Other
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...246.1031p&link_type=abstract
Astrophysical Journal, Part 1, vol. 246, June 15, 1981, p. 1031-1039. Research supported by the U.S. Department of Energy.
Other
110
Atomic Energy Levels, Atomic Excitations, Electron Impact, Helium Ions, Transition Probabilities, Autoionization, Collision Rates, Electron Scattering, Inelastic Scattering, Scattering Cross Sections, Variational Principles
Scientific paper
The distorted wave (DW) approximation is used to solve the e(+) ion scattering problem. It is found that for He-like ions the DW approximation, which neglects coupling between states other than the initial and the final, compares extremely well with the more elaborate close-coupling approximation. Rate parameters gamma(T) are presented for all 10 transitions involving the ground state and the n=2 states, for He-like Be, C, O, Ne, Si, Ca, and Fe. The rate parameters were obtained from collision strengths calculated and fitted to expressions in energy, separately in a number of different energy intervals. In terms of the variation with temperature T, the results gamma(T), may be divided into three categories corresponding to forbidden, intercombination, and allowed transitions.
Hummer David G.
Norcross D. W.
Pradhan Anil Kumar
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