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- W2103604906 abstract "The first two members of the cyclic polyene homologous series are studied over a wide range of the coupling constant using the Hubbard and Pariser–Parr–Pople model Hamiltonians. The full and various limited configuration interaction (CI) correlation energies and wave functions are calculated exploiting the unitary group approach. The formalism for the cluster analysis of the exact wave function expressed through the unitary group formalism electronic Gelfand states is developed and applied to the full CI wave functions of the cyclic polyene models studied. It is shown that the connected tetraexcited clusters become essential in the fully correlated limit and that their contribution also significantly increases with electron number even for the coupling constant corresponding to the spectroscopic parametrization of the model Hamiltonians used." @default.
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- W2103604906 date "1982-12-01" @default.
- W2103604906 modified "2023-10-14" @default.
- W2103604906 title "Cluster analysis of the full configuration interaction wave functions of cyclic polyene models" @default.
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- W2103604906 doi "https://doi.org/10.1002/qua.560220611" @default.
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