A perturbation calculation on helium

1 March 1972

journal article
Published by IOP Publishing in Journal of Physics B: Atomic and Molecular Physics

Vol. 5 (3), 432-437
https://doi.org/10.1088/0022-3700/5/3/008

Abstract

A calculation of the energy and various expectation values of the 1¹S, 2^1.3S and 2^1.3P states of helium using perturbation theory is described. The method is based on zero order wavefunctions generated by the frozen core Hartree-Fock approximation. To fourth order in the energy and second order in the wavefunctions excellent agreement with the calculations of Pekeris is obtained.

Keywords

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