Other
Scientific paper
Jul 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...223..638g&link_type=abstract
Astrophysical Journal, Part 1, vol. 223, July 15, 1978, p. 638-654. ERDA-sponsored research.
Other
46
Chemical Reactions, Comet Nuclei, Reaction Kinetics, Vapor Phases, Abundance, Ammonia, Carbon Dioxide, Methane, Water
Scientific paper
A model of gas-phase chemical kinetics in comet comae has been developed. Its purpose is to allow characterization of comet nuclei by predicting abundances of observable coma species. The one-dimensional calculation follows an isothermal shell of outstreaming molecules, positive ions, and atoms that starts at the nucleus with a simple set of mother molecules. Rate equations for 441 photo and chemical reactions are solved simultaneously at many points in the expansion of the shell. The calculation includes effects of the ultraviolet opacity of the mother molecules. Results are presented for four combinations of hypothetical mother molecules: H2O, CO2, NH3, and CH4. Several species that are not simple photodestruction products of the mother molecules reach large abundances. CO(+), C2, C3, HCN, N2(+), and (probably) CN are underproduced by the model. Additional sources for these species are discussed.
Giguere P. T.
Huebner Walter F.
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