Abstract

Theoretical multiplet-strengths for electric quadrupole transitions between 2 S, 2 P 0, 2 D and 2 F 0 levels of the ions Fe XVI, Co XVII and Ni XVIII have been calculated using Hartree-Fock orbital wave-functions of frozen-core type. Relativistic corrections to the energy levels have been calculated by means of First-order perturbation theory, and yield results in excellent agreement with the recent measurements of Feldman et al.

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