Comments on the Broadening of Spectral Lines by Collisions with Atomic Hydrogen

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Abstract
Recent developments in the theory of spectral line broadening by collisions with hydrogen atoms are briefly reviewed. Particular attention is devoted to a promising theory by Brueckner. This theory is developed further and tables of line broadening cross-sections are presented which, in cases where a direct comparison can be made, are somewhat smaller than those obtained by Brueckner. The results are compared with damping constants determined empirically from the solar spectrum and agreement is found to within the large uncertainty in these empirical damping constants.

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