Abstract
A formula is derived for the approximate calculation of the correlation energy, starting from knowledge of the one-electron and two-electron density matrices, calculated by the Hartree-Fock method.
The results that we have obtained in test calculations seem to be accurate enough (average error 2.5%, highest error 8%)
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Colle, R., Salvetti, O. Approximate calculation of the correlation energy for the closed shells. Theoret. Chim. Acta 37, 329–334 (1975). https://doi.org/10.1007/BF01028401
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DOI: https://doi.org/10.1007/BF01028401