volume 60, issue 4, P1597-1602 1974
DOI: 10.1063/1.1681236
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Abstract: The approximate spin projection method of Amos et al. is extended to handle UHF wavefunctions having three significant components of differing multiplicity. An expression is given for the energy after single annihilation which differs from that of Amos and Hall. The' new expression reproduces the results obtained from a previous exact calculation for which the weights and energies of the components are known, The extended approximate projection method is applied to the pi-electron UHF wavefunctions for the gr…

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