Thermally averaged collision strengths for Sr+

Details Thermally averaged collision strengths for Sr+ Thermally averaged collision strengths for Sr+

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989phrva..40..451b&link_type=abstract

Physical Review A (General Physics), Volume 40, Issue 1, July 1, 1989, pp.451-454

Physics

General Physics

2

Electron-Ion Scattering, Excitation And Ionization, Chemically Peculiar Stars

Scientific paper

We use the Gauss-Laguerre method to perform Maxwell averaging of distorted-wave collision strengths for transitions among the lowest three terms of singly ionized strontium. Rate coefficients are readily derived from the thermally averaged collision strengths Υ. By suitably scaling Υ, we form reduced collision strengths Υred that are finite at all temperatures. Each Υred is plotted as a function of reduced temperature Tred, which maps the entire range of T onto the interval [0,1]. We use the least-squares method to fit Υred by a five-point cubic spline. This fitting procedure has an rms error of less than 1% and is performed on a microcomputer by an interactive program with graphic display.

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