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Figure 1: Helium-like atom or ion. |
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Figure 2: Spin states of two electron system. |
χA = 1/Ö2 [χ+(1) c-(2) − χ+(2) c-(1)] | MS = 0 | ||
χS = | ì
í î |
χ+(1) χ+(2) | MS = +1 |
1/Ö2 [χ+(1) c-(2) + χ+(2) c-(1)] | MS = 0 | ||
c-(1) c-(2) | MS = −1 |
The total wavefunction of electron system should be antisymmetric one. |