Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001mnras.322..779b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 322, Issue 4, pp. 779-784.
Astronomy and Astrophysics
Astronomy
4
Atomic Processes, Line: Formation, Plasmas
Scientific paper
Effective collision strengths for electron-impact excitation of the N-like ion Siviii are calculated in the close-coupling approximation using the ab initio R-matrix method. The 22 fine-structure levels arising from the 11 lowest LS target states: 2s22p3, 2s2p4, 2p5 and 2s22p23s are retained in the present calculation. The effective collision strengths for all forbidden transitions within the 1s22s22p3 4 S 3/2 o, 2 D 3/2,5/2 o, 2 P 1/2,3/2 o ground configuration levels are obtained by averaging the electron collision strengths, for a wide range of incident electron energies, over a Maxwellian distribution of velocities. Results are presented for electron temperatures in the range logT(K)=3.3 to logT(K)=6.5, applicable to many laboratory plasmas and in particular to astrophysical plasmas. We believe that the results are the most accurate to date and, indeed, the only data available which take account of resonance effects.
Bell Kenneth L.
Matthews Aaron
Ramsbottom C. A.
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