• Radio Recombination Lines of Hydrogen

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    • Keywords


      H II regions: ISM; profiles: radio lines; spectral line broadening: calculations.

    • Abstract


      The impact theory of spectral line broadening is used to obtain complete profiles for radio recombination lines perturbed by electron and proton impact. The collisions can be divided into two types: inelastic, where transitions take place between hydrogen levels with different principal quantum number 𝑛 and elastic, where the transitions are only between degenerate levels for a particular value of 𝑛. The widths of the radio lines are essentially determined by inelastic electron collisions and elastic proton collisions with the emitting hydrogen atom occupying either the upper or lower levels of the line.

      Here, earlier work is extended to examine the contribution from proton collisions to the line width in more detail, and it is shown that the trends in the behaviour of the widths again confirm previous results.

    • Author Affiliations


      G. Peach1

      1. Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK.
    • Dates

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