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The relativistic two-body interaction in many-electron atoms is investigated in detail. The authors show that the transferred energy contribution which appears in the expression of the two-body interaction is significant at the present level of experimental accuracy. They also show that the Coulomb and Feynman gauge expressions for the relativistic two-body interactions are equivalent in the on-shell energy case for a local potential, but the same terms appear in different orders of approximation in the two gauges. In addition, a critical comparison between the MCDF-EAL and MCDF-OL methods is made from this point of view.
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Hata et al. (1984) studied this question.
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