The role of H + OH collisions in pumping the OH 18 centimeter maser lines

Details The role of H + OH collisions in pumping the OH 18 centimeter maser lines The role of H + OH collisions in pumping the OH 18 centimeter maser lines

Apr 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...229l..91k&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 229, Apr. 15, 1979, p. L91-L96.

Astronomy and Astrophysics

Astrophysics

23

Atomic Collisions, Hydrogen Atoms, Hydroxyl Emission, Interstellar Masers, Interstellar Matter, Molecular Collisions, Clouds, Collision Parameters, Ground State, Microwave Emission, Population Inversion

Scientific paper

Cross sections, rate constants, and the steady-state distribution of the various OH sublevels are computed for collisions between H atoms and OH molecules. The results obtained demonstrate that H atoms preferentially excite the upper Lambda levels of the j = 5/2 manifold and that collisional transitions within the j = 3/2 manifold, although much faster than the rotational excitation rates, do not completely equilibrate the nonthermal state distribution induced by radiative decay from the j = 5/2 levels. This phenomenon is shown to be quite general and to exist for a large range of H atom densities and kinetic temperatures.

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