6u/4(@w< (0\< 5%N0/+
/ w<>##WJ< (G5&:4(< 0 A&N(1$%.< &&:4(< $U*J< CFWS*J< @ +/#(/D01*/ 6<6u1*/4Z/ 6
λ< 0\/ 6
µX< 0dJ< *.d/ 6UM(1$%:C&:4(< 0NZ<C#W/4$%,&8
/4"=< $"M1$%#$%%0)F+,!< !9HT#W/4&=< $B/ 6U1" /4(N0%X(*R/ 6λ< 0
µAYZ*J<
FW*J< $*1$=<>0F&,;$"&.< (@,;"9./+0S*.,D$0
K ′ = −e−2αR
12R
(4α3R3 + 18α2R2 + 33αR + 24
)+2
R,
V ′ =1
8R
(e−αR(16α2R2 + 2αR + 5)− e−3αR(2αR + 5)
).
a A &oN9HT#(/4 < (S0%X(&^< G(^<>/4"*w*/4((#W/40< &+F1T^ 5*J< 9H< "K(< @,D"#T/ *AJ^$=< (:4U< 0V"C< $$?$"'O / 6
K ′ < (U(#W*%34$%,
limR→∞
K ′ l.t.=
2
R
limR→0
K ′ =5α
4,
a A $4oS($nA JA6u/4($J< 0:(")< V#(/4#W(V3>< $1/ 6w$"OVI(/Ar(@ $/S^5*/4((* *$=< *J< $9HT#(/ C6u/4(K5$/4:>8(< :4w&(< */4 S(VR$*(/45/4!/4(F%.< $*J< !FW(J<>0d< 5#W/4%+5*.< (:4AWR*/40$\(#(/+01*d(1$%;6u/4(
U ′<
R = 0"J< \p /-$*(/4< (
$/D*J<>0/4q;< "/4(F%.< $lAB_N< $/4:4/41$%,4;*/4((#/40:$"'OV6u/4(R+,DF(0&:4(< $< (
limR→∞
V ′l.t.= exp(−αR)
limR→0
V ′ =5α
4.
a A &o!r(@6u/4("M1$=</SC\9HT#/4+=<>$N0*J<J,t/ 6Z! />8/4(F%.< $S/34($=< # AC*/40q9HT#(/4q(#(/D01*V+(<4<>/4"'%* /41$/4"GF&(< */46u/4(< "(J< /4!< w6u/4(w#< (< "(
K ′ AS9HT*.< :45&:4(< $
J ′*J< / FWS*/4"#1T0'GS< ""C< (A4(
/71wM9HT#(/4G6u/4(I*wFW/ M+:4(<>/ V3 < (=< F$
r< 0
r′ */4*
<J34S6u1*/4^*+(0C/40%X(& <>/4"A4?S0C@J< 0C< +("0=<>9HT#(/4
I ′(r′;α) ≡∫
d3rφ1(r;α)φ2(r;α)2
|r− r′| ,a A !&o
S*9*/4+.< Xp /S0%X(+/4(F%.< $n*^%< /FWU*J< $*1$=<>077#(/40< $*/D/4(0<>A ` 1T\Z*J< GG9HT#< /42alTA 4o5*J< / 7FWG10 A@J< 0
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. 4 V<J34/"#$/,;< !< < $/4:4/41w9HT#< /4!#(/40< $*/+/4(0<>S*.S< $/'*< $$0;Vs51"C< 9HT#< /4
1
|r− r′| =2
R
∞∑
s=0
s∑
m=−s(−1)m(2s+ 1)
((s− |m|)!(s+ |m|)!
)2
P |m|s (λ<)Q|m|s (λ>)P
|m|s (µ)P |m|s (µ′)eım(φ−φ
′),a A &o
S(λ<
< 0λ>
< (N(#*%34$%,N$%(w< 0:4(J<>(/ 6λ< 0
λ′AP|m|s
< (w< /D*=<>0 :40( 6u1*/4K< M[UAalTA 4o< 0
Q|m|s< (w< /D*=<.0
:40(N6u1*/4w/ 6Z*/40Q+0 AT7[HT#< /4Ea A &o^ "/4(N*$/4$%,0*(F0!_N##W0OHNAX(@:CN9HT#< /4\+/[UAUa A !&o9/4: (S%C#(/3D0:S<J34N6u1*/4
φ1< 0
φ2+9HT#(J0;'(" / 6
λµD< 0
φX ' <>7('7/
φ0#W0*C/ 6'*.< (:4'0@(F1T/ AD/
"C<J,?*/4"#1TG#< (@G/ 65;&:4(<>/4 B(01*:/4;/ 65;1""C<>/ 0*A)X*Sw/4FT.< <>
I ′ = α3R2
∞∑
s=0
(2s+ 1)
∫ ∞
1
dλ
∫ 1
−1dµ(λ2 − µ2) exp(−αRλ)
Ps(λ<)Qs(λ>)Ps(µ)Ps(µ′).
a A oV9HDN@#!w/*J< ((@,/41TV&:4(<>/4;/3&(
µA3 < (=< F$7/+**1(5
N6u/4("G1$<V/4$%,S* AD?Z"C<,17%( Z/4(@/4:4/4< $Op,'#(/4#W(@,/ 6:40(#W/4$%,D/4"=< $%
∫ 1
−1dµPs(µ)Ps′(µ) = δss′
2
2s+ 1,
a A 4oF&,M9HT#(:
µ2 = 1/3P0(µ)+2/3P2(µ)4/4("#$%,V@S%*.'/3&(/Z9HT#$*%
#W/ $%,D/4"=< $T9HT#< /4A+^9HD &:4(<>/4G(01*^6u1(@(U51""C<>/ /34(
s$J<J3D:q/4$%, /("
s = 0< 0
s = 2A "/4@#(/4F$"C<>*
G)+:4(<>/ -/34(λAU?)1\[UAZalTA 4o9A #5T6u/4(@1<>$%,4K :40(
6u1*/4/ 6RE*/40 Q+0Qs(λ)
*/4&.< ("$Q λ+1λ−1
S*.(1$%<>6k('&:4(<>/4 K/4$"&.< (@,-*/4&(F1T/4AU)*J< $*1$=<>/4+1%*1"MFW(/4" AB %q$#/ 6;/34($=< #&:4(< $ < 0-< -< 1DHT$=<>(@,E0r%/4S ′ ≡ eαR(1− αR + 1/3α2R2)
<34V< (1$%
I ′(λ, µ, φ;α) =2
R
(1− (9/4)(µ2 − 1/3)(λ2 − 1/3)
)(S ln
(λ+ 1
λ− 1
)
−S ′Ei(−αR(λ+ 1)) + SEi(−αR(λ− 1))− αR exp(−αRλ))+9
R9µ2 − 1/3)(e−αRλ(−1/6αR− λ− 1/2αRλ2) + λS).
a A &o
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V#W*=< $ 6u1*/4)< ##WJ< (:'(w9HT#W/4&=< $&:4(< $X6u1*/4
Ei(z) = −∫ ∞
−z
e−t
tdt = γEuler + ln z +
∞∑
n=1
zn
nn!,
a A +oS(
γEuler ' 0.5772K5[U1$( ^*/4@.< &JA+S#("C< (@,M1S/ 6XS9HT#(p8
/4!a A 4o*J< $*1$=<>/ G/>6J4F1T^%U*J< < $/7FS"#$/,40G/< < $%(<>
*J< $*1$=<>/4)/ 6UM*/4(($=<>0D8/4##:C&:4(< $V/*.*.Q!R*/4@*,d/ 6
R*J< $*1$=<>%/4As59HDN R<J34V/C"M1$%#$O,I ′(r′;α)
F&,φ1(r
′;α)φ2(r′;α)
< 0+:4(<>V/41TZR3>< (=< F$
φ′µ′< 0
λ′AX_56k(7<C/4"S<>Z$: +,)*J< $*1$=<8
/4 T :4S7r< $9HT#(/46u/4(w9HT*9< :4V&:4(< $X/ 6 J/4(F%.< $
J ′ =12
5R
(S2γEuler + S2 ln(αR)− 2SS ′Ei(−2αR) + S ′2Ei(−4αR)
)
+αe−2αR(5/4− 23/10αR− 6/5α2R2 − 2/15α3R3
).a A 4o
[H< ":< @,D"#T/ *G#(/4#(@/ 6'9HT#(/4?/4'/4FT.< 79H< *$%,< "F<3D/ (S$Q Z6u/4(w*/4(($=<>0D8/ ##:'&:4(< $
V ′< "$%,
limR→∞
J ′l.t.= exp(−αR)
limR→0
J ′ =5α
4= U ′,
a A &o6u/4(S"C< $$
R V:45F< *9Q
U ′3 < $%1 W< 06u/4(S$=< (:4
R< )9HT#W/4&=< $0*J<J,4
S*9\(*NM$/4:(< :4R< #WM/ 6K J5w<J3&R6u1*/4AWR0#D8
0*V/ 6B7p /$*(/ )"*(/4*/4#*Z#< (< "(U ′K ′ V ′ J ′ 0#$=<J,40)P:A A A_N$$W6u1*/4S< (7(J< $ 3 <>$10 AYS/41$0)F@(0)<> hXm
9& v m4i C jlinm>hTz ("C< 0EC*J< $*1$=<>/4E/ 6S< $$U<>/4"%*"*(/ */4#*#< (< "(A
_56k(*J< $*1$=<>:"*(/4*/4#*G#< (< "(VC<>/4"%*GF< /40'/\.(< @6u/4(" " /d;*/4((#W/40:9HT#(/4q/4(@/4:4/8< $I0\q< %(7F< AXG:4(< $K< #WG/ 6^M(< @6u/4("C<>/ \Z0&*J< $$Q46u/4(Z<>/4"Nd[U+A^alTA &o9KalTA +o9AWG/4$%,)0%X(*M5.<ZM/3&($=< #+:4(< $w'9HT#(0 F&,< / (0#0*J!2[UANa A &o9KS*.20#0/4)R&(<>/4"*70@.< *
RA
S0#W0*GS/S\!P:A5 A DA
(< @6u/4("C<>/4(1$% 6u/4( /498^< 0 />8U$*(/4;#< (< "(w< (Z34"#$(< (#*%3&$%,4WalTA !&oK< 0!alTA "$4o9A4'r(@*J< 5<J34S/4$%,M/45<>/4"*(: ,4+*S(5^< $//4$%,G/43>< $16u/4(Kq< (^#< (< "(A&'6u/4(p8"G1$=<76u/4( />8$*(/4#< (< "(Z1""C<>/ C:4/Dw/4$%,/34( w/M/4(F%.< $,D$0:V6u/41( #< (< "(wNq< (wF< A #5T6u/4(@1<>$%,4+6u/4(
R→ 0
3 < $1/ 65)/34($=< #2< ##(/&< *.1%,4KS<>"C< Q '"OHT:d*/D *&
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.
0 2 4 6 8 100.0
0.5
1.0
1.5
V'
J'
K'
U'
ener
gy (
Ry)
distance, R/a0
P:41( A A />8$*(/4\<>/4"*Z"*(/4*/4#*7#< (< "(N<>N<G6u1*/4)/ 6KD8(<>/4"*Z0@.< *
RA3>< $15< ( ,4A
0%34(:4 AB/'<>1(7/ 6BS0%34(:4*"/4(7*$J< ($%,C%S*/4&34+S/(S(%[UAalTA &o;76u/4$$/S:R6u/4("
w1(r) = β
(
φ1(r)−(
−γβ
)
φ2(r)
)
.a A "$4o
G*/40dq< (56u1*/4\Z/4FT.< 0\F&,\9HT*.< :4:M0*1 ↔ 2
As5/
β#$=<,DK(/4$/ 6W/4("C< $%IJ<>%/4M*/4@.< +J4S(J<>^3>< $1 >6 − γ
β$$^1 / 0#N:&<>%34NQ+QGw1(r)
/41$0CFW T<>N#W/4%/4/ 6 */40qD1*$1AP(/4" P:A A ; CC<> − γ
β→ 1
S<>M"J< V%R/41$0FW'+1< $U/G6u1*/4E#J< Qd%$%6pAD/'/4("C< $%IJ<>/
β< 7./0%34(:4
<>N< "5$34$X< "OHT:*/D *& − γβ
< ##(/&< *.w1%,4A+70%34(:4D8*R*J< q"C< Q C/4"/ 6C"*(/4*/4#*'#< (< "(RTr% ABP/4(@1<>$%, B< /S;P:A- A V6u/4(:4$S$*(/4&:4(< $ < 0CP:A% A $76u/4(^p /M$*(/4#< (< "(%N5/ 5(1 AW_NN$/4:C< k jmGinS v Cj v z \<:4%34\*$=< v 7 yD% j' ++jl| 450%34(:4* *J< *$/41TJA+` 1TJ&%6W N< ##(/JHT"C<>w<>/4"*#< (< "(^/4('#1T'" +1< $SI(/Uq< ('#< (< "('"C<J,0%34(:4 AYV/ R<$%/D*J< $KX*V34(@,EJ< (7/
R = 0A?P:A A '<>
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0 2 4 6 8 100
1
2
-γ/β
S
β
over
lap,
mix
ing
coef
ficie
nts
distance, R/a0
P:41( A +A&N/34($=< #S< 0S"OHT:7*/D *& / 6<>/4"%*&/?< (
6u1*/476u/4(V<"/4$*1$M*/4@:)/ 6p / JV/4(F%.< $%Aβ*J< EFW'+(#(0
< R/4("C<>$IJ<.%/ ?*/4@.< &JBS(J< −β/γ V< "/41+R/ 6*/40<J346u1*9.%/4;/'FWV< 000/GZr(@S/47/< *.347/4(@/4:4/4< $O,4AT#< (< "(S0%34(:47S%0*(J< :0@.< *
RA
G3>< $1/ 6β< 0
γ< (G@.< (@:/(M%:4%r*J< +$%,6u/4(
R ' a0XS*.E
/ 6/4(0(R/ 6S/4#T"C< $UFW/40q$: B/4FT.< 0q$=<>(V/4qE*J< $*1$=<>/ Aw7(J< /4S&,< &,< ##(/JHT"C<>%/4;<>7$34$/ 6<>/4"*N#< (< "(/41$0!FWR*/4&(/4$$0 A% Z!R/>.(N< 0 W%55($=<>%34$%,;<>6uV/C#1TN/4"R/ 6'#< (< "(7\Mq< (7F< < < ##(/JHT"C<>$%,)I(/A'+1"(*J< $*J< $*1$=<>/4 $$1@(<>%:R#(/4F$"< (70/4)D*/4 A '/49H< "#$7/ 6Li2
"/4$*1$ A`w< :!/4ER< 1"#T/4?/4"C<J,@"C<>'C<>/4"*'#<8(< "(7/ 6UG"#$Or0\@,D@" nAX_N$$BMq< (Z#< (< "'(< (M(J< $3 < $10 < FW6u/4(76u/4(wV<>/4"*N.<>A
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H2 H
−2
-$
0 2 4 6 8 10
-2.5
-2.0
-1.5
-1.0
-0.5
0.0
t
ε
ener
gy (
Ry)
distance, R/a0
P:41( A TAWD:4$98$*(/4;q< (S"*(/4*/4#*7#< (< "(5< N<G6u1*/4)/ 6&(<>/4"%*0@.< *
RA^ /4"#< (CS%P:A A \/;; 1*/ 6S
/4(@/4:4/4< $%IJ<>%/4 A
254 &.$ 2 "$ H2 H−
2 %)< $$XV"*(/4*/4#*Z#< (< "(5< **/41&0!6u/4(Tw$*N/ VP/D*.Q48#< *C@.<>V?<;w<,4S*.?"C< Q CLN< "$%/4=<>"C<>(OHdF$/D*.Q+0=< :4/4< $nA` *J< 1NwZ<J34Z/4$%,Gp /M/4(F%.< $&(Z< (Z/4$%, (2∗2
2
)= 6
@.<> 6u/4(H2"/4$*1$5< 0 (2∗2
3
)= 4
@.<> 6u/4(^H−2
"/4$*1$=< (^/4 A+P/4(^H2
"/4$*1$ "C<,0%3D0< $$W@.<>S+/M(7(#$@.<>
|1 >= a†1↑a†2↑|0 >,
|2 >= a†1↓a†2↓|0 >,
|3 >= 1√2
(
a†1↑a†2↓ + a†1↓a
†2↑
)
|0 >, a A &o< 0;.(:4$@.<>
|4 >= 1√2
(
a†1↑a†2↓ − a†1↓a
†2↑
)
|0 >,
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"
0 2 4 6 8 100.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
K
U
energy, V,J (R
y)
ener
gy, U
,K (
Ry)
distance, R/a0
-0.04
-0.03
-0.02
-0.01
0.00
0.01
0.02
0.03
0.04
J
V
P:41( A $DAK />8$*(/4q< (M"*(/4*/4#*#< (< "('<><!6u1*/4-/ 6+(<>/4"%*S0@.< *
RAT /4"#< (SS%;PB:A% A V/RNN% 1*Z/ 6 N/4(p8
/4:4/4< $IJ<>%/4 Aw$6kK<HTB6u/4(B +(<4<>/4"'%* < 0M&(<>/4"* /41$/4"MF+(< */4
U< 0
KA'(:4&V<HT7Z6u/4(Z'*/4(($=<>0/4##:)< 0E9H+8
*9< :4&(< */4V<>0
JA
|5 >= 1√2
(
a†1↑a†1↓ + a†2↑a
†2↓
)
|0 >,
|6 >= 1√2
(
a†1↑a†1↓ − a†2↑a
†2↓
)
|0 > .a A !&o
RLN< "$O/4< anDA -$4o *J< )FW;*J< 7S(%!<>
H = ε(n1↑ + n1↓ + n2↑ + n2↓) + t∑
σ
(
a†1σa2σ + a†2σa1σ
)
+ U2∑
i=1
ni↑ni↓
−2JS1 · S2 + (K +1
2J)(n1↑ + n1↓)(n2↑ + n2↓) + J
(
a†1↑a†1↓a2↓a2↑
)
+V∑
σ
(n1σ + n2σ)(
a†1σa2σ + a†2σa1σ
)
.a A &o
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H2 H
−2
"!< Q+:7S9HT#*.<>/4'3 < $1/ 6W^LN< "$%/ < M S:4^6u/4(K(#$U@.<>a A &o9T/4$%,/4I(/'3>< $1
< I|H|I >= 2ε+K − J ∀I ∈ 1, 2, 3. a A o:4$S@.<>Ra A !&o6u/4(" <G1F"C<>(OH
HS =
2ε+K + J 2t+ 2V 02t+ 2V 2ε+ U + J 0
0 0 2ε+ U − J
a A 4o
:4&3 < $1S*J< )FJ< $%,/4FT.< 0)< < $%,+*J< $%$%,;76u/4("
ET = 2ε+K − J
ES1 = 2ε+ U − J
ES2 = 2ε+U +K
2+ J +
1
2
√
(K − U)2 + 16(t+ V )2
EGS ≡ ES3 = 2ε+U +K
2+ J − 1
2
√
(K − U)2 + 16(t+ V )2,a A 4&o
S(ET
V(6u/4$00:4(<>(#$M@.<>< 0ESx
< (C;:4$@.<>A
ES3< S< $%w<J,Dw$/ @S(: ,4+1S% 7:4(/410@.<>
EGS6u/4(
< &,;&(<>/4"*N0@.< *RA
/D/4Q+:<>')< F/4$1T3 < $1;/4<>< $$ #< (< "('< ((98+1(0 A ` 1TZ.< Q+:CG($=<>%34V3>< $17/ 6UM/4FT.< 0d(:4X%N1(7/41T<>Z<>/4"*S(: ,< N< "N*/4&(F1T/4'/M< $$@.<>
2ε< 0*J< CFW
(:&< (00E< 7G(6u(*(: ,4ABD"$< (@$%, X/4$%,!G0%X(*'FW E&(<4<>/4"%*S< 0C+(<>/4"%*5 /41$/4"MF+(< */4
U −K "#W/4(@.< &J4*V(6u(*M$34$B*J< !FWRN/C*$10/4R/ 6R3>< $1WnA AV($=<>%3&(: ,0%X(*7Fp !< &,C /G@.<><R6u1*/4;/>6
U −K T/ J< *./ 6" #< (<>$%,4AV*/4((#/40::4$:4(/410)@.<>;VP/D*.Q#< *V< 76u/4("
|GS >= 1√
2D(D − U +K)×
×
4(t+ V )1√2(a†1↑a
†2↓ − a†1↓a
†2↑)− (D − U +K)
1√2(a†1↑a
†2↓ + a†1↓a
†2↑)
|0 >,a A +o
S(D ≡
[(U −K)2 + 16(t+ V )2
]1/2.
G$/ @#D8:4$9Z:4@.<>G< < E< 0"OHD1(R/ 6^'@,D""'(%*M/4*@.<> 1√
2(a†1↑a
†2↓ + a†1↓a
†2↑)A (6u/4( /d\0%X(*\S% %(C
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$
LN< (@(98pP/D*.QN/4(L5%$(p8(/40/47< ##(/&< *9Z/H2 U*/4@(1*9Kp />8#< (@*$
<J3456u1*/46u/4(^N:4(/410C@.<>Z< **/4(0:V/VN#(*(#T/4C#(/3D00CF+,[UAa DA 4o9TS%*9)S*< .< Q S76u/4("
Φ0(r1, r2) ≡1√2< 0|Ψ(r1)Ψ(r2)|G > .
a A 4o< Q+:
Ψ(r) =∑↓
σ=↑w1(r)χσ(r)a†1σ + w2(r)χσ(r)a
†2σ
Tw/4FT.< <>
Φ0(r1, r2) =2(t+ V )
√
2D(D − U +K)Φc(r1, r2)−
1
2
√
D − U +K
2DΦi(r1, r2),
a A &oS(MG"M1$%%#< (@%*$w<34M6u1*/4\< ZFW#< (<>0&/Cw/#< (@.Z/ 60%X(+S<>1( A*/3>< $&5#< (@S
Φc(r1, r2) = [w1(r1)w2(r2) + w1(r2)w2(r1)] [χ↑(r1)χ↓(r2)− χ↓(r1)χ↑(r2)] ,a A -$4oS(J< S/4*Z#< (@S.< Q 76u/4("
Φi(r1, r2) = [w1(r1)w1(r2) + w2(r1)w2(r2)] [χ↑(r1)χ↓(r2)− χ↓(r1)χ↑(r2)] .a A "&o;(<>/)/ 6*/D *+MFW6u/4(
Φi(r1, r2)< 0
Φc(r1, r2)*J<>FW0r0
< ' h|@~9m- |q.m 2> hX|γmb
A^'3>< $1)/41$0FW)0@:410-6u(/4" zikhDx v jlin.m 2> hX| − γ
β
< ##WJ< (:qtd0r%/4 a A "$4o/ 6/4(@/4:4/4< $%I0-<>/4"*/4(F%.< $
wi(r)AK;p /+1< &%'< (;0(<JS-P:A
A TAWR"C< &,&8FW/D0T,*/3 < $*,γmb
(#(&<'(1R0:4(M/ 6U"M1$%%#< (@%*$*/4Tr:41(<>/4< $ "OHT:A
P/4(H−2
"/4$*1$=<>(7/4wC<J34C/4$%,4"M1$%#< (@%*$%'@.<>VE
P/D*.Q#< *
|1 >= a†1↑a†1↓a
†2↑|0 >,
|2 >= a†1↑a†1↓a
†2↓|0 >,
|3 >= a†1↑a†2↑a
†2↓|0 >,
|4 >= a†1↓a†2↑a
†2↓|0 > .
a A "!&o_N$$Z@.<>w*J< FW5(< @6u/4("0&/RJ< *.;/ ( F+,'Z@,D""(/ 69H+8*9< :4:VZ/4(F%.< $
1↔ 2/4(Z# ↑↔↓ AD7LN< "$O/4< 6u/4("M1$=<>%/4w0&*J< $W$Q N6u/4(
H2
"/4$*1$Ma A &o9ATLN< "$O/4< C"C<>(OH*/4@/ 6^ /;0&*J< $BF$/D*.Q+Z*/4*:M@.<> |1 > S% |3 > < 0 |2 > S%|4 > nA A
HH−2=
(3ε+ U + 2K + J t− 2V
t− 2V 3ε+ U + 2K + J
)
.a A &o
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H2 H−2
$
H2
! " !
R/a EG/N εa t U K V
# $
J
# $ 4(t+V )2
U−K
# $
%
& %
&' ( ) %
*+ + + %
% ) % ' %
,+ , %
% ( ( % (
+ + & *
+ + ) )+ +
+
%
+ %
% ) %
)+ , &-
* ) , %
* *+ &
' ( ( % % %
* , )+ %
+ ' ) )
%
& %
% % ) ) %
) &-
) %
) ) &
)' + % %
+ ) ) % *
' % , % % ( &
% '
+ %
& ) , ) %
*+ ' , &-
, ( ( %
( ) *' &
* , , ) %
&+ % (
% ' , + & )
&'
(
& %
& *' %
+ ' ) &-
% ' ( %
( % ) % &
* & ) ) %
+ ' '
, % + ( ( ,-
' ('
(
+ %
& + %
+ ( ) &-
% ( ( ( %
, (+ &
+ % %
, % *
' % % +
% (
& %
& % ) %
, % * &-
&' % ' %
* * ( &
,+ %
%
+ ) ( * + +
, % ' (
+ %
& & * %
(+ + &-
& * ' %
+ )' &
( ) ) % %
%
, ( * ) *
' )
+
& %
& & , %
(' + ) &-
& * %
+ (' &
(' ) & ' ' ,' %
* *+ %
' (+
+
+ %
& & % %
( * % * &-
& , * %
+ % ' &
( * ( ,
( ( ) , &
' ( ( *
% + +
*
& %
& & &+ %
( ( &
& % ' &+ %
+ % &
( ( ) *
) & ' &
+ & ( (
,' &
*
+ %
& & & %
( & ) ( &-
& % * %
+ &+ &
( & )+ + &
* * %
( +
)
& %
& & & % %
,+ + &-
& & , ( %
+ & ( &
,+ * (
' * ,+ &
% ( ( ( &
* % ' )
)
+ %
& & & & %
* * * &-
& &+ %
+ & % &
* * *
' + &' &
& * * &
, *
,
& %
& & & & %
+ &-
& & (+ %
+ & & * &
+
% + + % &
& ( &
% ) )
,
+ %
& & & & % %
(+ ( &-
& & ( %
+ & & ( &
(+ ( %
+ + & % &-
& % + ( &
&+ )
'
& % %
&-
& & % + %
+ & & % &
%
% & &+ &
& & ) % &
& +
'
+ % %
% &+ &-
& & &' %
+ & & % &
% &+ &
) ) + &
& & ( ( &
& % %
% &
& % %
&-
& & & * %
+ &
&
+ ( ) % &
& & % + &
& & '
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$
H−2 V J 4(t+V )2
U−K
R/a EG/N εa t U K V J
4(t+V )2
U−K [Ry]
!" # # $ !% # " $ # ! # !
! $ # !" # # $ % ! $ " # " % % ! # $ $ %
% % # !" % " $ " # $ $ % ! % % $
! " # !$ $ # " !" # $ " $ #
" ! # # # ! $ # % # % #
! " # $ ! ! ! ! " " $ "
" ! ! % # " # # % " " $ #
! " # % % !% ! # # ! "
! " " % % % " " $ #$
! ! " % $ # % ! !$ " ! % %
# " $ " " % ! $ #
# ! " # ! # " " ! !% $ ! !
$ " # % # " % $ # % $ # ! $
$ ! " # ! ! # " % ! # # # ! ! $
% " #$ # " % " % #
% ! " $ % " $ " % " ! $
" " $ # $ # % " % " "
" ! " % # ! % " % ! ! !
" % ! " " % % %
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H2 H
−2
$
0 2 4 6 8 10
0.0
0.2
0.4
0.6
0.8H
2 molecule
many-body covalency
single-particle covalency
cova
lenc
y
interatomic distance R/a0
P:41( A TA;:4$98#< (@*$%daγoR< 0"C< +,&8F/D0T, a
γmboR*/3 < $*9,q6l< */4(
6u/4(wH2
w<J346u1*/4AP/4(0.< $"C< 9HDJA
:4&3 < $1S/ 6BSLN< "$O/4< < (
E± = 3ε+ U + 2K + J ± (t− 2V ) a A o[^< *.E(: ,\Z / 6u/4$0d0:4(<>GS%(#*V/;#
σ =↑, ↓ A]N#W0:/4:4/ 673 <>$1t− 2V :4(/410)@.<>;VP/D*.Q#< *VS%(<@,D""(*V/4(N< \< &@,D""(**/4"MF<>/ )/ 6KR%< $@.<> |1 > < 0
|3 > AX_NZ%N1(Z/41TZ$=<>(N01(:CM/4#T"%IJ<>%/4!#(/+* M@,D""(**/4"MF<>/ (:4*J< $$%,N6l<J3&/4(< F$K6u/4("C< $$RS(J<>B < +@,D""9.(%*
6u/4($=< (:4(RA
` *J< 1\< < $%,+*6u/4("M1$=< M6u/4(G):4(/410@.<>)(: ,< (!<J3>< $=< F$FW/>.
H2
< 0H−2
*J< \*J<>E@1@""'%I!3>< $1S%2(#W*/α< 0
RAV$*(/4*VLN< "$O/4< */ +.< S/4$%,;$*(/4D8$*(/4)< 0
$*(/4D8+1*$ &(< */4ABD1;/ FT9<>0:4(/410@.<>;(: ,V$*(/4*S(: ,
EelG
/4$O,4A+/R*/4"#$50*(#T/4/45< ^/V*$105< < 00%/4< $*/4&(F1T/4\/ 6^M/4D8/4!+(< */ A?M(J<>7%Z*$=< *J< $$%,4W< 7 8#& $.# )24 !"# 3 # @# *# '1$&(+ G8# , $+>$. G8# A A!1$2A $2E) !
|2 >$2*3
|4 >
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$
0 2 4 6 8 10-2.3
-2.2
-2.1
-2.0
-1.9
-1.8
-1.7
-1.6
H2 ground state
H2
- states
ener
gy (
Ry)
interatomic distance, R/a0
P:41( A !TAw$3&$Z*."E/>6VH2
:4(/410 @.<>E< 0 $/ @H−2@.<>)< <?6u1*/4 / 6Vd&(<>/4"%*\0@.< *
RA /4##:$*(/4
$$%1(<>w($3>< *w/ 6H−2
/4**/4Tr:41(<>/4VS'"J< 1(:51$$:*/401*%3D%p,/ 6
H2@,D@")A
/41$/4"MF\%+(< */4!/ 6^ /;#W/4&Z*9< (:4Z$%,D:;<>ZMFW/40d0@.< *R6u(/4" J< *.)/ (AL5* 76u1$$X:4(/410D8@.<>(: ,;
EG(R,α) = EelG(R,α) +
2Z2
R,
a A 4o
S(Z = 1
6u/4(M&,D0(/4:4 AU(1$%'< (;/S< F$ A AK (6=8(* G3>< $176u/4(7(: ,< (M'FW@3>< (=<>/4< $B@"C<> "!nA @J< 0?/ 6""'%I:MF/
R<>0
α"G1$%.<>/41$%, *J< */4"#1TZ/4#T"C< $
α6u/ (
<:4%3&RA!<J, R:45
R0#W0*G/ 6KV:4(/410!@.<>R(: ,
< 0S/4(F%.< $I A+53>< $1 < (S#$/ 0P:4A- A !V< 0 A TA&(N< (('*1(@34V/4dJ< *9#$/ Z3DA
RX%*G('< (Mw/;0%X(+7:4(/410@.<>
6u/4(H−2
AUP/4(H2
;/4#T"C< $α:4/+MS%
R → ∞ /\<>/4"*3 < $1C6u/4(H<>/4")FW*J< 1VwV<34! /C#< (<>0d<>/4"AP/4(
H−2
R:45.%
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H2 H
−2
$
0 2 4 6 8 100.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
H2
-
H2
-
H2
inve
rse
orbi
tal s
ize,
αa 0
distance, R/a0
P:41( A TA Z#T"C< $B3 < $1/ 6 '3 < (=<>/ < $α#< (< "(R< V<6u1*/4E/ 6
0@.< *RAP/ ( $=< (:4
RwZN7<./ "*5$"'O
α = 1+S*953 < $156u/4(
<G&,D0(/4:4\<>/4")A
$"'O< ;+("0=<>53>< $17FW )H− < 0 H #< (< "(< w 7<34
w/'$*(/4S/4)/4<>/4" < 0)<G%:4$7/4;*/40 AC< F$ A Nw5$@US(:4 < 0'S3 <>$1/ 6XS"*(/4*/4#*#< (< "G8
(Z6u/4(H2
@,D@" S%\/4#T"%I0\/4(F%.< $S(J< \< F$ A CM< "S#(/3D006u/4(
H−2
"'/4$*1$=< (w/4 A < (&*J< $$%,4/4V/41$0)/ V<'0(< @*0%X(*'6u/4(7C/>8*J< $%$0 .m v9v % j m.&WikhDx "C<>(OHd$"+ 'w/%1<>/4A&N< "5/4$0^(156u/4(^N0(*9w9HT*.< :4Z&:4(< $ ;ak6u((/4"C< :>8*o9AWZ9HT*.< :4G&:4(< $BZ< $%w<,DN0*%34$%,!"C< $$(S< \<>N6u/4(5< &%6u((/4"C< :4%*RQ+*R9HT*9<>:4
Jkex = 4(t + V )2/(U −K)AXM3D(@1< $
&(<>/4"%*S/4##:R#(/D*$J< 0:/VN@.(/4:RQ+*59HT*.< :4< (S/41(*/ 6w:4$V<>1(/ 6w
H2:4(/410q@.<> AB
H−2
:4(/410q@.<>51@.< F$VS%!(#W*Z/R0/+*=<>/4)&/
H2
< 0e−W*/4&(< (@,/
H− *J< A+L5/ 3&(&(:4*^/ 6X1*.C@.<>SK"#W/4(@.< &KS*J< $*1$=<>:
;)'H−2
)*#N.")A?3& $2A?&A?$C!# !"#F)O !=?, $2AαGH= !" : )'E= !1$2A O# ' $C!), A = 2#F= ! G $. 3 )*#46)'
He$C!!1" #%# *3 )24 9 E.#&;!= )* ) P +P ) C!"$C! =?.# $2A!)
1116
= *.0!#$3 )24 !1$-= *@ !"# 2$2A #H46'), $2EA #+P : )E !1$2= *#3J46)':$2* # *A?$2'@#3>E$.=?. P
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$
< F$ A AT7:4(/410.<>Z(: ,EG
TFW/40;$: R< 0Z+34(7/4#TO8
"C< $ /4(F%.< $ Iα6u/4(
H2
< 0H−2
AV(6u(*3 < $1/ 6BV(: ,w6u(/4" "!nA9HT#W("&.< $ 3>< $17/ 6F/40)$: w6u(/4" nA
EG
,QRa0
αopta0 ErefG
,QRexp a0
H28 DA !-$ 4A & 4A !4-$! 8 DA ! 4A "!4
H−2
8 4A "! TA TA $!-$ @.< F$
A :AB".< $$%%IJ<>%/4?/ 6S"/4$*1$=< (&,D0(/4:4-/ (M0("%:)C1$$:*/401*%3D%p,;(/41:4
H2"/4$*1$ W<>Z/Sd*."C<>*J< $$%,;\P:A5 A !TAW
$=< @UP:A$$%1@(<>w"/+0M/ 60(":5 (:4*U/>69HT*%0G@.<>/ 6H2
F+,M"J< 1(:7 A :A w1$$:N*/401*%3D%,aunA A>3D=<H−2
+("0=<>@.<>o9A
2 d#d "> $& H2
'< $$+*J< $*1$=<>/4/N6l< ( w<34w"C< 0w< G< 1"#T/4R<><J34w6u1*/4*&(0G< (/410+1*$nAP/4(B<>/4"%*/41$0VF@1@%r0VF+,Z@,D""(@,4A` 1T 6u/4(^"/4$*1$&^"C<,G/ FWN*(@.< A&?5"C<,'< $$/26u/4( <V0#$=< *"+dFWwN*+(w/ 6/4(F%.< $W< 0% #< (&+1*$1Aw< ##(/&< *.; "G8
$=< (N/;< ##(/&< *9E1T$%I%:;1"/ 6 /4(F%.< $N/)9HT#(R"/4(G*/4"#$*J<.0<J346u1*/4U'$*(/4*w*J< $*1$=<>/4 A :TA4/76u/4(" /V0%#$< *0'^/4(F%.< $/'%"G1$=<>Z<'#/4(F%.< $nA
0J<)R$$%1@(<>0?qP:A A 4A0@.< *CFWwq/4(p8F%.< $55(01*0\/
R − 2d AWVp />8$*(/4!#< (< "(N0/C/ Z0#W0d/4G+1*$17#W/4%/4 A D/W(N3 < $1Z*J< $*1$=<>0< $(J< 0T,)"C<,!FG10?< :&< %S%!*.< :40
RA D"%$< ($O,4V/34($=< #!%+:4(< $0/DN/4$%,;0#W0d/4)VD8
(/4(F%.< $ 0@.< * /'X*5 *J< )"C< Q 7$%
U ′(·, α)K ′(R,α)V ′(R,α)J ′(R,α)S(R,α)
→
U ′(·, α)K ′(R− 2d, α)V ′(R− 2d, α)J ′(R− 2d, α)S(R− 2d, α)
.a A &&o
P/4(w&(<4<>/4"%* /41$/4"MF;+(< */4(/R0#W0* A
V%1<>/4F*/4"5"/4(*/4"#$*<>0;6u/4(V:4$7$*(/4)#< (< "98(< ,*$105Z+(< */4S%Z+1*$nAT7<>/4"*5(: ,"C<,FWR*J< $*1$=<>0\< **/4(0:/;[UAKa A &o9S%)R9HT*#T/4!<>5wR<J34RS*9HT#(/4?6u/4(7
2nd+1*$1V*/4&(F1T/4 *J<>$*1$=<>0E?[UA a A +o9D8
@J< 0;/ 6N&(< */4S%CN/ w0#$=< *0+1*$1ATZ0@.< * /M#1T
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H2
$"$
R
1/α
d d
R
1/α
R
1/α
d d
P:41( A 4A )/D0$K/ 6^<H2
"/4$*1$S%d< 00%/4< $#< (< "(d8wR0p8
#$=< *"&SFW !+1*$< 0;*/4((#W/40:*&(5/ 6B/4(F%.< $A
;w6u/4("M1$=<M< ((#W*%34$%,d< 0
R− dA)X*Sw<J3&
ε′ = α2 +2α
(e4αd + e2αR
)
e2α (d+R)+2(d−d e4αd−2αR−R
e2αd+R
)
d (d−R).
a A " +o
Z*J< $*1$=<>/4/ 6Z/4##:M&:4(< $W "/4(5(*.Q&,C( AT7%+:4(< $*J< FWw0O3D00M+/5(w#< (@ wQ+* (: ,4&< 0Rw&(< */4BS%MFW/ /41$/4"MF' $$A+ZQ+*5(: ,'w< < $%(< 0T,'*J< $*1$=<>0C[UA8 A TD< 0C /4$%,0;/M1F@%1T
R→ R− 2d AT7%+(< */4S%C /41$/4"GF $$;6l< *N<G(98*&(5&:4(< $nTFW*J< 1V <34 //4(F%.< $< 0)/47w$$n< 0:4(< $/4/ 6B" */4*0 AT?0\< +:4(< $X/ 6Bp,D#
τijk =α3
π
∫
d3re−α(ri+rj)
rk,
a A 4oS(
rirj< 0
rk< (!0@.< *6u(/4" (!0%X(&C#W/4&AF1*.Q+$%,4
, < ($/D*<>0 /4 <@(< :4+;$ w/*J<>$*1$=<>/4 *J< FW#W(@6u/4("0< < $%,+*J< $%$O,q-_N##W0OH GAK?#< (< "(I;:4/4"(@,/ 65)@,D@"F&,
a = R − 2d WM0@.< *MFWw/4(:45/ 6 ri< 0
rjX< 0dF+,
h = R/2
0@.< *7/ 6B/4(:4%;/ 6rk6u(/4" "00$%Z#W/4&S/ 6:4"&
aA
/4##:'&:4(< $ <>/4"*Z(#(&.<>/4)
t′ =α2e−α(R−2d)
3(−α2(R−2d)2+3α(R−2d)+3)+2τijk(α,R−2d,
R
2).a A &o
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$
0 1 2 3 4 5
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
αopt
displacement, d/a
0
inve
rse
orbi
tal s
ize
α opta 0
internuclear distance, R/a0
0.00
0.01
0.02
0.03
0.04
d
P:41( A DAJ^(1$% 6u/4( H2
"/4$*1$BS%"/4F$%K/4(F%.< $%A^/4#T"C< $+34(ZIZ/ 6Z/4(F%.< $
αopt< w/ *.< :40;:4%r*J< +$%,'*/4"#< (0C/M
*J< S%;rTHT0!/4(F%.< $X*&(N<>D1*$ #W/4%/4A
E1F+1+!*J< $*1$=<>/4;< (d0&*J< $7< ;6u/4("/ $*1$S% rTHT0/4(F%.< $R*&(
d = 0AZ-/4$%,0%X(*-!9HT@*/ 6'-< 00O8
/4< $B/4#T"%IJ<>%/4!#< (< "(dAW?G/4FT.< !R6u/4$$/S%:3 < $1N6u/4(5
H2"/4$*1$w:4(/410 @9<.(: ,EG = −2.3003Ry wE&34(E/4(F%.< $NI
α = 1.19001a−10V&(+1*$J< (S0@.< *
R = 1.4285a0AY6wV*/4"#< (7.%
/MZ(1$%wS%CrTHT0)/4(F%.< $% < F$ A RwZV<R$:4+ "#(/34"&wM(: ,!/ 6KM/4(0(N/ 6
0.2%/ 6UR%=< $ 3>< $1 S*9\5(#(/D01*0d6u/ (
d = 0A/4(F%.< $< (< $/)<$%$%GF%$=< (:4(XF/40?/4(@(V< 0.
$*(/4"/340d/;G"00$R/ 6^.G"/4$*1$ AW'/4#T"C< $B&3&(G/4(F%.< $I
αopt< 00#$=<>*"+
d< (/S))P:A A DATV0#$=< *"'+
d(J< *9R%V"C<HT"< $3 < $1C<C%+(+1*$J< (V0%.< *C*/4((#W/40:)/)$/ @S:4(/410)@.<>(: ,4A
/4*$%10:GS < #T(S/47"C<,C<J,<>5< $%/41:4;%0/+S/ S#(/3D0+=< $$%,' 3 < $1 6u/4(
EGH2
< 0H−2
*J< TZ"/D03&(,(< p8#< (+J^< $$/SR6u/4(<d0r%/4-/ 6N"C< &,&8FW/D0T,q*/3>< $*,6l< */4(^< G $$w6u/4(< !&(/+01*/4)/ 6R/>8*J<>$$0)"/4F$%/4(F%.< $%AM< "C< I:G6uJ<>1(V/ 6K(1$%R6u/4(/4"/4F$%/4(F%.< $%V<>R+1*$(#W$ J< *./ (V6u1(@(
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LI2
-
$!
< #< (@JDS$N7$*(/4*/4"Z*$/4(Vadw#W/4%%34o9ATw6uJ<>1(7/S
(1$%,)+1< &1"G8"*.< *J< $B<>1(M/ 6UM*/3 < $&ZFW/40 A ZF&3D/41$%,4MI(/#W/ +S"/ /4/ 6D1*$< 5/ 5FW!0*10\(R< 5/41(S"C< #1(#W/4w< /G.SV[^]_Z` w"/+0)%;"#$@ />8%7*J< A
2Li2
2LGD 4$ " *¡ $,">" R*/4"#$9HT%,/ 6KV*J< $*1$=<>/4)M[^]_Z` "/D0!(N+1%V(< #0$%,S%*(J< :M+1"MFW( / 6$*(/4AT_N$/+Z*J< $*1$=<>/ C/ 6"*(/4*/4#*5#<8(< "(6u/4(Rw<J3&6u1*/4G"/4(*/4"#$*J<>0?< JR6u1*/4KM/ <"#$9<>QA/q$$%1@(<>;!"#< *9/ 6Z\#(/4F$"G !<34!*./4 <"/4('*/4"#$*J<>0E@,D@")B< "$%,d
Li2"/4$*1$ ABD1*.q"/4$*1$'< ROH
$*(/4S/Gw0*00/'+(/+01*/4"7"#$Or*J<>/ A"C<@/4(B2< ##(/HT"C<>%/4R*/40(:5 p /7(a
1s2o$*(/4
/ 6J< *.Li
<>/4" < 7*/4(G$*(/4A ,< (M$/D*J<>0d"/4@$%,)/4d JZ$$nA?'<J34'*9/4/0(:&< (0d(70T,D< "*< 0/*$10R"g< (/4(p8"C< $%I%:;'D1*$1V*.< (:4'/4$%,4nA A1F+1+M*J< $*1$=<>%/4Z VX*%34S*.< (:4S/ 6WS+1*$1U/
Z = 1A&U*/4((#W/40^/ J^/4(F%.< $% <3&8
:#/4+^I &S*."J< U<>US+34(5IS#< (< "'(α1s =∞
4$/D*J<>0<>7'D1*$1A(@:Z3 < $1'&/;<>/4"%*G(: ,
ε′[UAa A &o7<>0
/C<>/4"* /41$/4"MFE&(< */4U ′
[UAwa A 4oN C:4R%Tr%G3 < $1A N6*/41( 4KU<Z34(@,G*(105<>##(/JHT"C<>%/4 A Z/41$0'(<>(K15< 'X*%34#W/>.+=< $n&< 0*J< $*1$=<>N:4$S#< (@*$S#< (< "(^S%C%JAD` 1T^/4#*K/41TU/ 6W*/4#S/ 6U&< 0GS< ##(/JHT"C<>/4M*./4< F$U1K/0"/4@(<>Z"#< */ 6K"/ (Z*/4"#$*J<>0w<346u1*/4/4;.7(1$O.A
D1""C< (I%:4/41("/+0$^0+*J< $/H2
"/4$*1$S"/+0$n&0*(FW0<>SFW:4:'/ 6BN < #T(S%0%X(*<>S V1 >5<>/4"*98$Q 7/4(F%.< $%w/ 6B76u/4("
φ1(r;α) =
√
α3
π(1− α|r−R/2|) exp(−α|r−R/2|)
φ2(r;α) =
√
α3
π(1− α|r+R/2|) exp(−α|r+R/2|). a A %$4o
S*J< $*1$=<>/4G/ 6WS#< (< "(^UF< *J< $$%,VS< "S< U6u/4(J^/4(F%.< $ F1T"M1*.C"/4(S*/4"#$%*J<>0 ADD/4"'5%+("0=<>(1$%^6u/4(US"/4@*/4"#$*J<>09HT*.< :4E&:4(< $
J ′<J34dId/ 6R34(< $#< :4 #(&:Adp />8
$*(/4-"*(/4*/4#*#< (< "(M6u/4(>G/4(F%.< $G< (;/S-P:A+ A TA N6*/41(CEC*J< C/ 6 >V/4(F%.< $7 < $/!<J34/!:4/!/34(V/)q< (VF< AR*/4((#W/40:#< (< "(N%)R?< (NF< N< (R/Sd\P:A5 A A /4"#< (:MS%; JS%1<>/4 T0#$=<,40)P:4A A < 0 A $DTw<>
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0 2 4 6 8 10
0.06
0.08
0.10
0.12
0.14
0.16
0.18
0.20
2s orbitals
J' V'
K'
U'
atom
ic p
aram
eter
s (R
y)
distance, R/a0
P:41( A TAU /?$*(/42<>/4"*"*(/4*/4#*;#< (< "(< <d6u1*/4/ 6+(<>/4"%*Z0@.< *
R6u/4( >5<>/4"*98Y$%Q Z/4(F%.< $AT3>< $15< (% ,4A
3 < $%1'< ($/ (K< 0q;0*J<J,qM"M1*9$/ (AKMM*J< 10F&,?*(J< 0MI / 6 >K<>/4"%*98$%%Q4^/4(F%.< $4SM*/4"#< (0VS%V JB/4(F%.< $nA
E0=< :4/4< $%IJ<>%/4 #(/D*!0/+!/ )0%X()<\<>$$Z6u(/4" H2
*J< FW*J< 1N
Li2"/D0$< ^N< "S6u/4("G1$=<%/4'ZP/+*9QG#< * A Z$%,G
#< (< "(R3 <>$1G0%X(A;(1$%*/4@:d/ 6S:4(/410.<>(: ,EG
MFW/40d$: R<>0\M/4#T"C< $3>< $1M/ 6UM&3&(MIM#< (< "(
αopt< (/S!7r(@5(// 6< F$ A +A` *J< 1R/ 6V#(/4F$"5< ##WJ< (:'V*J< $*1$=<>/ / 6V#< (< "(
<>/4"*MF< /4"C<J,\(@,\/)"#$O6k,)7.< QA'r(@V#W/4F$Op,w/G:4/4(N7&:4(< $S*.)< (70*1$%w/G3 < $1<> AT/41(*J< 7"C<,G;9HT*9<>:4+:4(< $
J ′ = 0A'< ##(/JHT"C<>%/4?1(G/41TM/dFW/D/
(< 0*J< $nAX_56k(ZG(< @6u/4("C<>/ \/;Gq< (F< Z '/4FT.< d0%3&(:4&(1$%AsN< "$%,4 C:4(/410?@.<>C(: ,E0%3&(:4&RE"C< $$
R$"'OJ
S*9"C< Q4S< )/4#T"%IJ<>%/4;/ 6B#< (< "(α"#W/4F$% A
_N/ (#/4F$%,!Z/;.< Q4GG3>< $1'*< $*1$=<>0d6u/4(<;"#$(Z/4(F%.< $nA?"C<J,(1773>< $16u/4( JS/4(F%.< $%JAD,<J347*/4((*5$"'OT*w'*J< ?:49R<FW/4106u/4(7':4(/410D8@.<>'(: ,4A#5T6u/4(@1<>$%,4X<>1(
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LI2
-
0 2 4 6 8 100.10
0.15
0.20
0.25
0.30
0.35
2s orbitals
K
V
J
U
microscopic param
eters, V,J (R
y)
mic
rosc
opic
par
amet
ers,
U,K
(R
y)
distance, R/a0
-0.10
-0.05
0.00
0.05
0.10
P:41( A AW />8$*(/4d"*(/4*/4#*R#< (< "(N6u/4(5M/4(@/4:4/4< $I0>q< (RF< M< M<!6u1*/4?/ 6&(<>/4"%*0@.< *
RABC3 < $1G< (
,4AW /4"#< (7S%)P:A A M/V% 1*V/ 6/4(@/4:4/4< $%IJ<>/ AG$6k<HTZN6u/4(5G&.(<4<./ "%*M< 0d+(<>/4"%*G / 1$/4"GF\&(< */4
U< 0KAV(:4&S<HTSw6u/4(w&,DF(0)< 0)9HT*.< :4V+(< */4
V< 0
JA
< F$ A DA&N(1$O.^6u/4(Li2
"/4$*1$wS%C0%X(&w< ##(/HT"C<>%/4 4(:&< (0D8:M#< (< "(< ##$0;/4/4#/ 6BV[^]_Z` w"/D0 A< ##(/JHT"C<>/
EG/Na,o
Raa0o
αopta09H< * 8TA "!"-$ A TA $J ′ = 0
0%34(:4& 0%34(:4+
J ′ =J3 < $1 8TA $!"$ TA " TA
J = 08TA !4 A DA
/Gq< (F< 8TA $ DA 4 TA "$
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/ 6':4(/410E@.<>'70%X(&J '@.<>GS%d'$/ @(: ,7/ < "V< w6u/4(w*/4"#$7*J< $*1$=<>/ A
+$$U<>/ (V#W/4F$O,d%/)V'3 < $1J = 0
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J = 0+nA A&/ ^34(@,:4/+/D0 A+s5/ N< $/7<>:4$*:
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0/S);6u/4("
Ze+Ne+z∑
i=1
Zexti e = 0,
a DA oS(
ZeSR*9< (:4R/ 6KR*&(.<>$+1*$1
NSM+1"MFW(N/ 6U$*(/4
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P:41(DA 4A<>#W / 6*/4"#$9HCau1##W(B(/m = 0,±1,±2 (#W*%34$%,o< 0(J< $5au$/ (7(/No7 0dw<J3&G6u1*/4AP/4(ZG*/4"#$9H\3 < $10dw<34G6u1*/4
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R3d(r;α) =
√
8
45α7/2r2 exp(−αr). a DA 4o
5*/4"#$ww<34S6u1*/4< (S/4FT.< 0'F+,G"G1$%%#$%,D%:Z5(< 0=< $T#< (@F&,G@.< 0< (0#(*J< $K0#W0*J(#(&0?F&,d#(*J< $K< ("/4*
Ylm
nA A φ3dm(r, θ, φ;α) = R3d(r;α)Y2m(θ, φ).
a DA &o` 1T5%S/ S/4$%,;*./4*76u/4(wR 06u1*/ JA,)/ 6k!< ##J< (5< 5(J<>$6u1*/4AV(J< $X6u1*/45< (70r0\< 6u/4$$/S
φ3z2−r2(r;α) = φ3d0(r;α)a DA +o
φyz(r;α) = −ı√2(φ3d1(r;α) + φ3d−1(r;α))
a DA 4oφxz(r;α) =
1√2(φ3d1(r;α)− φ3d−1(r;α))
a DA &oφx2−y2(r;α) =
1√2(φ3d2(r;α) + φ3d−2(r;α))
a DA $4oφxy(r;α) = −
ı√2(φ3d2(r;α)− φ3d−2(r;α)) .
a DA &o70*w/ 67(J< $W<J3476u1*/4w(#(&S7< #W7/ 6Z6u1*/4Vw< (@=< */D/4(0<>Z@,D@")A< #W/ 6BFW/ Q+0S/ 6 0;6u1*/40#*0\*9"C<>*J< $$%,;dP:A DA 4AX` / !*9/4*7< (R+1%3>< $+J!R<>U,G*J< FW(< @6u/4("0'&/J< *./ (^F&,'<71%.< (@,R(< @6u/4("C<>/4 < $/4:< S(VS/4$%,;/4
αA!/ 1(5*J< $*1$=<>/ R< $$/J< *.!w<J3&6u1*/4
/)<J34< E0#0+R+34(I#< (< "( /(1$%6u/4(7FW/ E"C<J,FW0%X(&JA
7r34V 0;6u1*/4TFW/ (J< $< 0*/4"#$9HX< (7/4(@/4:4/4< $n+(w/3&(p8$=< #)&:4(< $
S = 0A5SFW*J< 1R/ 6KV0%X(&Z< :41$=< (0#W0*M/ 6
J< *./ 676u1*/4AT73>< (=<>/4/ 67%+34(7I7#< (< "(w0/D/ F(J< Q'0/SC/4(@/4:4/4< $%,4A& #(&%$%6<>;< 0T3 < &.< :4NFW*J< 1N<>/4"*M6u1*/4V< (C< $(J< 0T,d/4(@/4:4/4< $%I0q< (6u1*/4AD/ 0/R/ w0/V(< @6u/4(" N#< (< "(*J< $*1$=<>0CZ<>/4"*SF< AD[U+A=alTA TTA +ow< (/>5*< (@,)S*J< A
N&(/D01*/4'/ 6X5*(@,D@.< $r$0*.< :4 /4$%,M5#W/ &=< $/ 6X5D1D8*$1AWR$*(/4D8$*(/4!&(< */4
H2(r, r′)< N@$$ V6u/4(" 6u(/4" [UA
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;)' !"# 3 #*= != )*.:$2*3 &()* 2# *!= )*. .# # :OO# *3 = 9 P
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?U*J< 7(< @6u/4(" ^#< (< "'( 6u(/4"*/4"'#$9H+8Y6u1*/47&/(J< $O8Y6u1*/ :4$98#< (@*$%ZF< 1:'7(< @6u/4("C<>%/4;"C<>(OH
A =
1 0 0 0 00 −ı√
2−ı√2
0 0
0 1√2− 1√
20 0
0 0 0 −ı√2
ı√2
0 0 0 1√2
1√2
,a DA !&o
< 07(< @6u/4("C<>/ ;(1$7
V ′realijkl =5∑
i′j′k′l′=1
Aii′Ajj′Akk′All′V′compli′j′k′l′
αi′ → αiαj′ → αjαk′ → αkαl′ → αl
,a DA &o
S(RRF(< *.Q Z/4!V(:4+5(#(&Z3 < (/4151F@%1T/45/ 6α#<8
(< "(N/FWM0/4M\J< *9d*/4"#W/4&7/ 6UM1")AX\M(J< $F< (< (V '/4I(/&:4(< $A
">2 y| $ |> (dy26(S"/D0$T S*9/+/46u/4(KS.H< "<>/4G/ 6S$*(/4'@.<>^G*(@,D@.< $r$0d%5M/D*.< 0(< $1((/410:"/D0$nAYZN/SddP:A DA DA Z\3&(@,<HTUHX,2< 0tI (!C$/+*J<>0 <?*.< (:4
Zext 2+1< $N0@.< * R 6u(/4"/4(:4% XS*.E*/4&.< *.< (:4
ZA'D1"MFW(/ 6 *(@,D@.< $O8Yr$0E*.< (:4V
D1z = 6
A ?E< (d:4/4:q/-0*1 /*J< A5P(@J /4$*(/4 *J< N = 1
A_S**/4(0:)/!*9< (:4CF< $=< *C[UAwa DA o9 C"C<,*./D/4Z = 4
< 0Zext = −1/2 A Zext "C<,;(#(&< !/JHD,D:4\/4 O2− *.< (:4V< (0\FW 6u/41(:4+FW/4(:M*$$A;7/4$*(/4*J< 77 />8#< (@*$N+:4(< $w< (
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. -$
RR
P:41(DA DA)/D0$^/ 6 @,D@"E/D*.< 0(< $^*(@,D@.< $Ur$0 A< 00%/4< $*.< (:45< ($/D*J<>0/4
xy< 0
z<HT5;0@.< *
R6u(/4" *+(A
'x
'y
'z
'x
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'y
'zx
y
z
020 === γπβα
220 πγπβα ===
P:41( DA TA S/ .<>/4E/ 6w*/D/4(0<>'@,D@" /!9HT#(R*(@,D@.< $^r$0E6u(/4"*.< (:4S/4
x< 0
y<HTS3D=<R73 < $16u/4(w*.< (:4S$/D*J<>0/4
z<HTA
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/ M00 AU` 1TMF*J< 1;/ 6Zext ; 0E<J34C6u1*/4M< (C/ RC:4D8
6u1*/4U/ 6X: $98$*(/4'LN< "$O/4< A4D/MK*J< SI/4#T"%IJ<>%/4"C< Q4Z'34d6u/4(NG:4$R$*(/4 AD*/40*J< G5<>ZS%\ /$%*98(/4
N = 2ApEV%1<>/4 C0?w/!$*(/4?&:4(< $V< 0?
*9< (:45< (7(#W*%34$%,Z = 5
< 0Zext = −1/2 ACF/ C*J< 50C/V*J< $*1$=<>5:4$98$%*(/4"*(/4*/4#%*S#< (< "G8
( < **/4(0:7/#(*(#T/4!a DA 4o9A45LN< "$O/4< G*.< :4^S%'(#W*/G.<>/4"*Z*J< V[UAalTA &o
H1(r) = −∇2 − 2Z
|r| −∑
η=±x,±y,±z
2Zext
|r− rη|,
a DA oS(
rηNG#W/4%/4\/ 6^'< 00%/4< $*.< (:4 A G3>< $17/ 6
η(#(+
;<HTG< 0qS(M*9< (:4R$/D*J<>0q/4#/4%%34/4(R:&<>%34#< (@G/ 6S<HT%JAT7r(@ /G(" ,D$0<>/4"*53>< $1AP/4( 0;w<J3&Z6u1*/4#< (< "(5< (7+1< $/
t′ij = αi(αi −2Z
3) +
∑
η=±x,±y,±zδtijη,
a DA 4oS(
δtijηw*(@,D@.< $r$0*/4((*/4;6u(/4" *9< (:4
ηA
U*/4((*/4G*J< FSJ< $%,R*J< $*1$=<>0M6u/4(η = z
A4S*J< $*1$=<>/4MK0/4#(*J<>$X*/D/ (0%<>D1:RN+34(Z0@.< *N(w9HT#< /4:4%34F+,[UA7anNA &o'0*(F0 20.< $S2_N##W0OH NA_N< $%,DI:E!#(/4#W(@C/ 6 :40(76u1*/4/47<>7Tr%Z(< /4$%,6u /4I(/("AXG(1$%Z<J34MR6u/4(" / 6^r%R#W/ (Z6u1*/4Z/ 6
α< 0
R"M1$O8
#$0!F&,exp(−2αR) < (R0=< :4/4< $!w<34R6u1*/4\0* δtijz ∼ δij
< 0< (34)S%(#W*5/G7(< @6u/4("C<>/4
η → −η AG3 < $176u/4(η = ±x <>0 ±y *J< EFW'/4FT.< 0F&,d'(/ .<>/4d/ 6 O8=< $Uw<J3&6u1*/4AB_ (/ .<>/4E*J< qFWC0*(FW0F&,?[U1$(M< :4$
αβ< 0
γS*.?*/4((#W/40E/)(/ .<>/4E<HTRI ,E< 0?< :&< EI 34(@,"MS%E(98#W*G/d< *1< $ */D/4(0<>C@,D@")A3 < $1
α = 0, β = π/2, γ = 0< 0
α = 0, β = π/2, γ = π/2"C< #)
η = z*J< M(#W*%34$%,!/4!
η = x< 0
η = y*J< A^(< 0=< $w#< (@'/ 65;w<346u1*9.%/4'G&3 < (=< &G10('
(/ .<>/4A#(*J< $< ("/4*w(< @6u/4(" ;76u/4$$/S%:Mw<J,
Ylm(θ′, φ′) =
l∑
µ=−le−ı(mγ+µα)dlmµ(β)Ylµ(θ, φ),
a DA J&oS(
dlmµ(β)< ((< @6u/4("C<>%/4q*/D *&U(#(&:d;,&8p<HTM(/ .<8
/4 +0*(FW0C0.< $C_N##W0OHLVAT` *J< 1δtijz ∼ δij
+ N*J< */4"#1T
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. "!
δtijx< 0
δtijy<
δtijx,y =5∑
i′=1
e−ı(m(j)−m(i))0,π2d2ji′d
2ii′δtijz,
a DA +oS(
m(i)^NI98p<HT */4"#W/4+w/ 6< :41$=< ("/ "+1" / 6O8Yw<J3&56u1*98
/4 AL5/ 0/+ZGLN< "$O/4< !"C<>(OH)$/D/4Q$Q GP/4(N/4M$*(/4\%ZN0D8
*J< $wS%- /4##: ;"C<>(OHHij = tij
AU %/41T')*(@,D@.< $Sr$0%0=< :4/4< $5FW*J< 1E 0 <>/4"*)w<J3&\6u1*/4< (\:4T6u1*/4C/qd/4$*(/4dLN< "$%/ =<> AWwG&(/D01*/4!/ 6^M*(@,D@.< $r$0d0/DZ/ 7*.< :4#*1( A(< $<J346u1*/4M<J34<!@,D""(@,?*/4@&GS%?/+*.< 0(< $1((/410:TAB+1RLN< "$%/ =<>ER@$$U0=< :4/4< $l< 0? 0// S0!< &,0=< :4/4< $%IJ<>%/4#(/D*01( A*/4"#$9HC6u1*/40/'/ 6u1$$%,< :4(MS%\G/D*.< 0(< $K@,D""(@,4XF1T7('Z/4$%,!/4G/ 80=< :4/4< $$98"& B@.<>S%
m = 2R*/41#$0qS%q;@.<>CS%
m = −2 A0=< :4/4< $%%IJ<>/ ?,D$0M;(J< $6u1*/4φx2−y2
< 0φxy
AUP/4(R /$*(/4 5<J34N<*$J< (U0%3D/4'/ 6WNLN< "$O/4< G"C<>(OHM+/F$/+*.Q+*/4((#W/40:/G73>< $1S/ 6B/ .< $ # < 0)I98*/4"#/4+S/ 6B7/ .< $ # A%1<>/4"$< (N/)<>6u/4(*J< / 6w$1"g<>/4" 0*10qqD*/4qTA TA+.<>ZF$/4:4:/G*$=< Z0// Z"OHXAW[K34d0VRF$/D*.Q+Z/ 7< $$@.<> < (S+(*/4*0 A+ < $$/SK6u/4(< C< < $%,+*9HT#(/4/>6< $$(: ,:4&3 < $1TS<>5"C< Q /4#T"I<>/ ;#(/D*5J< (A
G(1$%.< +7:4(/410d@.<>M(: ,d< 0\.M&3&(M%IG#< (< "(αopt*/4((#W/ 0:/'%S/S)6u/ (S/4$*(/4))P:A DA C< 5<M6u1*/4)/ 6B
0@.< *RAP/4("C< $$
RC: (/ 10q@.<>C(: ,EV$:4&$%,\0*(J< :AB
C(:4/43a0 ≤ R ≤ 4a0
C/4#T"C< $^&34(I*.< :4M%V3 < $1C+1%(< #0$%,4A>@#'*/4++1/41A>?*J< G@.<>%KF*J< 1 Q+/-S< < $%,+*9HT#(/4\6u/4(SR:4(/410\@.<>R(: ,4AX!5(:4/4
EGS
@.< (@N0*(J< :"/4('(< #0$%,4AwC(J< /4?6u/4(7FW<J3D/4(V*$J< ($%,d?S?w$/D/4Qd<>P:A DA DA&C%J4(5U5*/4"#$S/4S$*(/4C#W*9.(1" 6u/4(^/4#T"%I0
αopt6u/4(NJ< *.\3 < $1R/ 6R < 0!6u/4(NrTHT0d3 < $1
α = 1/3< 0
α = 4/3AXMrTHT0
3>< $1^*/4((#/40/< '$*(/4'/4 0'/4(F%.< $DS%/41TU*(@,D@.< $r$0 S'*&(< $ *.< (:4R+1< $w(#*%3&$%,E/
+1< 0
+4A?$"'OR/ 6"C< $$
RG/4*M*.< (:4*/4"GFRS%\<>/ 6G+1*$1V< 0X*%34$%,\*/4"#WD8<>'%Z*9<>(: '/;'(1$%.< &*9< (:4G
Z − 6Zext = +1A '/4(F%.< $Z< (
$=< (:4(XFW*J< 1αZ"C< $$( < 0E< $$B'*.< (:4V< ('0R'/4(F%.< $A Z
N*/4&(< (@,4D6u/4($=< (:4RN 1*Z/ 6B< 00%/4< $*.< (:4w$w"#/4(@.< +
< 0 7<J347/4$%,'.Z*&(< $ *.< (:4Z = +4
AD?ZZ<>wZ*.< :47αopt
;)'φi = φ3dm
G# "$ 2#%!"$C!m(i) = m
P
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< F$DA 4A(1$%6u/4( m>hX.j v m>h a3d1
*/4Tr:41(<>/4oX7*(@,D@.< $&r$0V/ 6/D*.< 0(< $@,D""(@,4A4/4#T"%I0G:4(/410G@9<.w(: ,
EG< 0G&34(
IV#< (< "(αopt
S0#$=<J,40 AV(J< $F< w<346u1*/4N< (10d< 0"C< Q457LN< "$O/4< C"C<>(OH0=< :4/4< $lA+79HT*%0;@.<>w*J< ;FWZ/4#T"%I00#W0&$%,#(/3D0:%7/SE+34(I#< (< "(
α+A'3 < $1
∆EG/ R*(@,D@.< $r$0!#$%:GS%)50#W0&Z/4#T"IJ<>%/4?au/Sα+6u/4( 9HT*%0;@.<>.o9T< 0<V:4$
αoptau:4$/4F< $
αopt0("0C6u/4(
EG/4$%,oU6u/4(
< $$ @.<>AEG
a,oαopta0 α+a0 ∆E
au" ,o∆[ au" ,o
/Sα
:4$/4F< $α 8TA TA 4 TA 4 $"$ TA -$ TA "$ 8TA TA "!! TA TA "$ -! TA $!
8TA - TA !" TA A -! "$DA "$ 8TA 4A 4-$! 4A -$ 4A -$ TA 8TA !"! 4A 4-$ 4A !"! TA "! -!TA -! 8TA $ 4A - 4A " TA ! 4A &$ 8TA ! 4A - 4A "$! !TA $ !TA ! 8 4A !" 4A 4-$"$ 4A 4 DA - DA ! 8 4A 4A 44 4A 4 4 DA " DA 8 4A $ " 4A 4 - 4A 4 4 4A !" 4A 8 4A "$ 4A 4 4A 4"$ 4A 4"! 4A 44 8 4A "$ 4A 44"!4 4A 4!4 TA -$ TA " 8 4A 4A 44-$ 4A 44 TA " %$ TA " %$ 8 4A -!44 4A 44 4A 44 TA "" TA "! 8 4A -$"$-$ 4A 44 4A 44 TA -$ TA
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. !
0 2 4 6 8 10-1.2
-1.0
-0.8
-0.6
-0.4
-0.2
0.0
αoptE
G
optimal inverse size,
opt a0
wnw
ergy
, EG (
Ry)
distance, R/a0
0.4
0.6
0.8
1.0
1.2
1.4
P:41( DA AV/4#T"I0;:4(/410)@9<.(: ,EG
< 0V/4#T"C< $W3>< $1/ 67&34(I
αopt6u/4(w/47$*(/4C7*J< / 6B*(@,D@.< $Xr$0/ 6B/+*.< 0(< $
@,D""(@,4A
*/4((#W/ 0N/V*(/4/34(ZFp \p /C$"'O%:'*J< A ` *J< 1M/ 6*(J< 0?X*%34C*.< (:4 /4(F%.< $< ("M1*9E"/4('*/4"#< *M<>(/ 10E+1*$1A
(E< (\/4$%,-p /@.<>3DF$!t\#W*(1" P:A DA DA FW*J< 1;;#W*(1" R0:4(<> AU;:4(/410@.<>;R(#$C0: (<>S(J< wZ9HT*%0;/4Z 0/41F$N0:4(<> A N6B*/41(Z%6 w #CZ#/ 6M$*(/4\M#*1(M0/+7/ Z*9< :4 AD/;!N*J< M M<34M/0/41F$Z"M1$%#$%%*%,4A+w(1$%*/4((#W/40w/MZ11< $ 0%3D/4C&/
t2g< 0
eg@.<> %$nA` *J< 1C6u/4(V/498$*(/4?*J< C%< $K@.<>M< (C0*/ 1#$0?6u(/4"
FW:4:W G*J< /4#T"%IVGIG/ 6/4(F%.< $6u/4(ZJ< *.@.<>G0#W0&$%,4AC*.< :4C/ 6
α6u/4(C9HT*%0q@.<>C0/DR/ M<>X*R:4(/410q@.<>CD8
(: ,EG
A'/4#T"C< $&34(I'< V<6u1*/4/ 6R6u/4(Z'9HT*%0E@.<>
α+V*/4"#< (0ES%E<>V6u/4(C:4(/410?@9<.>BqP:A DA TAC$"OV< (
0&*J< $nXnA A1/3
< 04/3
AFW<J3D/4(d*(/4/3&(V(:4"G$:4&$%,7 "#>)O != ,D= B$C!= )* )24 3 # @# *# '1$C!# #(9&(= !#3.0!1$C!#. +-= # A?3M!"# .$2,D# 2$2A #J)24
α+
46)'N$2A?A)24!"# , P
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!
0 2 4 6 8 10
-1.0
-0.5
0.0
0.5
1.0
α=1/3
α=4/3
ener
gy (
Ry)
distance, R/a0
P:41(DA +A'(: ,d#W*(1" S%/4#T"%IJ<>%/4 X< 0S%drTHT0αA
3 < $1α = 1/3
< 0α = 4/3
(#(+NR$"'OS%!+1*$J< (5*.< (:4Z = 1< 0
Z = 4(#*%3&$%,4A&Y^*/4((#W/40'/7S*(@,D@.< $r$0'*9< (:4^F:%(
*$100< )< X*%3&*.< (:4E/ 6R+1*$1)/4(<>)Tr%\0@.< *d6u(/ " %JA):4(/4102@.<>G(6u/4$0-0:4(<>S(J< )9HT*%02Mp /6u/4$00:4(<> A*$10:G7 /#W/4F$7#;3 < $10:4(< *,)0/41F$A
0%X(+JB< "$%,4 0/d/ M<34;<\"/+/ q0#W0*4KF1T'<\0*/4&+1D8%p,\<>
R ' 3.65a0AX?Gr0d+17G9H< *VFW/4(0(7Fp EMw/$"'O%:
(:4"AV+1"(*J< $X3>< $1S/ 6αopt
< 0α+
< ($@0;< F$ DA 4A_N/ (N&(@.%:#/4+N5V3 < $1R/>6UM*(@,D@.< $Br$0\#$%%:AY7
/SqP:A DA $D/4:4(RS%EC3>< $1R6u/4(rTHT0α = 1/3
/4(4/3
A ZR<>M?:4(.<>$3>< $1V6u/4(rTHT0
α< ('3 < $0EEC*/4((#W/ 0D8
:)(:4%/4 A"C<HT"C< $#$%:;/4F(@340qd*(/4/3&(VFWw?(:4"A 1@<>6k(V*(/4/3&(M <>M#$%%:)6u/4(R/4#T"C< $
αopt3 < $1S$:4+$O,$=< (:4(w< )<>S6u/4(α = 4/3
A5SFW*J< 1VV/4#T"%I0:4(/410E@.<>'(: ,< $%<J,D$/ (7< ':4(/410E@.<>'(: ,d6u/4(ZrTHT0αW< 0)R*(/4/34(Z/ 6R:4(/410).<>V(: ,)5"/+/ (S< )V*/4((98
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. !4
0 2 4 6 8 10
0.4
0.6
0.8
1.0
1.2
1.4
ground state
excited state
optim
al in
vers
e si
ze
opta 0
distance, R/a0
P:41( DA TA45/4#T"C< $D3>< $1^/ 6WS&3&(SIS#< (< "(α6u/4(KS:4(/410
< 0Z9HT*%0@.<>w3DA%+(/4%*N0@.< *RAT79HT*%0;@.<>7#$/ w< <
0*/4&+1%p,4DS(J< S:4(/410)@.<>70#W0*JV"/D/ A
G(1$%Z6u/4(Nw/;$*(/4a3d2
*/4Tr:41(<>/4oN< (M/SP:ADA TA(< (
45@.<>V0#$=<J,&0?< R<;6u1*/4E/ 6w0@.< *
RA:4(< $
< #WV/ 6BV:4(/410)@.<>VS"%$=<>( ./GV/4$*(/4!*J< AW` *J< 1V/ 6$*(/4D8$*(/42+(< */4 K\/4(F%.< $< ( z2C = v9ACCF*J< 1\$*(/4U(@,R/V(:&< MS(: ,'F&,G*(J< :Z5<>(< */4M/D1*$1A5*J< !FWV\!+1"(*J< $ 3 < $15#(&0d)< F$ DA DA` *J< 1M/ 6"C< $$%(wI7/ 6/ (FO9<>$D7*(/4/3&(.< Q 5< $/G#$=< *Z6u/4(w"C< $$(
RA
6uJ<>1(7w#(*V/ 67Q+Q6u/4( 79HT*%0@.<>S%7*(/4/34(S(98:4/4 A]N#%R%*(J< :0@9<>*R/ 6R< 00%/4< $ :&<>%34V*.< (:4(: ,< $/'(A
/E$*(/ -@.<>'*J< -F;*$=< %r0-q("G/>65/ .< $ #-< 0-%I98*/4"#/4+JA,d< (R: /D/D0!+1< &1" +1"GF(N6u/4(SN@,D@")W%6KR#D8/4(F%G+(< */4G:4/4(0 U< '%'M*J< )/6l< (AUL5:4-#-.<>GS%S = 1
< (7$/ (A:4(/410@.<>76l< $$ +/M*$< JA,<J347(#W/4p8F$w3>< $1^/ 6
Sz = 0,±1A+P/4(UJ< *.C/>6X" (5< ((S0:4(<>5$/ @
@.<>AXG*/4"#$R#*(1" 6u/4(NJ< *9Sz
N0+*J< $nAWD/M:4(/410\@.<>
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!
0 2 4 6 8 10 12 14
0.00
0.05
0.10
0.15
0.20
0.25
α=4/3
α=1/3
crys
tal f
ield
spl
ittin
g (R
y)
distance, R/a0
P:41(DA $DA *(@,D@.< $Tr$0G#$%%:56u/4(K/4w$*(/4GG< G/D*.< 0(< $T*(@,D@.< $r$03DA0@.< *
RAS*/4((#W/40S/'(: ,#W*(1" /!!P%:ADA DADP/4(U5< Q4N/ 6 */4"#$+ N*$10N*/4((#/40:M#$O%:4U6u/4(
α3 < $1S#W*Or0 A
6u/4$00:4(<> A_N/ (53 < $1R10\/*$=< %r*J<>/4!/ 6UR@.<>Z5G< :41$=< (5"/4"D8
1")A#5T6u/4(@1<>$%,Z%/ <S:4/+/D0+1< +1" +1"MFW(6u/4(*(@,D@.< $&r$0V@,D@"A'@.<>7/4FT.< 0d\'< FW/34'#(/+*01(< (G/ 7:4@.<>7/ 6
L2 /4#(p8<>/4(AXG/4$%,):C<>7*J< FWM0/4GNG*J< $*1$=<>%/4\/ 6UG9HT#W*.<>/43 < $1/ 6 < :41$=< (7"/4"&1" /4#W(<>/4(A]N#W0:)/4:4(/410E@.<>$*0 *G,E< (G6u/4$00:4(.<.>w':43>< $1d'd'D8(@3 < $6u(/4" $/ !TWS<>*/4((#W/407/< :41$=< (N"/4"&1" FW < 0TA9H< *5%I/ 6B+(@3>< $ 0#W0N/4
RA
54 bd6( *d " 6( " " (D/\6l< (R/41(M*J< $*1$=<>%/4?*$100< $$/4D8($=<>%3D%@*&(< */4R?;P/D*.Q#< *w#< 0MF+,*$=< / 6 0Vw<J3&6u1*/4A_NM9HD/4M/ 6B"/D0$+S*$1/4G/ 6X/4"($=<>%3D@%*wX*A+S*/4+(F1T/4M < &^/*$10
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. !
0 2 4 6 8 10
-3.5
-3.0
-2.5
-2.0
-1.5
-1.0
-0.5
0.0
Ene
rgy
Spe
ctru
m (
Ry)
distance R /a0
P:41( DA TA[U(: ,;#W*(1" 6u/4(p /'$*(/4w7/D*.< 0(< $X*(@,D.< $Xr$0S%E/4#T"I0E+34(CIC#< (< "'(
αAC(1$%R< (0&*J< $KS(
G1'(J< $K/4(Z*/4"#$9Hd 0d@.<>A_N$$$*(/4D8$*(/4d&(< */47< 0\#D8/4(F%K+(< *9.%/4M (5*$%100!auS0*1/4'/ 6WS$< @^&(< */4FW$/No9A#D8/4(F%*/4((*/4/S?EP:A DA 0/DV/ V+1< $%.<>O34$%,*.< :47#*1( FW*J< 1V/ 6%"C< :4%10 A
SR#D8/4(F%5*/41#$:A_N$$R*J< $*1$=<>/ 51#!/5#W/4&N@.< (@0!S%7D*9(+0:4( +1<>/4 AT` *J< 1Z(N /M"C< &,&8#< (@*$5]N(< *N+1<>/4 <34;/*/4++1;<J,-< $(J< 0T,q*9/4 A^w)#D8/4(F%G&(< */4/GFW7*$%100)< <M*/4((*/4;/'LN< "%$%/4< da DA o9AT*/4((*/4;&34/4$%3&/4$%,2:4$\$*(/4 (")wF*J< 1?%;/4(:4<>C6u(/4" <-:4$.8#< (@.%*$%6u/4("C< $%"ATYSS*J< $*1$=<>0_N##W0H).AYS/ 6B76u/4("
H ′(r) = α21
r
∂V sph
∂rL · S+ α2
∫
d3r′2ρ(r′)S · ((r− r′)× p)
|r− r′|3,
a DA 4oS(
α = e2
~c ' 1137
7rC@(1*1(C*/4@.< + AV sph C#(*J< $$%,
@,D""(*#< (@/ 6N)$*(/4@.<>*#W/ &=< $nSG)#2/4#W(<>/4(
L
. *$C!),D=?&*= !1. !"# = * 2# '1.# )24 !"# *# .0!'&;!'# &()*.0!1$2*!H=?.8!1" # .O# #3>)24 A = @"!cP
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ρ(r′)%
(01< $^*9< (:40@(F1T/4/ 6 C#< (@V/ R*$100?#W/ &=< $V sph A
_NU*J< 'FW'6u(/4" [UAWa DA 4o9>#D8/4(F%K&(< */4R(" #< (<>^&/p /!#< (@ C#(*J< $#< (@VS*.q:4%34VC< "'/)C&(< */4 < 0<M/4D8#(*J< $X*/4+(F1T/4 &S*9;"C<J,CFWZ/ 6B*/4"#< (< F$N"C< :4%105/Mr(@S(")< 0+15*J< / SFW:4/4(0 A
/ 98$*(/4E"*(/4*/4#*G#< (< "(tij0r0qF&,[UA a DA 4o9 *J< $O8
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H ′sij =< i|H ′s|j > H ′ns
ij =< i|H ′ns|j >, a DA &oS(C1#(*(#T
s<>0
ns0/ (#W*%34$%,#(*J< $ < 0E
/4D8#(*J< $X#< (@A` *J< 1/ 6( 0%X(+w<>1( T,C<34N/GFWZ*J< $*1D8$=<>0#< (<>$%,4A
_N/ (5"#W/4(@.< &5#W/4&S/C/ RS<>5R*/4((*/450// N*/4(@34d# AwL5*\dLN< "$%/ =<>2/ ;#D8(/ .<>/ t&3>< (=< +< &,t"/4( AP(/4" ;#W/4&; E1d zWikh5m v ~ikjY z\ikhTzj tm10 m v ~ikjY z AwD8*(J< G3>< (=<>/4\(.<>:4'/ 60*
i< 0
j< 76u(/4" / /4,d*$10
< $/!# |i >≡ |iσ >AC"#$%6=,D:)< 1"#T/46u(/4"D*/4 DA CV/
$/4:4(1 A#(*J< $$%,E@,D""(*C#< (@MM($=<>%34$%,J< @,?/\*J< $*1$=<> A?"C<,
S(%77%=< $W+: (.<>$^a DA &ow< H ′ssσtτ =
∫
d3r(φsξσ)?H ′s(φtξτ ),
a DA $4oS(#;6u1*/45< (
ξσ =
(10
): σ =↑
(01
): σ =↓ .
a DA &o51S0r(< 0=< $X#< (@5/>6#<>(.<>"(5<
ζ(r) = α21
r
∂V sph
∂r.
a DA !&o)*/ "#W/4&'/ 65#-/4#W(<>/4('< (;9HT#(J02F&,q < 1$w"C<>(*Sη = τ η/2
ASE*/4"#/4+/ 6R?< : 1$=< (;"/4"+1" /4#W(<>/4(;*J< FW9HT#(0\<'"#$N6u/4(" #(*J< $*/D/4(0<>
Lx = ı
(
sinφ∂
∂θ+cosφ
tan θ
∂
∂φ
) a DA &o
Ly = ı
(
− cosφ ∂∂θ+sinφ
tan θ
∂
∂φ
) a DA oLz = −ı
∂
∂φ.
a DA 4o
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. !-$
#5:GV< FW/340r%/4w73 < $17/ 6H ′s *J< )FW9HT#(0d<
H ′ssσtτ = Ξ(αs, αt)
∑
η=x,y,z
SηστLηst.
a DA &o#)#< (@S@1@N<M(#$Z#(/D01*5/ 6Bw/'#/4(5< 0!<G"C<>(OH
Sηστ = ξ?σSηξτ .
a DA +o< :41$=< (B#< (@UBw9HT#W*.<>/4M3 < $1 / 6< :41$=< ("/ "+1" 6u/ (K:4%34/4(F%.< $
Lηst =
∫
sin θdθdφY ?2s(θ, φ)LηY2t(θ, φ),
a DA 4o< 0;.+1(< 0=< $X#< (@5
Ξ(αs, αt) =
∫
r2drζ(r)R3d(r;αs)R3d(r;αt) = −32
15α2Z
α7/2s α
7/2t
(αs + αt)4.
a DA &o;$=< @G(1$%Gw< '/4FT.< 010(M< 1"#T/4q<>G) /41$/4"MFq#W/>8&=< $
V sph(r)/4(:4%<>6u(/4" *9< (:4
+ZA _N$$5d< FW/34d9HT#(/4*J<
FW*/4"#1T0-<\@(< :4&6u/4(@< (0q"C< (JA ;*J< $*1$=<>/ q/ 6;/4D8#(*J< $5#< (@C"/4()*1"MFW(/4" A2/41(C"/+0$50#*0ttP:TADA E< $$*.< (:4Z9HT*#T7<>Z/ 6UM*&(< $D1*$17< (R*$100\!R*9< (:4R0@.(O8F1T/4
ρ(r′)A` *J< 1wV< (0J< $:MS%;V#/4+S*.< (:4V0@(F1T/
S<G1" / 6K]N(< *70$%.<M6u1*/4nA A
ρ(r′) =∑
i=±x,±y,±zZextδ(r′ − ri).
a DA "$4oM*J< $*1$=<>/4)*J< dFWM#< (<>0d+/p /;#< (@Nd<C"C< (Z"$<>(S/C#(*J< $*J<
H ′nssσtτ = α2
∑
η=x,y,z
Sηστ∑
i=±x,±y,±z(Ii)η,
a DA &oS(
i0*J<> U*.< (:4^Z^/+*.< 0(<S1((/410:ww^< (^0< $:wS%
< 0ηN*/4"#W/4&w/ 6 34*/4( 3>< (=< F$A+N34*/4(
Ii*J< FZ3>< $1<>0C6u/4(
i = +zWS%*9\"J< 5M*.< (:4R$%,D:C/4!
z<HTN!R0@.< *
R6u(/4"
/4(:4%;;#W/4%%3470(*/4
I+z =
∫
d3rφ?s(r)2Z
|r− r+z|3((r− r+z)× p)φt(r),
a DA !&oS(
r+z = (0, 0, R)AV"/4"&1" /4#W(<>/4(S;V#(*J< $*/+/4(0<>
< 76u/4("ga~ = 1
o
p = −ı
sin θ cosφ ∂∂r+ cos θ cosφ
r∂∂θ− sinφ
r sin θ∂∂φ
sin θ sinφ ∂∂r+ cos θ sinφ
r∂∂θ− cosφ
r sin θ∂∂φ
cos θ ∂∂r− sin θ
r∂∂θ
.a DA &o
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1
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∞∑
l=0
R−3,l(r, R)Pl(cos θ),a DA o
S*9)SV#*=< $*J< R/ 6U[UAKanNA 4o9AR−3,l
5<'(<>/4< $X6u1*/4!/>6U%< (:41"+A
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P/ (^FW/ #(*J< $W< 0/4D8#(*J< $#< (@/ 6X5#D8/ (FO^&(< */4G /4FT.< q9H< *9< < $%,+*'6u/4("M1$=< AqC$"O
R → 0/4D8#(*J< $#< (@
:4/DR/34(R+/C#(*J< $/4 AB_NR%R%R#(/4#/4(@/4< $K/).*9< (:4Z
/4FT.< <;*/4&(F1T/4\/ 6G/4(0(7/ 6(∑Zext)/Z
XS*.E%*J< G/ 6 /4'< 0p /R$*(/4^(#W*%34$%,
75%< 0
80%#W(*&JAD
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RR&(@3 < $TFW
3a0< 0
4a0"C< :4%10 / 6/4D8#(*J< $
#< (@ZN< ##(/JHT"C<>$%,;R< "6u/4(N&34(MIR+1< $B/α = 1/3
< 05%
/ 6%=<>$W3 < $1Z6u/4(
α = 4/3A
76u/4(" / 6BLN< "$%/4=<>;"C<>(* 6u/4(w*J< $*1$=<>/4"M1*9"/4(*/4"#$*J<>0 AWP/4(Z/4M$*(/4\*J< %ZN@.%$$B#W/4F$V/;/4FT.< \< < $%,+*R9H+8#(/4 6u/4(N:4(:4AP/4( /G$*9.(/4D% / w#/4F$Z< &,C"/4(< 0)/4< /'(/4(@S/<G+1"(*J< $ 0=< :4/4< $%IJ<>%/4 A
):4(< $6u/4(" / 6N)(1$%<>6k('*$10:d)#/4(F%&(< *98/4'0/D/ *.< :45:4%r*J< &$%,4A450%X(*5Fp CSp /V*J< 6u/4(<\:4$$*(/4%M/SP:A DA !TA#D8/4(F%R&(< */4?%6kR:4(/410d@.<>GF&,d<C3 < $1M/ 6^/4(0(7/ 6
10−4/ 6^G%< $3 < $1 AXG*.< :4G
/4#T"C< $αopt
< $/V/ :4%r*J< &JA+wZ"C< '0%X(*NUN$%6k%:/ 6
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. !"!
0 2 4 6 8 10-0.14
-0.12
-0.10
-0.08
-0.06
-0.04
-0.02
0.00
∆EG
∆αopt
opt a0 (10
-3)
EG (
mR
y)
distance R/a0
-0.05
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
P:41( DA !TA < :4Z%CN:4(/410D8@9<.N(: ,CZ/+*.< 0(< $X*(@,D@.< $Wr$06u/4(<:4$$*(/4
3d1*/4Tr:41(<>/410(^S 1*N/ 6XS#D8/4(F%
*/41#$:A^d0%X(*\t\/4#T"%I0t:4(/410D8@.<>!(: , < 0 2/4#T"%IJ<>%/4;#< (< "(
α/S A
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RA Z5<>*/4&(F1T/4$=< (:4(
6u/4( $< (:4(RSZ$*(/4< (N$/D*<>0*$/4(/RZ*&(AZ+1"(O8
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/4*$10:?F(, < #T(/4!"C<J,<J,<>C \<J34\/St[^]_Z` S"/+0!6uJ< F$O,;)R%1<>/4S\ R*/40(Z< d<>/4" \< X*%34C#W/ &=< $U/ 6wC1((/410:\<>/4"V<>R< /4*J< $ AC34/4$1T/4E#(/3D00< U<N6u1*/4G/ 6W&(<>/4"%* 0@.< * A4_N$%/T>< "w"/D0G*J< GFW< ##$0\/;'< (F%(< (@,
3dn*/4Tr:41(<>/4\S%
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< F$ DA DAB(1$%V6u/4( j ' m.j v m>hTz ?C*(@,D@.< $r$0 AB/4#T"%I0:4(/410 @.<>d(: ,
EG
<>0 \+34(dI\#< (< "(αopt
0#$=<J,40 A[U$*(/4\8S$*(/4E< 0d'#D8/4(F%Z&(< */47< (G*$100 AXG3 < $1∆EG
< 0∆αopt
/ ;0%X(*;FWw-;0%#$<,40q3 < $1G< 0*J< S%/41T#D8/4(F%&(< */4 AR EG
a,o∆EG
au" ,oαopta0 ∆αopta0
a10−3
o 8TA "$ 8TA 4"!4 TA TA ! 8TA 8TA "! & TA 4 TA $ 8 4A "!4-$ 8TA -$! 4A &! TA 8 4A -$$ 8TA $"!"! 4A 4 TA "!-$! 8 DA 8TA !"$! 4A TA ! & 8 DA 8TA " 4A " %$"$ TA $ 8pTA "! ! 8TA 4 4A %$ TA -!-$ 8pTA 8TA 4"!"! 4A --$ TA !! 8pTA %$ 8TA -! 4A -! ! TA 4 8pTA 4 8TA "$ 4A -! TA -!
:'LN< "$%/ =<>"C<>(*P/D*.QC#< *7S$$XFW7/ 6:4(w0"/4 AP/4(9H< "#$ +6u/4(
N = 3$*(/4 N$$<J3& (10
3
)= 120
(N$*(/4@.<>w/41(P/+*9QZ1F#< * A _N$/J(1$%B*J< RFW < ##$0/Sp /5*/4*( %1<>/4AP(@JJw*J< M*/4"#< (U #(&K(1$%BS%V"J< 1(0M*(@,D@.< $+r$0V#$%:6u/4(7)/ R1$=<>/4(7*/4&.< :
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.
0 2 4 6 8 10-0.3
-0.2
-0.1
0.0
0.1
0.2
0.3
0.4
GS
EG (
mR
y)
distance R/a0
P:41( DA TA45#D8/4(F%U&(< */4'*/4((*/4!au0%X(*SFWw5D8(: ,!/ 6 <@.<>RS%< 0\S%/41TZ B)("Z\GLN< "$O/4< ow6u/4(Nw/$*(/4Mq/D*.< 0(< $ *(@,D@.< $ r$0q6u/4(M< $$
45@.<>AK;$M< (#$/ 0
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vZ[jM PdO@I
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! < #T( R */40(S<M*$1@(*/4"#W/40/ 6K<M*+(< $<>/4" S%; $$$/D*J< $%I0G+1< =<>/4"%*
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(n = 1, 2)4M5 /41$/4"MFMr$0G/ 6X< /4^< (p8
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1√1− 2xt+ t2
=∞∑
l=0
Pl(x)tn, |t| < 1. au_RA o
,R< ##WJ< (B &34( 0@.< *9HT#< /4 >nA A"G1$%%#W/4$%U9HT#< /4< 0d\"C< &,)/ (Z#&,D*J< $K@,D@" A :AWM9HT#(/4Z6u/4(N+,D0(/4:4D85<>0&,D0(/4:4*98$Q4Nw<J3&76u1*/4AV< /D*=<>0 :40(76u1*/42
Pml
< (*/4*0)/G :40(V#/4$%,D/4"=< $%wF&,
Pml (µ) = (−1)m(1− µ2)m/2
dm
dµmPl(µ), m > 0,
au_RA 4o< 0;6u/4(:&<>%3&
mF&,
P−ml (µ) = (−1)m (l −m)!
(l +m)!Pml (µ).
au_RA &o
/4(@/4:4/4< $O,C< 0;7/4("C< $IJ<.%/ *(%(=<TDS0$%,C10)< 5<M/D/ $/ 6(01*:GTr%7(
∫ 1
−1Pml (µ)P
mk (µ)dµ =
2
2l + 1
(l +m)!
(l −m)!δlk
au_RA +o
M*/4"#$9H)#(*J< $B< ("/ *Ylm(θ, φ)
*J< \FR9HT#(J0%)("N/ 6V< /D*=<>0 :40(6u1*/4
Pml (x)
< w6u/4$$/S
Ylm(θ, φ) = βlmPml (cos θ) exp(ımφ),
au_RA 4o "# +F$2'#8!"#H.)A != )*. )24)*# )24!"#:.# O$2'1$C!#3 O$2'!1. )24:# A ,D")A !BH# $C!= )*F= * .O"# '=?& $2A&()-)'13 = *$C!#. P
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.
S(βlm
<V/4("C< $%IJ<>%/4'*/4@.< +JA+CN*J< 5w5w< & " /V6u1$%r$/4("C< $%IJ<>%/4;*(%(/4
∫
σ
Ylm(r)Y?l′m′(r)dr = δll′δmm′ ,
au_RA &ow<J34/'S" <
βlm =
√
(2l + 1)(l −m)!
4π(l +m)!.
P(/4" V0r%/ S%SSJ< $%,C/0(%3& <>S6u/4$$%/S:G@,D""(@,($=<8/4/4$0
Y ?lm = (−1)mYl−m,
Y unormlm
? = (−1)m (l +m)!
(l −m)!Y unorml−m
Ylm(r) = (−1)lYlm(−r).au_RA $4o
Y unormlm
@.< 0('6u/4(Z'/ V/4("C< $%I0#(*J< $U< ("/4*ZS%βlm =
1AP/4(C6u1(@(0.< $(:&< (0:q :40(d6u1*/4< 0 #(*J< $< ("/4* +5 nA
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SijA+?Z0=< :4/4< $%IZ/3&($=< #C"C<>(OHF&,<R1O8
.< (@,C(< @6u/4("C<>/ "C<>(OHO1*.<>
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(/D/>V< 0E&3&(@7'/4FT.< 00=< :4/4< $$"&< 0E0/;'+34(O(< @6u/4("C<>/ ATw<J, V0r
S−1/2 = O(O†SO)−1/2O†.al`NA o
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n^S*. <J,DC<>
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"#$Or .7/4(@./ :4/4< $IJ<>%/4#(/D*A
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\ ~O@I:R|O ]ZQRbPL[N\ZX_O Ogf M`[N\ZR2Q;KW\ZR
7 '/ 6kE1'9HT#(/4V&34/4$%3D:;#W/ (V/ 6'&3&('0p8.< *MFW dp /#W/4&AWd#(*J< $*/+/4(0<>W$Z1Z0rM /;#/4&r = (r, θ, φ)
< 0r′ = (r′, θ′, φ′)
WS%d<(6u(*G#W/4&7<>7<*/4""/4!/4(:4 AG&3&(M0@.< *MFWw
r< 0
r′N:4%34dF&,!R $$O8Q+/S:40(
9HT#< /4 KS*./ (%:4<>M0(*$%,E6u(/4":4(<>:\6u1*/4au_RA oR/ 6 :40(V#W/ $%,D/4"=< $%T< "$%,
1
|r− r′| = r−1>
∞∑
l=0
(r<r>
)l
Pl(cos^(r, r′)),
anNA oS(
r<< 0
r>< (Z7"%"M1" < 0"C<HT"M1" / 6
r< 0
r′AV< :4$NFW98
p M34*/4(r< 0
r′B/ 6kM/ 34(@,R*/4&3&&UV *J< $*1$=<>%/4F1T
%*J< FW59HT#(0;F&,G5*/+/4(0<>/ 6XJ< *934*/4(1:S(:4/4/4"'(%*0+%,
cos^(r, r′) = cos θ cos θ′ + sin θ sin θ′ cos(φ− φ′).anNA 4o
/4"GF%:+1<>/4S%R[UATanNA o /4FT.< /4F<>%B/ 6D < 00%/4/4(" 6u/4(J:40(6u1*/4
1
|r− r′| =∞∑
l=0
l∑
m=−l
(l − |m|)!(l + |m|)!
(r<r>
)l
P|m|l (cos θ)P
|m|l (cos θ′)eım(φ−φ
′).anNA &o
M9HT#< /4qVS0$%,E10?C0("<>/4?/ 6w"*(/4*/4#*#<8(< "(S;A
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|r− r′|−2ν = r−2ν>
∞∑
l=0
(r<r>
)l
Cνl (cos^(r, r
′)),anNA +o
"
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"!S(
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1*.!9HT#< /4/ -!
|r− r′|n =∑
l
Rnl(r, r′)Pl(cos^(r, r
′)).anNA 4o
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′)6u1*/4A&B/V0rS"
0!/4"7#($"%< (@,C0r%/4AP(@J
(α)s = α(α + 1) · · · (α+ s− 1) = Γ(α+ s)
Γ(α)
anNA &o B/D*.< ""(S@,D"GF/4$nS(
ΓM[U1$( < ""C<M6u1*/4 AWD*/40
< 1 &,D#W(:4/4"(*Z6u1*/40r0\<
2F1(α, β; γ;x) =∞∑
s=0
(α)s(β)s(γ)ss!
xs.aY5A $4o
Y6'< (:41"&α/4(β< (M/4D8#W/4%%34M&:4(XG&,D#W(:4/4"(*
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< F/349HT#(/4Sw*J< S(%70/S76u/4("G1$=<
Rnl(r, r′) =
(−12n)l
(12)l
rn>
(r<r>
)l
2F1(l −1
2n,−1
2(n+ 1); l +
3
2;r2<r2>).
anNA &o
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Tr%Z(
2F1(l +3
2, 1; l +
3
2;r2<r2>) =
∞∑
s=0
(r2<r2>
)s
=1
1− r2<r2>
,aY5A !&o
S*.C6u/4(@1<>$%, <R:4/4"(*5(< 0*J< FWZ(*J< @w+/M<R*$/ 06u/4(")A(9HT@M< $/!<)@,D""(*0r%/4E/ 6
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ν = 1/2!"# + $2'#:!"# .$2,D#P
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α1 . . . α5A
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ijkl0*N$J< 0!/M< "
#< (< "(A_N$$ /4+1%3>< $&5/4I(/Vijkl
$"&5< ($@0;FW$/
V1111 =5α14,
V1112 =16α1 (α1 α2)
32 (33α1
4 − 7α13 α2 − 43α12 α22 − 21α1 α23 − 2α24)(α1 + α2)
3 (3α1 + α2)4 ,
V1212 =α1 α2 (α1
4 + 5α13 α2 + 6α1
2 α22 + 10α1 α2
3 + 2α24)
(α1 + α2)5 ,
V1313 = α35
(
α3−4 − 3α1 + α3
(α1 + α3)5
)
,
V1515 = 16 (α4 α5)52
(
(α4 + α5)−4 − 6α1 + α4 + α5
(2α1 + α4 + α5)5
)
,
V1122 =8α1
3 α23 (5α1
2 − 15α1 α2 + 13α22)(α1 + α2)
7 ,
V1222 =8α2 (α1 α2)
32
(α1 + α2)3 (α1 + 3α2)
6 ×
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×(α1
6 + 15α15 α2 + 68α1
4 α22 + 170α1
3 α23 − 51α12 α24 − 729α1 α25 − 690α26
),
V1323 =8 (α1 α2)
32 α3
(α1 + α2 + 2α3)6 ×
(
(α1 − 2α2)(
(α1 + α2)2 + 12 (α1 + α2) α3 + 60α3
2 +160α3
3
α1 + α2
)
+
+ (α1 − α2)
(192α3
4
(α1 + α2)2 +
64α35
(α1 + α2)3
))
,
V1525 =128α4 α5
√α13 α23 α43 α53
(α1 + α2)4 ×
×(
α1 − 2α2(α4 + α5)
4 +10α2 (α1 + α2)
2
(α1 + α2 + α4 + α5)6 −
2 (α1 − 3α2) (α1 + α2)
(α1 + α2 + α4 + α5)5
− α1 − 2α2(α1 + α2 + α4 + α5)
4
)
,
V1133 =56α1
3 α35
3 (α1 + α3)7 ,
V1233 =−256 (α1 α2)
32 α3
5
3 (α1 + α3)2 (α2 + α3)
3 (α1 + α2 + 2α3)6 ×
×(4α2
4 + α13 (α2 − α3) + 35α2
3 α3 + 57α22 α3
2 + 14α2 α33 − 14α34 +
+ 3α12 (α2 − α3) (2α2 + 3α3) + 3α1
(8α2
3 + 18α22 α3 + 5α2 α3
2 − 7α33)),
V1145 =256α1
3 (α4 α5)52 (7α1
2 + α42 + 5α4 α5 + α5
2 + 7α1 (α4 + α5))
3 (α1 + α4)2 (α1 + α5)
2 (2α1 + α4 + α5)5 ,
V1245 =256α4 α5
√α13 α23 α43 α53
3 (α1 + α4)2 (α2 + α5)
3 (α1 + α2 + α4 + α5)6 ×
×(−(α1
3 α2)− 6α12 α22 − 24α1 α23 − 4α24 − 3α12 α2 α4 − 12α1 α22 α4 − 24α23 α4 −
−3α1 α2 α42 − 6α22 α42 − α2 α43 + α1
3 α5 − 42α1 α22 α5 − 11α23 α5 ++3α1
2 α4 α5 − 42α22 α4 α5 + 3α1 α42 α5 + α43 α5 + 6α1
2 α52 − 12α1 α2 α52 −
−9α22 α52 + 12α1 α4 α52 − 12α2 α4 α52 + 6α42 α52 + 6α1 α53−α2 α53 + 6α4 α53 + α5
4),
V1254 =256α4 α5
√α13 α23 α43 α53
3 (α1 + α4)2 (α2 + α5)
3 (α1 + α2 + α4 + α5)6 ×
×(−(α1
3 α2)− 6α12 α22 − 24α1 α23 − 4α24 + α1
3 α4 − 42α1 α22 α4 − 11α23 α4++6α1
2 α42 − 12α1 α2 α42 − 9α22 α42 + 6α1 α43 − α2 α4
3 + α44 − 3α12 α2 α5 −
−12α1 α22 α5 − 24α23 α5 + 3α12 α4 α5 − 42α22 α4 α5 + 12α1 α42 α5 − 12α2 α42 α5 +
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8 .
+ 6α43 α5 − 3α1 α2 α52 − 6α22 α52 + 3α1 α4 α52 + 6α42 α52 − α2 α5
3 + α4 α53),
V2222 =77α2128
,
V2323 =α2 α3 (α2
6 + 7α25 α3 + 21α2
4 α32 + 35α2
3 α33 + 11α2
2 α34 + 7α2 α3
5 + α36)
(α2 + α3)7 ,
V2525 = 16 (α4 α5)52 ×
×(
(α4 + α5)−4 − (8α2 + α4 + α5)
(24α2
2 + 4α2 (α4 + α5) + (α4 + α5)2)
(2α2 + α4 + α5)7
)
,
V2233 =4α2
3 α35 (101α2
2 − 70α2 α3 + 14α32)3 (α2 + α3)
9 ,
V2245 =256α2
3 (α4 α5)52
3 (α2 + α4)3 (α2 + α5)
3 (2α2 + α4 + α5)7 ×
×(202α2
6 + 334α25 α4 + 133α2
4 α42 − 13α23 α43 − 7α22 α44 − α2 α4
5 + 334α25 α5+
+414α24 α4 α5 + 53α2
3 α42 α5 − 58α22 α43 α5 + α4
5 α5 + 133α24 α5
2 + 53α23 α4 α5
2 −−60α22 α42 α52 − 13α2 α43 α52 + 7α44 α52 − 13α23 α53 − 58α22 α4 α53 −+13α2 α4
2 α53 + 12α4
3 α53 − 7α22 α54 + 7α42 α54 − α2 α5
5 + α4 α55),
V3333 =501α3640
,
V3535 =16 (α4 α5)
52
(2α3 + α4 + α5)7 ×
×(824α3
3
5+
128α37
(α4 + α5)4 +
448α36
(α4 + α5)3 +
3296α35
5 (α4 + α5)2+
+2576α3
4
5 (α4 + α5)+ 28α3
2 (α4 + α5) + 2α3 (α4 + α5)2
)
,
V3345 =1536α3
5 (α4 α5)52 (9α3
2 + α42 + 7α4 α5 + α5
2 + 9α3 (α4 + α5))
5 (α3 + α4)2 (α3 + α5)
2 (2α3 + α4 + α5)7 ,
V5445 =6α4
3 α53 (α4
2 + 7α4 α5 + α52)
5 (α4 + α5)7 ,
V5555 =1896α4
5 α55
5 (α4 + α5)9 .
![Page 117: =4; 4 =# > ! , @?A+ ' B DCE;FG Bth-...KW\ PdO.\ PLR f W B % 4A R[^] _Z` w" /D0)< 5< # # $% 0; /G < /4 * /4# * @,D @ " wAVAVA 4A _N " < 0) * /4#W / 6B -AVAVA AVAVAVAVAVAVAVAVAVA](https://reader033.fdocument.pub/reader033/viewer/2022042006/5e7003ef80e47b3ad3216b65/html5/thumbnails/117.jpg)
MZMO.\Z]ZQ,f
K X R|M`[NX_O RbPL[lPdO.R SKNIHe
w*/4"#$ #W*(1" / 6W@.<>6u/4(He
<>/4" 6u/4(w*J< S%5/4(F%.< $A_N$$
45(: ,$3&$w/4:4(wS%7*/4((#/40:'"M1$%#< (@%*$%N@.<>5< (
/S AXM*(J<>/4!/4#W(<>/4(a†*/4((#W/40\/G<./ "*/4(F%.< $5/ 5
q< (w6u1*/4A
E1 = −5.79404,|1 >= −0.82274 a†1s↓ a†1s↑ − 0.404512 a†1s↑ a†2s↓ + 0.309636 a†1s↓ a†2s↑−0.021729 a†2s↓ a†2s↑ + 0.0357708 a†2p0↓ a†2p0↑ − 0.0357641 a†2p1↑ a†2p−1↓+0.0357641 a†2p1↓ a
†2p−1↑|0 >,
E2 = −2.36898,|2 >= −0.727924 a†1s↑ a†2s↓ − 0.727924 a†1s↓ a†2s↑ − 1.53385 10−6 a†2p1↑ a†2p−1↓−1.53385 10−6 a†2p1↓ a†2p−1↑|0 >,E3 = −2.36898,|3 >= 1.02944 a†1s↑ a†2s↑ + 2.16919 10−6 a†2p1↑ a†2p−1↑|0 >,E4 = −2.36898,|4 >= −1.02944 a†1s↓ a†2s↓ + 8.76031 10−18 a†1s↑ a†2p−1↓ + 1.21637 10−18 a†2s↑ a†2p−1↓−2.16919 10−6 a†2p1↓ a†2p−1↓ + 8.76031 10−18 a†1s↓ a†2p−1↑+1.21637 10−18 a†2s↓ a
†2p−1↑|0 >,
E5 = −1.37035,|5 >= 0.567495 a†1s↓ a†1s↑ − 0.381789 a†1s↑ a†2s↓ + 0.53849 a†1s↓ a†2s↑−0.433411 a†2s↓ a†2s↑ − 0.00910772 a†2p0↓ a†2p0↑ + 0.00912602 a†2p1↑ a†2p−1↓−0.00912602 a†2p1↓ a†2p−1↑|0 >,E6 = −1.26427,
![Page 118: =4; 4 =# > ! , @?A+ ' B DCE;FG Bth-...KW\ PdO.\ PLR f W B % 4A R[^] _Z` w" /D0)< 5< # # $% 0; /G < /4 * /4# * @,D @ " wAVAVA 4A _N " < 0) * /4#W / 6B -AVAVA AVAVAVAVAVAVAVAVAVA](https://reader033.fdocument.pub/reader033/viewer/2022042006/5e7003ef80e47b3ad3216b65/html5/thumbnails/118.jpg)
.
|6 >= −0.895812 a†1s↓ a†2p0↓ + 0.262975 a†2s↓ a†2p0↓ − 1.47163 10−17 a†1s↑ a†2p−1↓−2.04336 10−18 a†2s↑ a†2p−1↓ + 1.47163 10−17 a†1s↓ a†2p−1↑+2.04336 10−18 a†2s↓ a
†2p−1↑|0 >,
E7 = −1.26427,|7 >= −0.633435 a†1s↑ a†2p0↓ + 0.185951 a†2s↑ a†2p0↓ − 0.633435 a†1s↓ a†2p0↑+0.185951 a†2s↓ a
†2p0↑|0 >,
E8 = −1.26427,|8 >= −0.895812 a†1s↑ a†2p0↑ + 0.262975 a†2s↑ a†2p0↑|0 >,E9 = −1.26273,|9 >= 1.14407 10−17 a†1s↓ a†2s↓ − 7.06025 10−17 a†1s↓ a†2p−1↓ − 0.633428 a†1s↑ a†2p−1↓−9.80316 10−18 a†2s↓ a†2p−1↓ + 0.185964 a†2s↑ a†2p−1↓ − 0.633428 a†1s↓ a†2p−1↑+0.185964 a†2s↓ a
†2p−1↑|0 >,
E10 = −1.26273,|10 >= 4.97198 10−33 a†1s↓ a†2s↓ − 0.895803 a†1s↓ a†2p−1↓ − 4.99235 10−17 a†1s↑ a†2p−1↓+0.262993 a†2s↓ a
†2p−1↓ − 6.93188 10−18 a†2s↑ a†2p−1↓ − 4.99235 10−17 a†1s↓ a†2p−1↑
−7.06025 10−17 a†1s↑ a†2p−1↑ − 6.93188 10−18 a†2s↓ a†2p−1↑ − 9.80316 10−18 a†2s↑ a†2p−1↑|0 >,E11 = −1.26273,|11 >= 1.21485 10−49 a†1s↓ a†2s↓ − 1.40484 10−16 a†1s↓ a†2p−1↓ − 1.05189 10−33 a†1s↑ a†2p−1↓−1.95061 10−17 a†2s↓ a†2p−1↓ − 1.46054 10−34 a†2s↑ a†2p−1↓ − 1.05189 10−33 a†1s↓ a†2p−1↑+0.895803 a†1s↑ a
†2p−1↑ − 1.46054 10−34 a†2s↓ a†2p−1↑ − 0.262993 a†2s↑ a†2p−1↑|0 >,
E12 = −1.26214,|12 >= −0.633427 a†1s↑ a†2p1↓ + 0.185967 a†2s↑ a†2p1↓ − 0.633427 a†1s↓ a†2p1↑+0.185967 a†2s↓ a
†2p1↑|0 >,
E13 = −1.26214,|13 >= −0.895801 a†1s↑ a†2p1↑ + 0.262996 a†2s↑ a†2p1↑|0 >,E14 = −1.26214,|14 >= −0.895801 a†1s↓ a†2p1↓ + 0.262996 a†2s↓ a†2p1↓|0 >,E15 = −0.516353,|15 >= −0.628776 a†1s↑ a†2p0↓ + 0.194735 a†2s↑ a†2p0↓ + 0.628776 a†1s↓ a†2p0↑−0.194735 a†2s↓ a†2p0↑|0 >,E16 = −0.514665,|16 >= −6.91877 10−18 a†1s↓ a†2p0↓ − 4.98291 10−17 a†2s↓ a†2p0↓ + 0.628746 a†1s↑ a†2p−1↓
![Page 119: =4; 4 =# > ! , @?A+ ' B DCE;FG Bth-...KW\ PdO.\ PLR f W B % 4A R[^] _Z` w" /D0)< 5< # # $% 0; /G < /4 * /4# * @,D @ " wAVAVA 4A _N " < 0) * /4#W / 6B -AVAVA AVAVAVAVAVAVAVAVAVA](https://reader033.fdocument.pub/reader033/viewer/2022042006/5e7003ef80e47b3ad3216b65/html5/thumbnails/119.jpg)
−0.194789 a†2s↑ a†2p−1↓ − 0.628746 a†1s↓ a†2p−1↑ + 0.194789 a†2s↓ a†2p−1↑|0 >,E17 = −0.514078,|17 >= −0.628748 a†1s↑ a†2p1↓ + 0.194787 a†2s↑ a†2p1↓ + 0.628748 a†1s↓ a†2p1↑−0.194787 a†2s↓ a†2p1↑|0 >,E18 = 2.15918,
|18 >= −0.23304 a†1s↓ a†1s↑ + 0.490265 a†1s↑ a†2s↓ − 0.404797 a†1s↓ a†2s↑−0.952009 a†2s↓ a†2s↑ + 0.0499905 a†2p0↓ a†2p0↑ − 0.0499032 a†2p1↑ a†2p−1↓+0.0499032 a†2p1↓ a
†2p−1↑|0 >,
E19 = 2.85271,
|19 >= 0.526972 a†1s↓ a†2p0↓ + 1.0055 a†2s↓ a†2p0↓ − 3.54205 10−17 a†1s↑ a†2p−1↓−4.91813 10−18 a†2s↑ a†2p−1↓ + 3.54205 10−17 a†1s↓ a†2p−1↑+4.91813 10−18 a†2s↓ a
†2p−1↑|0 >,
E20 = 2.85271,
|20 >= 0.526972 a†1s↑ a†2p0↑ + 1.0055 a†2s↑ a†2p0↑|0 >,E21 = 2.85271,
|21 >= 0.372625 a†1s↑ a†2p0↓ + 0.710993 a†2s↑ a†2p0↓ + 0.372625 a†1s↓ a†2p0↑+0.710993 a†2s↓ a
†2p0↑|0 >,
E22 = 2.85425,
|22 >= 5.04768 10−50 a†1s↓ a†2s↓ − 5.83709 10−17 a†1s↓ a†2p−1↓ − 4.37058 10−34 a†1s↑ a†2p−1↓−8.10479 10−18 a†2s↓ a†2p−1↓ − 6.06855 10−35 a†2s↑ a†2p−1↓ − 4.37058 10−34 a†1s↓ a†2p−1↑+0.526991 a†1s↑ a
†2p−1↑ − 6.06855 10−35 a†2s↓ a†2p−1↑ + 1.00549 a†2s↑ a†2p−1↑|0 >,
E23 = 2.85425,
|23 >= −2.06586 10−33 a†1s↓ a†2s↓ + 0.526991 a†1s↓ a†2p−1↓ + 2.07432 10−17 a†1s↑ a†2p−1↓+1.00549 a†2s↓ a
†2p−1↓ + 2.88019 10
−18 a†2s↑ a†2p−1↓ + 2.07432 10
−17 a†1s↓ a†2p−1↑
+2.93353 10−17 a†1s↑ a†2p−1↑ + 2.88019 10
−18 a†2s↓ a†2p−1↑ + 4.07321 10
−18 a†2s↑ a†2p−1↑|0 >,
E24 = 2.85425,
|24 >= −4.75361 10−18 a†1s↓ a†2s↓ + 2.93353 10−17 a†1s↓ a†2p−1↓ + 0.372639 a†1s↑ a†2p−1↓+4.07321 10−18 a†2s↓ a
†2p−1↓ + 0.710989 a
†2s↑ a
†2p−1↓ + 0.372639 a
†1s↓ a
†2p−1↑
+0.710989 a†2s↓ a†2p−1↑|0 >,
E25 = 2.85483,
|25 >= 0.526988 a†1s↓ a†2p1↓ + 1.00549 a†2s↓ a†2p1↓|0 >,E26 = 2.85483,
![Page 120: =4; 4 =# > ! , @?A+ ' B DCE;FG Bth-...KW\ PdO.\ PLR f W B % 4A R[^] _Z` w" /D0)< 5< # # $% 0; /G < /4 * /4# * @,D @ " wAVAVA 4A _N " < 0) * /4#W / 6B -AVAVA AVAVAVAVAVAVAVAVAVA](https://reader033.fdocument.pub/reader033/viewer/2022042006/5e7003ef80e47b3ad3216b65/html5/thumbnails/120.jpg)
.
|26 >= 0.526988 a†1s↑ a†2p1↑ + 1.00549 a†2s↑ a†2p1↑|0 >,E27 = 2.85483,
|27 >= 0.372637 a†1s↑ a†2p1↓ + 0.71099 a†2s↑ a†2p1↓ + 0.372637 a†1s↓ a†2p1↑+0.71099 a†2s↓ a
†2p1↑|0 >,
E28 = 3.02981,
|28 >= 0.380435 a†1s↑ a†2p0↓ + 0.708638 a†2s↑ a†2p0↓ − 0.380435 a†1s↓ a†2p0↑−0.708638 a†2s↓ a†2p0↑|0 >,E29 = 3.03136,
|29 >= −2.9761 10−18 a†1s↓ a†2p0↓ − 2.14339 10−17 a†2s↓ a†2p0↓ + 0.380481 a†1s↑ a†2p−1↓+0.708624 a†2s↑ a
†2p−1↓ − 0.380481 a†1s↓ a†2p−1↑
−0.708624 a†2s↓ a†2p−1↑|0 >,E30 = 3.03195,
|30 >= 0.380483 a†1s↑ a†2p1↓ + 0.708623 a†2s↑ a†2p1↓ − 0.380483 a†1s↓ a†2p1↑−0.708623 a†2s↓ a†2p1↑|0 >,E31 = 3.86792,
|31 >= 1. a†2p0↓ a†2p−1↓|0 >,E32 = 3.86792,
|32 >= 1. a†2p0↑ a†2p−1↑|0 >,E33 = 3.86792,
|33 >= 0.707107 a†2p0↑ a†2p−1↓ + 0.707107 a†2p0↓ a†2p−1↑|0 >,E34 = 3.86851,
|34 >= 1. a†2p0↓ a†2p1↓|0 >,E35 = 3.86851,
|35 >= 1. a†2p0↑ a†2p1↑|0 >,E36 = 3.86851,
|36 >= 0.707107 a†2p0↑ a†2p1↓ + 0.707107 a†2p0↓ a†2p1↑|0 >,E37 = 3.87003,
|37 >= 2.23305 10−6 a†1s↓ a†2s↓ − 1.90028 10−23 a†1s↑ a†2p−1↓ − 2.63853 10−24 a†2s↑ a†2p−1↓+1. a†2p1↓ a
†2p−1↓ − 1.90028 10−23 a†1s↓ a†2p−1↑
−2.63853 10−24 a†2s↓ a†2p−1↑|0 >,E38 = 3.87003,
|38 >= 2.23305 10−6 a†1s↑ a†2s↑ + 1. a†2p1↑ a†2p−1↑|0 >,E39 = 3.87003,
![Page 121: =4; 4 =# > ! , @?A+ ' B DCE;FG Bth-...KW\ PdO.\ PLR f W B % 4A R[^] _Z` w" /D0)< 5< # # $% 0; /G < /4 * /4# * @,D @ " wAVAVA 4A _N " < 0) * /4#W / 6B -AVAVA AVAVAVAVAVAVAVAVAVA](https://reader033.fdocument.pub/reader033/viewer/2022042006/5e7003ef80e47b3ad3216b65/html5/thumbnails/121.jpg)
$
|39 >= 1.579 10−6 a†1s↑ a†2s↓ + 1.579 10−6 a†1s↓ a†2s↑ + 0.707107 a†2p1↑ a†2p−1↓+0.707107 a†2p1↓ a
†2p−1↑|0 >,
E40 = 4.07503,
|40 >= 0.000393282 a†1s↓ a†1s↑ − 0.000138099 a†1s↑ a†2s↓ + 0.000134757 a†1s↓ a†2s↑+0.000439612 a†2s↓ a
†2s↑ + 0.819196 a
†2p0↓ a
†2p0↑ + 0.405535 a
†2p1↑ a
†2p−1↓
−0.405535 a†2p1↓ a†2p−1↑|0 >,E41 = 4.07536,
|41 >= 0.707107 a†2p0↑ a†2p−1↓ − 0.707107 a†2p0↓ a†2p−1↑|0 >,E42 = 4.07595,
|42 >= 0.707107 a†2p0↑ a†2p1↓ − 0.707107 a†2p0↓ a†2p1↑|0 >,E43 = 4.07691,
|43 >= −1. a†2p−1↓ a†2p−1↑|0 >,E44 = 4.07808,
|44 >= −1. a†2p1↓ a†2p1↑|0 >,E45 = 4.4453,
|45 >= 0.080553 a†1s↓ a†1s↑ − 0.0235083 a†1s↑ a†2s↓ + 0.024475 a†1s↓ a†2s↑+0.0772817 a†2s↓ a
†2s↑ + 0.570136 a
†2p0↓ a
†2p0↑ − 0.575924 a†2p1↑ a†2p−1↓
+0.575924 a†2p1↓ a†2p−1↑|0 > . al[A o
![Page 122: =4; 4 =# > ! , @?A+ ' B DCE;FG Bth-...KW\ PdO.\ PLR f W B % 4A R[^] _Z` w" /D0)< 5< # # $% 0; /G < /4 * /4# * @,D @ " wAVAVA 4A _N " < 0) * /4#W / 6B -AVAVA AVAVAVAVAVAVAVAVAVA](https://reader033.fdocument.pub/reader033/viewer/2022042006/5e7003ef80e47b3ad3216b65/html5/thumbnails/122.jpg)
MZMO.\Z]ZQ,f
M`v^O@ILKWQ]Z[NV X_K&KNI:]ZQ\Z[lPdO.R
(w<5*/4&3&+K*/D/4(0<>^@,D@" *< (@,V6u/4(B*J< $*1$=<>/4/ 6 /Z*D8(R+: (.<>$AD1*.&:4(< $*/4+.< ?9HT#(/4M0#W0:\/4?C0@.< *6u(/4" /C0%X(&N#W/4&S#< (<>0\F&,)<0@.< *
RAV#(/40< $*/+/4(0O8
<>@,D@" V3&(@,?16u1$w( " nABqw/\0"/4R/4C*J< 0r$$#T%*J< $X*/+/4(0<>5< 0;!J< $O,9HD0)" /G(0"/4A
_N$$R6u/4$$/S:C0r%/4Z< (M$$%1@(<>0\dP:AXP A 4A ra< 0
rbFW
S0@.< *U6u(/4"p /#W/4&U_ < 0`NA/4& K/4(:4G/ 6W5w< (@=< */D/4(0<>M@,D@")Aw'I'<HTZ< $// A:170r' */+/4(0<><
λ =ra + rbR
µ =ra − rbR
.alP A o
ra< 0
rb*J<>GFW +(#(0G< Bw0@.< */5 6u/D*D/ 6<56l< "$O,/ 6*/4T6u/D*J< $
$$#B< 0V+,D#(FW/4$=< S(R0@.< *FW M6u/+*nA#< (< "(
/ 61*9)$$#*J< )F9HT#(0\F&, */+/4(0<>S76u/4("
a =R
2λ, b =
R
2
√λ2 − 1, e =
R
2a=1
λ,
alP A 4oS(
aBw"8"C<>p/4(<HT
bBw"O8"%/4(B<HTK< 0
eBw**+(*98
%p,4AP(/4" [UAalP A o R<>1 ≤ λ <∞ < 0 −1 ≤ µ ≤ 1 A ZV*J< )S(%0/S-;+1<>/4-6u/4(G*/4T6u/D*J< $$$%#G"&/40-FW6u/4(q!w< (@=<
*/D/4(0<> < z2
λ2− y2
λ2 − 1 =(R
2
)2
. (1 ≤ λ <∞) alP A &o
_N< $/4:4/41$%,4D6u/4(w+,D#(FW/4$=<
z2
µ2− y2
1− µ2=
(R
2
)2
. (−1 ≤ µ ≤ 1) alP A +o
Q#(! .:3 # *)2!# "# '# = * !0G8) 3 = ,D# *.= )*. )*# $C9 =?.H$. B !"# .#&()*3J)*# $. +P
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!
R/2 R/2
O A B
φ
ra
rb
z
P:41(P A 4A#(/4$=<>'#(/40< $^*/+/4(0<>V@,D@")ABY6wwC0%(:4< (0E(/ .<>/4 < (/410 dI<HT0(:&< (00 wd:4;d$$#T%*J< $5*/+/4(0<>@,D@")A
($=<>/4wFWwdw< (@=< )< 0)$$#T%*J< $X*/D/4(0<>S< (
z =Rλµ
2, y =
R
2
√
(λ2 − 1)(1− µ2)alP A 4o
?"C<,q:4G/(0"/4G%6S)@,D@" / 6N*/4T6u/D*J< $$$%#<>0&,D#W(FW/ $=< ;(6u((0 / [U+AValP A T P A +o'(34/4$%34< (/410 \"C<>@/4(C<HT S*.EZI<HT7d*J<>>AI'*/D/4(0<>G0/+V/ V*.< :4GS(J< ;6u/4("(R,*/+/4(0<>;0r'/4:4(MS%(/ .<>/4-< :4$
φS*.
.< Q 3 < $1Vd'(< :40 ≤ φ < 2π
G3 < $1/ 6 Cw< (@=< x< 0
y*/+/4(0<>
z =Rλµ
2, x =
R
2
√
(λ2 − 1)(1− µ2) cosφ x =R
2
√
(λ2 − 1)(1− µ2) sinφ.alP A &o
4< */4F=< TS*.)0rS73&/4$1"Z$"&5d3r =
R3
8
(λ2 − µ2
)dλdµdφ.
alP A $4o9HT#(/ )6u/4(J< #$=< *=< ;
∇2 =4
R2
(1
λ2 − µ2∂
∂λ
(
(λ2 − 1) ∂∂λ
)
+1
λ2 − µ2∂
∂µ
(
(1− µ2)∂
∂µ
)
+
+1
(λ2 − 1)(1− µ2)
∂2
∂φ2
)
.alP A &o
"# ')2!1$C!= )* $2')*3J!"# ,D= *)':$C9 =?.8@= #.8!"# .) & $2A A #3>)EA?$C!# .O"# ')=?3$2A &()-)'13 = *$C!#. P
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# # .
D/4""w(V5< $/C< !< $%(<>0r%/4 &/ 6K#(/4$=<>7#(/40< $*/>8/4(0<>10)S*.)($=<>0;/'/4F&,
λ = cosh ξ, µ = cos η, φ = φ.alP A !&o
Mw< (@=< */D/4(0<>S< (7)9HT#(0!3D=<
x =R
2sinh ξ sin η cosφ,
y =R
2sinh ξ sin η sinφ,
z =R
2cosh ξ cos η.
alP A &o
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MZMO.\Z]ZQ,f
v^O PLv^ILO@OgmX_O.\ PdO@I O.V;O.T O.\ Pτijk
KNSPLv^O v^KNMZM`Q\^i Q\ PdO@iNI:[NV
t′
_N##W0OH; 3 < $1<>Z76u/4$$/S:M&:4(< $
τijk(α, a, h) =α3
π
∫
d3re−α(ri+rj)
rk,
a GA oS(
α)<-#< (< "(< 0
h< 0
a0rE:4/4"(@, / 6RE@,D@"
< '/SP:A GA 4A?/41$09HT#(';3 < $1;/ 6rkS%$#-/ 6
/ (#< (< "( < 0:4/V/34(^./N#(/40< $*/+/4(0<>ADP(/4" F< *(=< :41$=<>(w:4/4"(@,CwQ+/
r2i = r2j + a2 − 2arj cos θrk = rj + (
a2+ h)2 − 2(a
2+ h)rj cos θ
a GA 4o?1#(/4$=<>7#(/40< $ */D/4(0<>wS%;6u/D*/4(:4w/ 6
ri< 0
rj
ri + rj = aλ ri − rj = aµ.a GA &o
D/4$%3D:M@,D@" / 6K[U+Aa GA 4o V:473 < $1rk =
√
a2
4(λ2 − 1) (1− µ2) +
(
λµa
2− h)2
.a GA +o
?;"C<,?(@%G&/[UA5a GA oM< 0-&:4(<>;/34(G;3>< (=< F$φ< 0
µS%/41T5< &,;"C<@/4(w0*1$%/4FT.< :
τijk =
∫ ∞
1
dλ(α3e−aαλ
4(√
(2h+ aλ)2(6hλ− a)−√
(aλ− 2h)2(6hλ+ a)
(a2 − 4h2)(3λ2 − 1) ln 2hλ− a+√
(αλ− 2h)22hλ+ a+
√
(αλ+ 2h)2)).
a GA 4o
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τijk
θ h
a/2 a/2
ri rj
rk
P:41( GA 4A:4/4"(@,d/ 6 '@,D@" 10?/*J< $*1$=<>M'(*&(+:4(< $nA
EV9HT#(/4 (C< ("C< &,+1< (C(/D/ / 6S<;3 < $1'+1< (0 ABYR"C<,FWE:4(J<>$%,t"#$Or0 w< F$:6u1(@()*/4"#1T.<>/4 wF&, #$%:%1#0%X(+
h(: /4A '(:4/47< (al=o
h > a/2^auko
a/2 > h > −a/2 < 0au=o −a/2 > hAT` *J< 1Z/ 6Z@,D""(@,/4N":4&w< $/M< 00C7<>1"#T/
h > 0F1T7%ZN/ 7*< (@,4A\3>< (/41N(:4/4N M#$%Z1#\M&:4(<>/4
/34(λ+/ /q#<>("#$O6k,D%:d.)9HT#(/4;< **/4(0:/E!*./4
(:4/4 AP< $$O, /4FT.< ; /0%X(&5(1$%
A =1
2a3(e−aα((a2 − 4h2)(3 + 3aα + a2α2)(γEuler + ln 2 + ln(aα))
−aα(4a2 − 24h2 + a3α− 12ah2α)) +eaα(a2 − 4h2)(3− 3aα + a2α2)Γ(0, 2aα)),
a GA &oS(
Γ(a, z)R*/4"#$:&< ""C<M6u1*/4
Γ(a, z) =∫∞zta−1e−tdt
< 0γEuler ' 0.5772
wV[U1$( S*/4@.< &J< 0
B =1
2a3(4a(e−aαh(3 + 3aα + a2α2)− e−2hα(3h+ a2α)
)+
+(a2 − 4h2)(eaα(3− 3aα + a2α2)Γ(0, (2h+ a)α)−
−e−aα(3 + 3aα + a2α2)(Γ(0, (2h− a)α) + ln
(2h− a
2h+ a
)
)).a GA $4o
,)< (73>< $0;(#*%34$%,
τijk(α, a, h) =
B h ∈ (i)A h ∈ (ii)
B : h→ −h h ∈ (iii).
a GA &o
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-4 -2 0 2 40,0
0,1
0,2
0,3
0,4
0,5
0,6
0,7
0,8
τ ijk
h
P:41( GA DAXG('*&(V&:4(< $τijk(α, a, h)
AP/4(ZZ#$/ ZwGα =
a = 1A
_ ;(:4/4-F/4(0(G;6u1*/4G*/4&+1/41AK(1$%G6u/4(R;(*&( +:4(< $^< (N9H< *JT< 0C*/41$0CFWN/4FT.< 0CFW*J< 1N5/4(:4^/ 6
rirj< 0
rk ($/D*J<>0*/4$$%J< (AT6u1*/4#$/ 0)P%:A GA DA
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MZMO.\Z]ZQ,f
K6PL[lPLQ;KW\ KNSUR|M`v^O@I:QXA[NV vZ[jI:T KW\ZQXAR
(@6u/4(":<(/ .<>/4Z/ 6DU#(*J< $4< ("/4* /4"" 16u1$nAJYB< $$/S/V9HT#(/4"S#< (< "(UF+,M(K3>< $1^*J< $*1$=<>0G6u/4(^<7"#$(K:4/4"(@,/ 6C@,D@")A?Cw< &R/\: R6u/4("<)*/D/4(0<>@,D@"
r = (r, θ, φ)/d<
(/ .<>0r′ = (r′, θ′, φ′)
AB#(/D*01(R0*(F0?0.< $ nABYM*J< FWR0/4MF&,\<*/4*1T%34G(/ .<>/4!< FW/41TZ< :4$
α< (/410
z<HTd< FW/41T
< :4$β< (/410'
y<HT< 0'r< $$%,G<>FW/41T
γ< (/410'
z<HTA&N< :41$=< (
"/4"+1"/4#W(<>/4(L = (Lx, Ly, Lz)
< *< U(/ .<>/4G/4#W(<>/4(U:4(<>/4(/4#(*J< $< ("/4*AD?*J< )0*(FW1*.!(/ .<>/4<
Ylm(θ′, φ′) = e−ıαLze−ıαLze−ıαLzYlm(θ, φ) =
l∑
µ=−lDlmµ(α, β, γ)Ylµ(θ, φ).
alLVA oR< :41$=< (w"/4"&1" /4#W(<>/4(0// S$J< 01S/41T071F#< *VSO.<MrTHT0
l*7 *J< ;S(%Z7*/40!+1< $%,4A` *J< 17#(*J< $< (p8
"/4*S< (7:4T6u1*/4S/ 6BLz
/4#W(<>/4(w V*J< S(%
Dlmµ(α, β, γ) = e−ımγdlmµ(β)e
−ıµα.alLVA 4o
V*/+ *+dlmµ(β)
*J< )F@,D@"C<>*J< $$%,C*/4"#1T0)1:G76u/4("M1$=<
e−ıβLy
xyz
=
x cos β − z sin βy
x sin β + z cos β
.alLVA &o
, <J34d\6u/4(" #/4$%,D/4"=< $%C/ 6sin β
2
< 0cos β
2
Aw(;<(*1(/4($=<>/4S*.)"#$Orw*J< $*1$=<>/4
1
2(al,m+1d
lm+1,µ(β)− al,md
lm−1,µ(β)) =
d
dβdlmµ(β),
alLVA +o
S(al,m+1 =
√
l(l + 1)−m(m+ 1)AP/4(0.< $ nA
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MZMO.\Z]ZQ,f
M`Q\ mKNILe`Q P X_KWY^M`VQ\^i PdO@I:T
'#D8/4(F%Z*/41#$:6u/4$$/SZ<>1(< $$%,6u(/4" ]N(< *G+1<>/4 A D*G < (!0J< $:ES%t&(< *:?$*(/4w< 0t(\C/]N(< *!+1<>/426u/4("C<>+,&8#< (@*$%*J< Bw0q/\/4FT.< E/4D8($=<>%3D%@*'$"OV/ 6+1<>/4 nAXY7*J< dFWG< *.340F&,\"J< Z/ 6U < 1$K< ##(/JHT"C<>%/4 A?S$$S/ 0(%3&d<Ew<J3&\+1<>/4t6u/4(<Ew/>8*/4"'#W/4&6u1*/4t"$<>('/D*9(+0:4(V+1<>/4E<>R*/4&.< V($=<>%3D%@*G*/4((*/4/)C/4(0((1/c)2
AV#(&5(J<>"&S*$/4$%,C6u/4$$/SJ< 0< 1)< 0 %6u*.%I nA"Z0#0+N]N(< *+1<>/4)*J< )F7S(%)"C<>(OHC6u/4("
(eV +mc2 − E cσ · p
cσ · p eV +mc2 − E
)(ξφ
)
= 0,au.A o
S(eV
$*(/4'#/ +=< $D(: ,4m$*(/4G"C<
p = −ı~ ∂∂r
ξ< 0
φ< (RG*/4"#W/ +7/ 6UMw<34M6u1*/4 < 0
σ< (R < 1$"C<8
(*A^/?:4/)(: ,-*J< $)/ 6N\D*.(D0:4('+1<>/4 )<J3&/1FT(< *5V(@N(: ,/ 6V$*(/
ES = E −mc2A6u/4("M1$=<R6u/4(
*/4"#/4+ξ*J< )FW9HD(< *06u(/4" V< F/34"C<>(OH+1<>/4
(eV − ES + c2(σ · p)(−eV + 2mc2 + ES)
−1(σ · p))ξ = 0.
au.A 4os5/ 0/\C6u/4$$%/S:)9HT#< /4?("R/ 6S+34(
c$J<J3D:!/4$%,
$J< 0:M("TS*9w/4D8($=<>%3D@%*Z$"'%
c2
−eV + 2mc2 + ES
' 1
2m
(
1− ES − eV
2mc2
)
.au.A &o
_N##$%,D:7^9HT#< /4/V[UAXau.A 4oK/45*J< 'S(%S0/S("US*.< (*$100
ES
ESξ =
p2
2m+ eV − p4
8m3c2− ıσ · p× [p, eV ]
4m2c2︸ ︷︷ ︸
H′
−p · [p, eV ]4m2c2
ξ.
au.A +o
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Gr(@7 /;("7< (R'LN< "$%/4=<>!6u/4(ND*.(D0:4(Z+1<>/4 AX(0G(" KS($=<>%3D%@* Q+*(: ,G*/4((*/4 A46u/41(@'KS#D8/4(F%S*/41#$:
H ′ Ar6k;(" S< / (S($=<>%3D@%*Z*/4((*/4 A7("
H ′ *J< )FW7S(%)<
H ′ =e~m2c2
σ ·(∂V
∂r× p
)a.u.≡ α2σ ·
(∂V
∂r× p
)
,au.A 4o
S%2\*/4((#/40:q0r%/4Ct<>/4"*1%dal<TA 1 A o<>6k(\*/40+1< $%p,d:4 A
α ' 1137
7'r@(1*1(C*/4@.< &AC< FW/3&9HT#(/4.< Q4M;Q+/S6u/4("/ 65#D8/4(F%M*/41#$:!6u/4(R#(*J< $$%,?@,D""(*C#W/>8+=< $ /4$%,4AB?;*J< #< (<>#/ +=< $ &/\;#(*J< $$%,?@,D""(*< 0qC("C< :)#< (@
V = V sph + V ′BS(
V ′*J< qFW/4(:4%<>%:6u(/4"
/41$/4"MF&(< */4
V ′(r) =
∫
d3r′ρ(r′)
|r− r′| .au.A &o
(@:%+/M76u/4("M1$=<R6u/4(H ′ V:476u/4$$/S%:Mw/G("
H ′(r) = α21
r
∂V
∂rL · S+ α2
∫
d3r′2ρ(r′)S · ((r− r′)× p)
|r− r′|3.
au.A $4o
Sr(@ <7#W*=< $*J< 5/ 6X5*/40(")+< 0:4%34U5< "w/5#D8/4(F% &(< */4 A+N*/40;N:4(< $6u/4("M1$=<76u/4( < ;< (F%(< (@,'$%/D*J<>/4/ 6^*.< (:4Z#(/D01*:CR#W/ &=< $nW< 0\N"/4(V0*1$%N/*J< $%*1$=<>R01V/7(0#W/ (5+34( |r− r′| 0#0*J A
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Q;e`VQ;KNiNI:[jM`v a
TANABD$=<>( y hjly .m v |\m10NjmGin j v yjly v m> )* 7(<Jw8pL5$$ns59 /4(Q !TA
VG A :A A /4< 0EsVA LVA!< (*9 .m v jlin m>i jY j |zin.z W34/4$nA4]N/3&( U1F$nA%s5 /4(Q !-$ MWALTX( m>jm.j v m>h .j v mz.m.W| D#(:4( U($=< :` ($ 4TA MA .AX_N"/3WTA <4< MA GAX_N0( U+,D S3WA` && ! &a!"! o
A?nAMAZn il~i & " )a!"! +o9A
MWA GA [UI/3W MA .A _N"/3W]RA 7/4"Q+n GA _RAwT<Jw<>IQ&,4 U&,DAS3WA9JA ; a!"!"!&o
GAL5$0 GA 7$$( MA[K,4(@K]RA ^/4$$< (0TJ MAB.A
_N%%"/3W il~i; = a o9A V_RA ,D*(I %U A]RA 4< :4$$%/4< #5%34(%,47(< Q$ 4TA $ A < /4(FW"Q+n U A]RA 4< :4$$%/4< #5%34(%,47(< Q$ A MA _VAwP/+*9QXA 6pA U&,DA 2a!44o
MA _RA P/D*.Q +~9m>jl|m * 2> hjm 2 m>i
j.m v ikiWm>% 5:4(< 0 #5%34(%p,45:4(< 0 !"$DA !V_RA:UABP( TAB]RA q< $*.Q><T ' hjm ' W.m v il! *#" %$ ''& iny!( )#)zj!*
<$"@ / E,D0<JS*p /CsN< 1Q4/ q< (IJ<Jw<T !"DA RWAD*.+ FW( Nh?ikhj v m- yjlinm>hEjm v % jli 2izjlin y hjly ;j .m v | S/
B(/4\< 0! /A%[K3 < @/4 ! 4A V`NAS/4FW(@/4 _N")ATA U+,DA & -$)a!-$ &o9A TA+D#< $Q&[A+EA 4($%*. >_RA,D*(I A < /4(FWQ+ .m~ikhXZz..m>h
h v zjy hjli ) jlinm>hd9& v mJ+ jm'j hW hXmz.m.WinSz|zjRzMm10Nikhj v +jlikhDx0 v Ginm>hTz* 32izikj 1F"%0;/ U+,DA S3WA`NA
RD#<kQ TA'< $nA%_S*.< U+,DA B/4$/4*J<!` -$!a &oil~i "!
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..
V_RADIJ< FW/N< 0RsVA WA& Z@$10 y hjly ( Gizj v | al]N/34( )/4$=<T!"!&o9A A_RA D<J3D% j m-zm10 .j v m>hin j v yjly v .m v | 0%0\F+,!LVA
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>@*QTADD#<kQ [U$*(/4*@.<>/>6 < /4*/4#**9< ^< 0(:4K6u(/4"r(@M#(*#$ B[^]_Z` "/D0 > v m*5m10'j > 2> hX. z v & m v *z m. (m>hX.Wjkzikh .j v m>h (m v9v % jlinm>hTz >0 A4_RA WA4_N$.H< 0(/3N< $nA% 7$1+ (_S*J<>0"* U1F$(]N/4(0(*.+ ## A8p-$DA
$ TAXD#<8QW[A EA 4($%*. _RA ,D*(I>A < /4(FW"Q+nW< 0 A B/D0=< 0%=,4U(/4#W(@'/ 6Z*/4(($=<>0< /4*/4#*@,D@"6u(/4" */4"GF0-9H< *0=< :4/4< $%IJ<>%/4V8 &~5ikhikjlinm "/D0 >4 (m>hX9WjkzSikh .j v m>h (m v9v % jlinm>h 0 A&_RA NA&L5S/4 MA%X$=<>* 7$1&w(U_*J< 0"* U1F$(&]N/4(0(*9& 4T## A "$8 "TA
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! TAD#<kQT_RA ,D*(I [A EA 4($%*. T<>0 A < /4(F"Q+n [U$*(/4;*/4(p8($=<>/4M<>K< /4*J< $ > Zi%x i%x jkzikh (m>h+hTz jlj v |zin.z 0 A _RA_3&$$=<< $nA%&_N"(*J< @%1T5/ 6 U&,D*s5 /4(Q4T&## A ! 8p4TA
V_RA,D*(I TAD#< $Q U+,DA S3WA^` = -$ Ea o_RA,D*(I TA
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