Collision strengths and excitation rate coefficients for transitions in CA SV

Details Collision strengths and excitation rate coefficients for transitions in CA SV Collision strengths and excitation rate coefficients for transitions in CA SV

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apjs...80..453a&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 80, no. 1, May 1992, p. 453-471. Research supported by SERC.

Astronomy and Astrophysics

Astrophysics

6

Atomic Structure, Calcium, Molecular Collisions, Molecular Excitation, Dirac Equation, Electron Orbitals, Electron Transitions, Fine Structure, Relativistic Effects

Scientific paper

The paper presents collision strengths for transitions among the fine-structure levels of Ca SV in a wide range of energy below 200 Ry. The results were computed in the j-j coupling scheme using the recently developed Dirac-Fock R-matrix program. Contributions of the relativistic effects are assessed and comparisons are made with the earlier available collision strengths. Agreement with the available values, at electron energies above thresholds, is good for most of the transitions, but striking differences (up to an order of magnitude) are noticed for some of the transitions. Effective collision strengths are also obtained after integrating collision strengths over a Maxwellian distribution of electron velocities, and these are tabulated at a number of temperatures below 10 exp 7 K. Comparisons are made with the earlier effective collision strengths obtained with the R-matrix method. Although these results are comparable with the earlier effective collision strengths for most of the transitions, differences of up to a factor of 3 are observed for some of the transitions at temperatures below 1,000,000 K.

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