Atomic data for opacity calculations. XIII. Line profiles for transitions in hydrogenic ions

Abstract

For pt.XII see ibid., vol.22, p.3603 (1989). Methods are described for the calculation of profiles of lines due to transitions in hydrogenic ions. Requirements are that the calculations should be fast and should give results of accuracy adequate for the opacity work, for which the line wings are of particular importance. Quantum mechanical methods are used for the electron perturbers and a quasi-static theory is used for the ion perturbers. Results of the calculations are compared with measured profiles for H I and He II lines. The agreement is generally satisfactory. There are some discrepancies in the line cores, due to neglect of ion dynamics, but these are not of importance for the opacity work.