Oxygen chemistry of shocked interstellar clouds. I - Rate constants for thermal and nonthermal internal energy distributions

Details Oxygen chemistry of shocked interstellar clouds. I - Rate constants for thermal and nonthermal internal energy distributions Oxygen chemistry of shocked interstellar clouds. I - Rate constants for thermal and nonthermal internal energy distributions

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...317..423w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 317, June 1, 1987, p. 423-431. Research supported by the Smithsonian Instit

Astronomy and Astrophysics

Astrophysics

39

Energy Distribution, Interstellar Chemistry, Molecular Clouds, Oxygen Spectra, Shock Wave Interaction, Fine Structure, Hydrogen Clouds, Molecular Rotation, Reaction Kinetics, Vibrational Spectra

Scientific paper

Thermal rate constants are calculated explicitly for critical postshock oxygen-hydrogen reactions over the temperature range 300 - 5000 K. Substantial differences both from simple exponential behavior and from values used in shock studies are documented. The influence of internal energy on the rate constants is studied. Transition state theory is used to determine rate constants for vibrationally cold reactants. The results of previous studies of rotational effects for selected reactions are applied to the astrophysical situation. The influence of fine structure on reactivity is examined. Nonthermal rotational, vibrational, and fine structure populations are all shown to have a bearing on the reaction rates for important reactions in shocked interstellar clouds.

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