Computer Science
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995icar..115..119c&link_type=abstract
Icarus (ISSN 0019-1035), vol. 115, no. 1, p. 119-125
Computer Science
26
Atmospheric Composition, Cyanoacetylene, Hydrogen Recombinations, Photodissociation, Titan, Ethane, Irradiation, Methane, Photodecomposition, Quantum Efficiency, Reaction Kinetics
Scientific paper
The quantum yield and reaction threshold for the photochemical dissociation of cyanoacetylene into a hydrogen atom and the cyanoethynyl radical have been determined. The quantum yield at 185 nm is approximately 0.09. The threshold is approximately 240 nm. Combination of this data with literature values shows that production of excited-state cyanoacetylene is the major primary process resulting from irradiation between 185 and 254 nm. Also determined are the relative rate constants for the abstraction of a hydrogen atom from hydrogen, methane, and ethane by the cyanoethynyl radical (k(H2):k(CH4):k(C2H6) = 1:9.3:63). Implications of these results for the proposal that hydrogen abstraction plays an important role in the conversion of methane to ethane and in the protection of unsaturated compounds from photo-consumption in the atmosphere of Titan are discussed.
Clarke David W.
Ferris James P.
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