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Open shell extensions of the conventional monoexcited configuration interaction method and the time-dependent Hartree-Fock model are developed by using the grand canonical and the canonical ensemble averaging procedures. The electronic excitations are considered to be from a ground state which has fractional occupational numbers. The models are applied to conjugated hydrocarbon radical ions within the Pariser-Parr-Pople model.
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Poul Jo rgensen (1972) studied this question.
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