Fast neutral reactions in cold interstellar clouds

Details Fast neutral reactions in cold interstellar clouds Fast neutral reactions in cold interstellar clouds

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...339..239g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 339, April 1, 1989, p. 239-243.

Other

47

Interstellar Chemistry, Interstellar Matter, Molecular Clouds, Exothermic Reactions, Fine Structure, Free Radicals, Spin-Orbit Interactions, Temperature Dependence

Scientific paper

The dynamics of exothermic neutral reactions between radical species are considered. The adiabatic capture-infinite order sudden approximation method is used to develop analytic expressions for cross sections and rate constants of exothermic reactions between atoms and dipolar radicals at low temperatures. A method for approximating the adiabatic potential surface for the reactive state is presented. Rate constants are calculated for the reaction systems O + OH and O + CH, both of which are predicted to be fast at low temperatures. The systems C + CH and C + OH are expected to be nonreactive at low temperatures, and upper limits of rate constants for these reactions have been estimated. General predictions are made for other reaction systems. Implications for interstellar chemistry are discussed.

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