Physics – Atomic Physics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008ycat..34860629t&link_type=abstract
VizieR On-line Data Catalog: J/A+A/486/629. Originally published in: 2008A&A...486..629T
Physics
Atomic Physics
Atomic Physics
Scientific paper
Oscillator strengths and electron impact excitation collision strengths for CII lines among the fine-structure levels are calculated. Thermally averaged collision strengths are presented as a function of electron temperature for application to astrophysical plasmas.
An accurate description of the target wave functions has been obtained in the multiconfiguration Hartree-Fock approach with flexible non-orthogonal orbitals. The 42 fine-structure levels of the 2s2^2p, 2s2p2, 2s23l (l=0-2), 2p3, 2s24l (l=0-3), 2s2p3s and 2s2^5l (l=0-2) configurations have been included in the scattering calculation. A second calculation with lowest 35 levels in the close-coupling expansion has also been carried out to check channel coupling effects on collision strengths. The continuum functions have been represented by the use of B-spline basis. The B-spline R-matrix method in the framework of Breit-Pauli approximation has been used to investigate the electron impact excitation of forbidden and allowed transitions in CII.
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