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Correlation effects in atoms. III. Four-electron systems

par Byron Jr., FW;Joachain, Charles
Référence Physical Review, 157, 1, page (7-23)
Publication Publié, 1967

Article révisé par les pairs

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Résumé :

The binding energy of the ground state of four-electron systems is investigated in the framework of Hartree-Fock perturbation theory. First, we show that the original problem can be decoupled into a series of helium-like equations describing pair correlation between electrons. Then, the variational-perturbation method is applied to each of these equations through fifth order in energy. We have obtained for the correlation energies the values Ecorr(Be)=-0.0925 atomic units (a.u.) and Ecorr(B+)=-0.1096 a.u. The experimental numbers are Ecorrexp(Be)=-0.0944 a.u. and Ecorrexp(B+)=-0.1116 a.u. © 1967 The American Physical Society.