Abstract
Perturbation theory together with a model zeroth-order approximation is used to calculate the energy levels of the 4s4p, 4p2, 4s4d, 4p4d, and 4s5s configurations of a number of Zn-like ions with nuclear charges in the range Z = 36–50. The zeroth-order functions of the approximation are the wavefunctions of an electron that moves in the field of the model core potential. The parameters of the model potential are found by using the empirical energy levels of the Cu like ions. The calculation is carried out to first order in the perturbation theory together with the inclusion of an effective account of the higher order corrections. The calculation is accurate to a fraction of a percent.
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