Abstract
The effects of the second-order configuration interaction perturbations on the energy-level structure of nl N, \(nl^N n_1 l_1^{N_1 }\) and \(nl^N n_1 l_1^{N_1 } n_2 l_2\) configurations have been studied. In the previous works (see Part I and II) we presented a method, which allows to analyse complex electronic systems composed of configurations including up to four open shells and the formulae for the first-order electrostatic interaction between sophisticated configurations. In the present paper we consider two-electron core excitations for and between the configurations under study. They constitute the basis for the design of an efficient computer program package allowing large-scale calculations providing accurate wave functions.
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Elantkowska, M., Ruczkowski, J. & Dembczyński, J. Construction of the energy matrix for complex atoms Part III: Excitation of two equivalent electrons from a closed shell into an open shell or an empty shell. Eur. Phys. J. Plus 130, 83 (2015). https://doi.org/10.1140/epjp/i2015-15083-7
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DOI: https://doi.org/10.1140/epjp/i2015-15083-7