Autoionising states of three-electron atomic systems

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Abstract
The excitation energies and the probabilities for the radiative and radiationless decay of the autoionising states belonging to the 2s22p, 2s2p2 and 2p3 configurations have been calculated for three-electron atomic systems on the basis of perturbation theory with respect to inter-electron interaction in a broad range of values of atomic number Z. Using the results of the diagonalisation calculations of the autoionising states of two-electron systems, the authors have obtained estimates of corrections to the autoionisation widths calculated by perturbation theory. The calculations of the radiative transition probabilities for Fe and Ni ions are in good agreement with the 1976 results of Nussbaumer.