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Accurate QED evaluations of the one- and two-photon interelectron interaction for the configurations 1s1/22s1/2¹S₀ and 1s1/22s1/2³S₁ in He-like ions and for the configurations (1s)²2s1/2 and (1s)²2p1/2 in Li-like ions with nuclear charge numbers $30<~Z<~92$ are performed. The three-photon interaction is also partly taken into account. The QED theory of these corrections is provided by the adiabatic S matrix and by the line-profile approach. The Coulomb gauge is employed. The results are compared with available experimental data and with different calculations.
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Andreev et al. (2001) studied this question.
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