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

Abstract

view Abstract Citations (36) References (19) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Resonant and nonresonant processes in the formation of CH(+) by radiative association Graff, M. M. ; Moseley, J. T. ; Roueff, E. Abstract 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(+). Publication: The Astrophysical Journal Pub Date: June 1983 DOI: 10.1086/161088 Bibcode: 1983ApJ...269..796G Keywords: Association Reactions; Free Radicals; Hydrocarbons; Interstellar Chemistry; Molecular Clouds; Electron States; Fine Structure; Ionizing Radiation; Reaction Kinetics; Temperature Dependence; Atomic and Molecular Physics full text sources ADS |