Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....61..405b&link_type=abstract
Astronomy and Astrophysics, vol. 61, no. 3, Nov. 1977, p. 405-410.
Astronomy and Astrophysics
Astrophysics
19
Electron Transitions, Hyperfine Structure, Interstellar Gas, Ionic Collisions, Molecular Collisions, Hydroxyl Emission, Line Spectra, Transition Probabilities
Scientific paper
Results of an exact semiclassical numerical solution to the differential equations of strong collisions are presented for the case of a Lambda-doublet with J equals 3/2. Cross sections are derived in terms of reduced parameters; these cross sections allow the transition rates for any J equals 3/2 Lambda-doublet to be calculated for any relevant value of the relative velocity. The results obtained are applied to the ground state of OH, for which the different hyperfine transition rates are computed as a function of temperature. It is shown that a previously employed semiclassical approximation considerably overestimates the transition rates due to ions at low temperatures and that the ionic rates are not negligible in comparison with the electronic rates at intermediate temperatures.
Bouloy D.
Omont Alain
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