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Configuration interaction (CI) calculations in atoms with two-valence electrons, carried out in the V^(N-2) Hartree-Fock potential of the core, are corrected for core-valence interactions using many-body perturbation theory (MBPT). Two variants of the mixed CI+MBPT theory are described and applied to obtain energy levels and transition amplitudes for Be, Mg, Ca, and Sr.
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Savukov et al. (2002) studied this question.
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