The recombination and level populations of ions. I - Hydrogen and hydrogenic ions

Details The recombination and level populations of ions. I - Hydrogen and hydrogenic ions The recombination and level populations of ions. I - Hydrogen and hydrogenic ions

Feb 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976mnras.174..345b&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 174, Feb. 1976, p. 345-391. Research supported by the Science Research

Astronomy and Astrophysics

Astronomy

104

Atomic Energy Levels, Hydrogen Ions, Hydrogen Recombinations, Ion Recombination, Population Theory, Electron Scattering, H I Regions, H Ii Regions, Ionization Coefficients, Magnetohydrodynamic Stability, Radiative Recombination, Thermodynamic Equilibrium

Scientific paper

A description is given of the atomic processes occurring in an unbounded plasma containing ions, electrons and protons and permeated by external radiation fields. The ionization equilibrium is formulated in a matrix scheme which simplifies the definition of the effective recombination and ionization rate coefficients, namely, the collisional radiative coefficients, and also permits the unification of statistical and mechanistic approaches to recombination. A method of numerical solution of the statistical balance equations for the collisional radiative coefficients and the level populations is given. Results are presented for hydrogen and hydrogenic ions in both graphical and numerical form. The influence of radiation and free particle temperature and density on the excited level populations of hydrogen is demonstrated. Tabulations of level populations are given appropriate to H I regions and to fairly dense H II regions. Simple expressions for bound-bound and bound-free Gaunt factors and for impact parameter cross-sections are given as Appendices.

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