On the theory of H + OH/2Pi/ collisions and interstellar OH maser action

Details On the theory of H + OH/2Pi/ collisions and interstellar OH maser action On the theory of H + OH/2Pi/ collisions and interstellar OH maser action

Sep 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jchph..71.2182s&link_type=abstract

Journal of Chemical Physics, vol. 71, Sept. 1, 1979, p. 2182-2193.

Physics

Chemical Physics

45

Atomic Collisions, Hydrogen Atoms, Hydroxyl Emission, Interstellar Masers, Molecular Collisions, Reaction Kinetics, Angular Momentum, Born-Oppenheimer Approximation, Electron Transitions, Hyperfine Structure, Line Spectra, Molecular Excitation, Molecular Rotation, Water

Scientific paper

The role of H atom collisions as a pump for the 18 cm OH maser lines in interstellar sources is considered. Theory of 2Pi molecules with a doublet-state atom is formulated, and expressions for the interaction matrix between the sublevels of the H(2S) + OH(2Pi) system are derived and correlated to the H2O Born-Oppenheimer states. The interaction matrix thus derived is used to obtain cross-sections and rate constants between the j = 3/2 and j = 5/2 rotational manifolds. Selectivity of the H + OH collision is discussed, and the collisional rate constants are used in a simple cloud model in which radiative decay and effects of background radiation are also incorporated. The model is solved for a wide range of H atom densities. Nonthermal, and often inverted Lambda level populations were shown to exist for a variety of kinetic temperatures and densities, suggesting that collisions with H serve as a major pump source of all four 18 cm emission lines.

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