Correlation and relativistic effects for many-electron systems
- 1 September 1987
- journal article
- Published by IOP Publishing in Physica Scripta
- Vol. 36 (3) , 464-467
- https://doi.org/10.1088/0031-8949/36/3/014
Abstract
The N-electron Dirac-Coulomb equation is partitioned into an equivalent of the Schrödinger equation and perturbations. The perturbations involved are ordered according to increasing order of smallness in c−2. The electron-electron interaction itself is also treated as a perturbation. This leads to a new version of the double perturbation theory which provides the basic ideas for simultaneous study of the correlation and relativistic effects. Second-order results for some members of the He isoelectronic sequence are obtained by starting with the Hartree-Fock approximation and using the variational-perturbation method. The total energies calculated through second-order are in excellent agreement with their MCDF counterparts.Keywords
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