1/Z expansion calculation of the Bethe logarithm for the ground state Lamb shift of two-electron ions

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, , Citation S P Goldman and G W F Drake 1983 J. Phys. B: Atom. Mol. Phys. 16 L183 DOI 10.1088/0022-3700/16/7/001

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1 Dept. of Phys., Univ. of Western Ontario, London, Ont., Canada

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0022-3700/16/7/L183

Abstract

The leading two terms in the 1/Z expansion of the two-electron Bethe logarithm are calculated by the application of a new finite basis set method. The results can be expressed in the form ln epsilon (1s2 1S)=ln(19.77(Z-0.0063)2). The high-Z behaviour appears to differ from that of a previous variational calculation by Aashamar and Austvik (1976).

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