Astronomy and Astrophysics – Astronomy
Scientific paper
May 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.179..275b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 179, May 1977, p. 275-292. Research supported by the Science Research C
Astronomy and Astrophysics
Astronomy
57
Cations, Electron Impact, Ion Production Rates, Ionization Cross Sections, Plasma Spectra, Autoionization, Electron Beams, Plasma Diagnostics, Radiative Recombination, Solar Spectra, Ultraviolet Spectroscopy
Scientific paper
Simple methods of evaluating ionization rate coefficients which have been used in various ionization-balance calculations are compared with values measured in the laboratory. Laboratory measurements are by the crossed-beams method and by plasma spectroscopy; it is shown that on average both kinds of experiments favor the exchange classical impact parameter (ECIP) method of calculating ionization rate coefficients, although it is not clear why this should be so. This evidence supports Summers' (1974) ionization-balance calculations, which are based on ECIP ionization cross sections. It is also shown that on average the Coulomb-Born calculations, for the small sample considered, are in no better agreement with laboratory measurements near threshold than those by the simpler methods.
Burgess Andrew
Cochrane D. M.
McWhirter W. P. R.
Summers Hugh P.
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