Physics – Atomic Physics
Scientific paper
Feb 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000ycat..21230295g&link_type=abstract
VizieR On-line Data Catalog: J/ApJS/123/295. Originally published in: 1999ApJS..123..295G
Physics
Atomic Physics
Atomic Physics
Scientific paper
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 3s23p4 3P, 1D, 1S; 3s3p5 3P0, 1P0; 3s23p3(4S0)3d 3D0, 3s23p3(2P0)3d 1,3P0, 1,3D0, 1,3F0, 3s23p3(2D0)3d 1,3S0, 1,3P0, 1,3D0, 1,3F0 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 3s23p4 3P2,1,0 levels to the fine-structure levels of the 3s23p33d configuration are compared with the distorted-wave results of Bhatia & Doschek (1996) 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 5x105 to 5x106 K. (3 data files).
Gupta G. P.
Tayal Swaraj S.
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