Ion-radiator dynamic effects in Stark broadening of He II lines

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Abstract
A recently proposed relaxation theory of Stark broadening by ion perturbers is shown to be valid for the case of charged radiators. In addition, the straight-line-path assumption for the radiator and for the ion perturbers is examined and shown to be a good approximation for the first few members of the hydrogen isoelectronic sequence. Results of sample calculations of the Stark profiles of the Lyman- alpha and Balmer- alpha lines of He II are presented which show significant dynamic effects at electron densities as high as 1018cm-3. Extrapolation of the results to the Paschen- alpha (4686 AA) line suggests that the discrepancy between experiment and the unified-theory calculations is primarily due to the static ion-radiator approximation of the earlier theory.