Abstract
The correlation factor of Colle and Salvetti is studied by comparing the behavior of three different correlation functionals. The normalization, sum rule, Coulomb hole, correlation energy integrand, and the Wigner exclusion hole have all been analyzed by applying the three approaches. The results indicate that the correlation factor proposed by Colle–Salvetti is a very good choice for modeling electron correlation in atoms. The flaws appearing in the development of the Colle–Salvetti equations seem mainly due to an inadequate use of the first mean value theorem of integral calculus. The Gaussian summation used for the two-body density matrix seems to be a good approximation to obtain the correlation factor equations.
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Moscardó, F., San-Fabián, E. & Pastor-Abia, L. The Colle–Salvetti Wavefunction Revisited: a Comparison Between Three Approaches for Obtaining the Correlation Energy. Theor Chem Acc 115, 334–342 (2006). https://doi.org/10.1007/s00214-005-0060-6
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DOI: https://doi.org/10.1007/s00214-005-0060-6