Effective Collision Strengths for Fine-Structure Transitions in S I

Details Effective Collision Strengths for Fine-Structure Transitions in S I Effective Collision Strengths for Fine-Structure Transitions in S I

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apjs..153..581t&link_type=abstract

The Astrophysical Journal Supplement Series, Volume 153, Issue 2, pp. 581-593.

Astronomy and Astrophysics

Astronomy

5

Atomic Data, Atomic Processes, Line: Formation

Scientific paper

Electron collisional excitation strengths for transitions between the 3s23p43P2,1,0, 1D2, and 1S0 levels and from these levels to the 58 fine-structure levels of the excited configurations of neutral sulfur are calculated using the B-spline R-matrix approach. The nonorthogonal orbitals are used for an accurate representation of both the target states and the R-matrix basis functions. The close-coupling expansion consists of the 27 spectroscopic bound and autoionizing target states that give rise to 63 fine-structure levels. We included the lowest 22 LS states of the 3s23p4, 3s23p34s, 3s23p34p, 3s23p33d, 3s23p34d, 3s23p34f, 3s23p35s, 3s23p35p, 3s23p36s, and 3s3p5 configurations, and five higher lying 3s23p3(2Po)4s3Po, 1Po, 3s23p3(2Do)3d 3Po, 1Po, and 3s3p51Po states that have strong dipole connection with the ground terms. The collision strengths for transitions between fine-structure levels are calculated by transforming the LS-coupled K-matrices to K-matrices in an intermediate coupling scheme. The effective collision strengths are determined by integrating collision strengths over a Maxwellian distribution of electron energies. The effective collision strengths are tabulated for logT from 3.3 to 5.6 K suitable for applications in astrophysical plasma modeling.

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