Abstract
Energy levels of Mg-like ions are calculated by the relativistic perturbation theory (PT) using a model-potential (MP) zero-order approximation. The system consists of the 1 s 22 s 22 p 6 core and two valence electrons. The energy levels are obtained by diagonalization of the energy matrix calculated between all the 3 l 13 l 2 states of the same parity and of the same total angular momentum J. The lowest order of the PT is treated exactly, whereas higher orders are included through an effective interaction. The contribution of the core polarization is accounted for by introducing an additional interaction V pol(r 1r 2) between talence electrons. The introduction of V pol(r 1r 2) in effect reduces the multielectron problem to a two-electron one with accuracy up to the second order of the PT. The calculation has been made for ions with nuclear charges Z = 25–84.
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