Rotational excitation of OH by H2 at thermal energies

Details Rotational excitation of OH by H2 at thermal energies Rotational excitation of OH by H2 at thermal energies

Jul 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jphb...14.2179d&link_type=abstract

Journal of Physics B - Atomic and Molecular Physics, vol. 14, July 14, 1981, p. 2179-2190. Research supported by the Science Res

Physics

52

Hydrogen Masers, Hydroxyl Emission, Interstellar Masers, Molecular Excitation, Molecular Rotation, Thermal Energy, Angular Momentum, Ground State, Interstellar Matter, Molecular Energy Levels, Molecular Interactions, Potential Energy

Scientific paper

By the use of a recently computed potential energy surface, cross sections for the rotational excitation of OH by para-H2 (in its rotational ground state) are calculated over the range of energies believed to be relevant to the interstellar OH emission. Results are obtained in Hund's case b coupling scheme (neglecting the spin-orbit interaction) and the significance of departures from case b coupling are considered. The results indicate that collisions with H2 molecules may be expected to invert the populations of the ground rotational state and of certain excited-state Lambda doublets. At low temperatures (T less than approximately 100 K), the inversion mechanism will be quenched by thermalizing collisions between the components of the ground-state Lambda doublet.

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