Collision Strengths for Electron Collisional Excitation of S II

Details Collision Strengths for Electron Collisional Excitation of S II Collision Strengths for Electron Collisional Excitation of S II

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apjs..111..459t&link_type=abstract

Astrophysical Journal Supplement v.111, p.459

Astronomy and Astrophysics

Astronomy

11

Atomic Data, Atomic Processes

Scientific paper

Electron collisional excitation strengths for inelastic transitions in S II are calculated using the R-matrix method in a 19-state (3s23p3 4So, 2Do, 2Po, 3s3p4 4P, 2D, 2S, 3s23p23d 2P, 4F, 4D, 2F, 4P, 3s23p24s 4P, 2P, 3s23p24p 2So, 4Do, 4Po, 2Do, 4So, 2Po) close-coupling approximation. These target states are represented by extensive configuration-interaction wave functions that give excitation energies and oscillator strengths that are usually in good agreement with the experimental values and the available accurate calculations. The present results for collision strengths are in very good agreement with the recent merged beams energy loss measurement of Liao et al. and agree reasonably well with the 18-state R-matrix calculation of Ramsbottom, Bell, & Stafford, but show significant differences from the 12-state R-matrix calculation of Cai & Pradhan.

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