Rotational excitation of OH by H2 - Calculations in intermediate coupling

Details Rotational excitation of OH by H2 - Calculations in intermediate coupling Rotational excitation of OH by H2 - Calculations in intermediate coupling

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jphb...16.2157d&link_type=abstract

Journal of Physics B - Atomic and Molecular Physics (ISSN 0022-3700), vol. 16, June 28, 1983, p. 2157-2168. Research supported b

Physics

34

Coupling, Hydrogen, Hydroxyl Emission, Interstellar Chemistry, Molecular Excitation, Molecular Rotation, Angular Momentum, Electron Orbitals, Molecular Collisions, Molecular Energy Levels, Molecular Interactions, Quantum Mechanics, Spin-Orbit Interactions

Scientific paper

The results of calculations of cross sections for the rotational excitation of OH by para-H2 are presented. The calculations are performed in the angular momentum coupling scheme appropriate to the OH radical, intermediate between Hund's cases a and b. Comparison with previous rsults, obtained in the case b limit, shows that the principal effect of the spin-orbit interaction is to reduce the asymmetries in the cross sections which lead to preferential excitation of a given component of a lambda doublet. Nevertheless, the asymmetries remain large, and rotational excitation by H2 may be expected to play an important role in producing the maser emission from the lambda doublets in the 2Pi(3/2) ladder, observed in the interstellar medium.

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