Other
Scientific paper
Sep 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974apjs...28..323s&link_type=abstract
Astrophysical Journal Supplement Series (Supplement no. 263), vol. 28, Sept. 1974, p. 323-334.
Other
42
Atomic Collisions, Atomic Excitations, Electron Impact, Helium, Light Elements, Transition Probabilities, Collision Rates, Electron Transitions, Ionic Reactions, Relativistic Effects, Solar Spectra, Velocity Distribution
Scientific paper
Numerical results are obtained for collision strengths for transitions involving principal quantum numbers less than 4 induced by electron impact on highly ionized atoms with four or less bound electrons. The results are fitted to analytic expressions which are readily integrated over a Maxwellian velocity distribution to give collision rates. Comparison is made with results available by other methods. Unless Z is very large so that relativistic corrections are of great importance, the approach used improves with increase in Z. It appears for the most part to be accurate to within 40 percent for Z/N not less than 3, where N is the number of bound electrons per ion.
Parks Allen D.
Sampson Douglas H.
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