Document Type

Article

Publication Date

1969

Publication Title

Physical Review

Volume

181

Issue

1

First Page

23

Last Page

24

Abstract

Accurate variational calculations are presented for the off-diagonal matrix elements of the Breit interaction between the 2P1 and 2P3 states of several members of the helium iso-electronic sequence. A comparison is made with recent Z-expansion calculations, which are accurate through terms of order α2Z3. The comparison shows that the Z-expansion method for off-diagonal mixing is potentially useful in the theory of many-electron atoms. The effect of singlet-triplet mixing on the 2P3 excitation cross sections is briefly discussed. © 1969 The American Physical Society.

Comments

This article was first published in PHYSICAL REVIEW . Copyright (2012) American Physical Society (APS). (http://dx.doi.org/10.1103/PhysRev.181.23)

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