Physics
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978mnras.183p..89p&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 183, June 1978, p. 89P-92P. Research supported by the Science Research C
Physics
71
Electron Impact, Electron Transitions, Fine Structure, Interstellar Chemistry, Nebulae, Reaction Kinetics, Sulfur, Atomic Collisions, Cloud Physics, Electron Scattering, Energy Distribution, Nuclear Quadrupole Resonance, Oxygen Ions, Quantum Mechanics, Spectral Energy Distribution
Scientific paper
It is pointed out that data concerning the reaction rates for the fine-structure transitions in O II and S II are required for interpreting the observations from gaseous nebulae. Reaction-rate parameters representing integrals involving the collision strength have been calculated by Pradhan (1976) for O II. In the reported investigation, approaches are shown for improving the collision strengths and hence the reaction-rate parameters. The approaches are employed to obtain the reaction-rate parameters for the fine-structure transitions within the ground configuration of S II. In the calculations use is made of the close-coupling approximation in order to obtain the reactance matrices and the collision strengths. The configuration interaction between the ground configuration and other high-lying configurations has been disregarded in the calculations.
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