Collisional excitation of OH by H2 - Transitions within the ground-state Lambda doublet

Details Collisional excitation of OH by H2 - Transitions within the ground-state Lambda doublet Collisional excitation of OH by H2 - Transitions within the ground-state Lambda doublet

Jul 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jphb...14l.425d&link_type=abstract

Journal of Physics B - Atomic and Molecular Physics, vol. 14, July 14, 1981, p. L425-L429. Research supported by the Science Res

Physics

8

Ground State, Hydrogen Masers, Hydroxyl Emission, Interstellar Masers, Molecular Energy Levels, Molecular Excitation, Electron Transitions, Molecular Interactions, Molecular Rotation, Population Inversion

Scientific paper

The results of calculations of cross sections and rate coefficients for transitions induced by collisions with H2 within the ground-state Lambda doublet of the OH radical are presented. The calculations are relevant to the 18-cm interstellar OH maser emission. The structure observed in the cross section at low energies is attributed to shape resonances. It is found that the combined effects of the rise in the cross section towards threshold and the contribution of the resonances sustain large values of the rate coefficients at low temperature. It is suggested that the mechanism of collisional inversion of the populations of the ground state Lambda doublet (by rotational excitation followed by radiative decay) will be effectively quenched by collisions within the doublet at low temperatures.

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