Rotational excitation of interstellar OH by para- and ortho-H2

Details Rotational excitation of interstellar OH by para- and ortho-H2 Rotational excitation of interstellar OH by para- and ortho-H2

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.257..377o&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 257, no. 3, Aug. 1, 1992, p. 377-390. Research supporte

Astronomy and Astrophysics

Astronomy

29

Hydroxyl Radicals, Interstellar Gas, Ortho Hydrogen, Para Hydrogen, Rotational Spectra, Electron States, Far Infrared Radiation, Ground State, Infrared Space Observatory (Iso), Molecular Clouds, Molecular Collisions, Molecular Energy Levels

Scientific paper

In warm and dense interstellar clouds, the amount of ortho-H2 is comparable to that of para-H2. Yet most models of the excitation of interstellar molecules have considered only para-H2. Calculations are presented of the rate coefficients for rotational excitation of OH by both para- and ortho-H2 in their ground states within the coupled-states formulation. The coupled states results are shown to reproduce satisfactorily the more accurate close-coupling calculations. The importance of inclusion of ortho-H2 (j = 1) in the OH excitation is explored using statistical equilibrium models. In general, the presence of ortho-H2 reduces the asymmetry between the strengths of the two Lambda-doubling components, and affects the results by factors of a few. The conditions under which the OH FIR lines will be observable with the Infrared Space Observatory are investigated.

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