Collision strengths for dipole-allowed transitions in S II

Details Collision strengths for dipole-allowed transitions in S II Collision strengths for dipole-allowed transitions in S II

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...351..701h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 351, March 10, 1990, p. 701-704.

Astronomy and Astrophysics

Astrophysics

6

Electron Impact, Electron Scattering, Io, Sulfur, Transition Probabilities, Ultraviolet Spectra, Atomic Excitations, Electron Transitions, Emission Spectra, Line Spectra, Oxygen Ions, Wave Functions

Scientific paper

Calculations of collision strengths for electron-impact excitations of S II from the ground state 3p3 4S0 to excited states 3p4 4P, 3d 4F, 3d 4D, 4s 4P, and 3d 4P were carried out using the R-matrix code described by Berrington et al. (1978) and the NIEM code described by Henry et al. (1981). Results are presented for the thermally averaged collision strengths for the five-state and six-state calculations. Convergence behaviors were examined by comparison with the six-state calculations and the previously obtained two-state calculations. Uncertainties for these transitions were estimated to be within 20 percent, except for the 4S0 - 3p4 4P transition in which a 40 percent uncertainty was estimated.

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