Resonant and nonresonant processes in the formation of CH(+) by radiative association

Details Resonant and nonresonant processes in the formation of CH(+) by radiative association Resonant and nonresonant processes in the formation of CH(+) by radiative association

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...269..796g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 269, June 15, 1983, p. 796-802.

Astronomy and Astrophysics

Astrophysics

26

Association Reactions, Free Radicals, Hydrocarbons, Interstellar Chemistry, Molecular Clouds, Electron States, Fine Structure, Ionizing Radiation, Reaction Kinetics, Temperature Dependence

Scientific paper

New calculations of the radiative association rate coefficient (RARC) for the formation of CH(+) in the interstellar medium are presented. The method applied uses potential curves based on recent experimental data, takes the initial-population-mechanism and resonance-broadening effects of nonadiabatic processes into account, includes the contribution of the A 1-Pi quasi-bound levels between the two fine-structure dissociation limits, and applies the A 1-Pi-CH(+) radiative-lifetime measurements of Mahan and O'Keefe (1981). The RARC is found to be strongly dependent on temperature, rising to a maximum of about 80 x 10 to the -18th cu cm/sec at 30 K and descending monotonically at higher temperatures (calculated up to 1000 K). The low-temperature enhancement is attributed to resonant processes in the A 1-Pi state. These results are shown to partially account for the discrepancy between the observed and predicted abundance of interstellar CH(+).

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