Abstract
Many-body perturbation theory has been used to calculate the resonance structure (3 p→3 d) into the photoionization (4 s→ kp) for ion Ca +. This resonance structure results from the interference between a photoionization process or a photoionization with excitation process and a resonant Auger process. The coupled equation method has been improved to calculate this interference by the summation of specific classes of diagrams of perturbation theory to infinite order. The resonance structure in the region of the 3p threshold is enhanced via a super-Coster–Kronig transition. The theoretical results are in good agreement with experiment.
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