Rotational excitation of OH by H2 at interstellar temperatures

Details Rotational excitation of OH by H2 at interstellar temperatures Rotational excitation of OH by H2 at interstellar temperatures

Mar 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....83...33f&link_type=abstract

Astronomy and Astrophysics, vol. 83, no. 1-2, Mar. 1980, p. 33-37.

Astronomy and Astrophysics

Astrophysics

5

Hydroxyl Emission, Interstellar Masers, Molecular Excitation, Molecular Interactions, Molecular Rotation, Electron Transitions, Ground State, Hydrogen Atoms, Hydroxyl Radicals

Scientific paper

Information on the potential energy of interaction of OH and H2 is assembled with a view to calculating the cross- sections for rotational excitation of OH by H2. The incompleteness of our knowledge of the potential is believed to determine the accuracy of the results, which relate to transitions between the j = 3/2, 5/2, 7/2 rotational levels of the 2Π3/2 ladder. It is shown that collisions with H2 are likely to thermalize rather than invert or anti-invert the populations of the levels of the ground rotational state, responsible for the maser emission observed at a wavelength of 18 cm.

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