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Title:
Electron Impact Excitation of Fine-Structure Levels in Sulfur-like Fe XI
Authors:
Gupta, G. P.; Tayal, S. S.
Publication:
The Astrophysical Journal Supplement Series, Volume 123, Issue 1, pp. 295-309. (ApJS Homepage)
Publication Date:
07/1999
Origin:
APJ
ApJ Keywords:
ATOMIC DATA, ATOMIC PROCESSES
DOI:
10.1086/313235
Bibliographic Code:
1999ApJS..123..295G

Abstract

Collision strengths for electron impact excitation of fine-structure levels in sulfur-like Fe XI are calculated in a semirelativistic R-matrix approach. The 38 fine-structure levels arising from the 20 LS states 3s^23p^4 ^3P, ^1D, ^1S; 3s3p^5 ^3P^o, ^1P^o; 3s^23p^3(^4S^o)3d ^3D^o, 3s^23p^3(^2P^o)3d ^1,3P^o, ^1,3D^o, ^1,3F^o, 3s^23p^3(^2D^o)3d ^1,3S^o, ^1,3P^o, ^1,3D^o, ^1,3F^o are included in our calculation. The target levels are represented by configuration interaction wave functions. The relativistic effects are considered in the Breit-Pauli approximation by including one-body mass correction, Darwin term, and spin-orbit terms in the scattering equations. Collision strengths for transitions from the 3s^23p^4 ^3P_2,1,0 levels to the fine-structure levels of the 3s^23p^33d configuration are compared with the distorted-wave results of Bhatia & Doschek at 8.0, 16.0, 24.0 ryd. There are some significant discrepancies between the two calculations, mostly caused by the difference in target wave functions. The collision strengths are integrated over a Maxwellian distribution of electron energies to obtain effective collision strengths over the temperature range from 5x10^5 to 5x10^6 K.

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