Physics – Atomic Physics
Scientific paper
Apr 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apjs...72..815a&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 72, April 1990, p. 815-829. Research supported by SERC.
Physics
Atomic Physics
10
Atomic Energy Levels, Atomic Physics, Calcium, Electron Scattering, Fine Structure, Electron Energy, Electron Transitions, Ground State, Relativistic Effects, Solar Flares, Wave Functions
Scientific paper
The R-matrix program is used to calculate collision strengths Omega for 190 fine-structure transitions among the 1s2 2s2 2p2, 1s2 2s 2p3, and 1s2 2p4 configurations of Ca XV in the energy range of 0-100 Ry. Relativistic effects are included in the computations of Omega through term coupling coefficients. The effective collision strengths Tau, obtained by averaging Omega over a Maxwellian distribution of electron velocities, are listed for all transitions in the temperature range of 10 to the 6th to 10 to the 7th K. The effects on the calculated Omega and Tau values of term coupling and configuration-interaction in the target are examined, and the importance of including relativistic effects is noted, particularly for spin and parity changing transitions at the higher energies and temperatures.
Aggarwal Kanti M.
Berrington Keith A.
Keenan Francis P.
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