The influence of collisional-ionization and recombination processes on spectral line shapes in stellar atmospheres and in the hydrogen clouds in broad-line region of AGNs

Abstract

In this paper, the importance of H*(n) + H(1s) collisional ioniza-tion as well as the in°uence of inverse recombination processes in different environments has been investigated within the regions 2 ≤ n ≤ 20 and 4 000 K ≤ T ≤ 20 000 K. The interpretation of this in°uence is based on existing method of describing inelastic processes in symmetrical atomRydberg-atom collisions. These processes have effect on ionization and the populations of hy-drogen excited atoms in moderately ionized plasma layers. From the results it follows that the investigation of these processes is of interest for the research and modelling of such medium.