Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.178..101s&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 178, Jan. 1977, p. 101-122. Research supported by the U.K. Atomic Energ
Astronomy and Astrophysics
Astronomy
26
Angular Momentum, Atomic Energy Levels, Electron States, Ionization Coefficients, Radiative Recombination, Thermal Plasmas, Atomic Collisions, Atomic Structure, Electron Scattering, Electron Transitions, Helium Ions, Hydrogen Ions, Ion Production Rates, Lyman Alpha Radiation, Quantum Numbers
Scientific paper
Methods of analysis of the recombination and population structure of ions in a thermal plasma are extended to permit unification of the unresolved angular momentum quantum number treatment of highly excited states with a resolved angular momentum treatment of lower states. Hydrogen and helium are considered and best available rates for processes involving the lowest levels are incorporated. Generalized collisional radiative recombination and ionization coefficients are presented and the effect of a strong Lyman alpha radiation field on hydrogen is investigated. The whole population structure of hydrogen and helium for a representative selection of planetary nebular conditions is presented.
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