Feshbach-model potential approach for the study of resonant and bound states of Be-like ions

Abstract
We present an implementaion of the Feshbach formalism to calculate energy positions and widths of doubly excited states of Be-like ions. These systems can be treated formally as two-electron problems by using a suitable model potential to describe the effect of the 1s2 core. In this respect, we discuss the pertinence of using the one-parameter model potential Vm=2r1-2r1(1+αr)e2αr. Energies and widths for 1s24l4l1 Se and 1 Po autoionizing states of N3+ and Ne6+ are reported.

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