Collisional excitation of OH by H2 in the interstellar medium

Details Collisional excitation of OH by H2 in the interstellar medium Collisional excitation of OH by H2 in the interstellar medium

May 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.199..457d&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 199, May 1982, p. 457-463. Research supported by the Science Research C

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16

Hydrogen, Hydroxyl Emission, Interstellar Masers, Interstellar Matter, Molecular Collisions, Molecular Excitation, Collision Rates, Molecular Rotation, Population Inversion, Spin-Orbit Interactions

Scientific paper

Bertojo et al. (1976) have proposed that the inversion of population responsible for the OH maser emission may be induced by heavy particle impact. As H2 is likely to be an important partner in OH maser regions, Kochanski and Flower (1981) have evaluated the OH-H2 interaction potential, using an ab initio method. These calculations provide the minimal information on the anisotropy of the OH-H2 interaction which is required to determine the absolute values of the cross sections for the rotational excitation of OH by H2. Results of initial calculations of rotational excitation cross sections have been reported by Dewangan and Flower (1981). The present discussion is concerned with the results of the complete calculations in a form which is amenable to astrophysical applications, viz. as collisional rate coefficients, obtained on integrating the cross sections over a Maxwellian distribution. Attention is given to the reliability of the obtained results and their astrophysical significance.

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