Abstract
Energy levels of 1s2lnl' (n = 2-18, l = 0-5) configurations for different ions were calculated by using the perturbation theory method (MZ code). The Z-expansion method allows us to describe the correlation part of the energy in the first, second and other orders of the perturbation theory. Using this method, we calculated the contribution of the virtual configurations with positive energies to the correlation part of energy for two- and three-electron systems. Relativistic effects are taken into account by the Breit-Pauli operators.
The asymptotic behavior of n for the energy matrix of the 1s2lnl' states are discussed. Comparisons with other theoretical results and experimental data are given for the 1s2l2l', 1s2l3l' and 1s2l4l' configurations. Absolute, Auger and transition energies have been calculated for different Z.
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