Author： Tryhuk V.
Publisher： Springer Publishing Company
ISSN： 0021-9037
Source： Journal of Applied Spectroscopy, Vol.77, Iss.6, 2011-01, pp. : 749-757
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Abstract
Analytical perturbation theory is adapted to calculate properties of multi-electron atoms and ions. Results from zero- and first-order approximations are presented analytically and have an accuracy comparable to that of the Hartree-Fock method. It is shown for the first time that the summation over two-electron intermediate states in calculations of correlation corrections can be done in closed form.
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