Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jphb...16..285h&link_type=abstract
Journal of Physics B - Atomic and Molecular Physics, vol. 16, Jan. 28, 1983, p. 285-295.
Astronomy and Astrophysics
Astrophysics
21
Astrophysics, Collision Rates, Electron Impact, Ionic Collisions, Oxygen Isotopes, Astronomy, Electron Energy, Electron States, Novae, Planetary Nebulae
Scientific paper
The collision strengths for the excitation of the n = 2 terms in O IV from the ground and metastable terms are determined for energies from the first excitation threshold to 5.6 Ryd in a close-coupling approximation. The collision strengths at a fine energy mesh are generated using the analytic fits derived from the resonance structure obtained in the reactance matrices. The rate coefficients for temperatures between 10,000-200,000 K are then obtained by integrating these collision strengths. It is found that this method of calculation offers an improvement over previous calculations due to the inclusion of closed-channel resonances which can increase the rate coefficients for the intercombination transitions considerably, an increase of nearly a factor of two for the 4P-2P transition.
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