Transitions in Lambda-doublets of molecules induced by collisions with ions. II

Astronomy and Astrophysics – Astrophysics

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Comets, Electron Transitions, Hydroxyl Emission, Interstellar Gas, Ionic Collisions, Molecular Collisions, Charged Particles, Cross Sections, Neutral Particles, Polarization Characteristics, Rates (Per Time)

Scientific paper

The results of a preceding paper are extended to other values of J and thoroughly discussed. The different multipolar relaxation rates due to ions inside Lambda-doublets are calculated exactly by a semiclassical solution of the close-coupled collision equations. The J-dependence of the results is analyzed. A detailed discussion is given of the conditions of validity of the model and of the possible importance of deviations from a straight-line trajectory and of rotational excitation by ions. In order to compare neutral and charged particle rates, rough estimates are given of Lambda-doublet rates for neutral particles in the interstellar medium and in the atmospheres of comets. Both rates are comparable when the ionization rate is about 0.00001 in the interstellar medium and about 0.0001 in comets.

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