The reaction H + C4H2 - Absolute rate constant measurement and implication for atmospheric modeling of Titan

Details The reaction H + C4H2 - Absolute rate constant measurement and implication for atmospheric modeling of Titan The reaction H + C4H2 - Absolute rate constant measurement and implication for atmospheric modeling of Titan

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.4585n&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, April 1, 1986, p. 4585-4589.

Physics

19

Atmospheric Chemistry, Atmospheric Models, Reaction Kinetics, Satellite Atmospheres, Titan, Acetylene, Atmospheric Composition, Methane, Photochemical Reactions, Photodecomposition, Saturn, Satellites, Titan, Atmosphere, Models, Photochemistry, Methane, Decomposition, Hydrogen, Escape, Diacetylene, Kinetics, Stratosphere, Combustion, Hydrocarbons, Production Rate, Temperature, Parameters, Photolysis, Resonance, Fluorescence, Techniques, Pressure, Reactions

Scientific paper

The absolute rate constant for the reaction H + C4H2 has been measured over the temperature (T) interval 210-423 K, using the technique of flash photolysis-resonance fluorescence. At each of the five temperatures employed, the results were independent of variations in C4H2 concentration, total pressure of Ar or N2, and flash intensity (i.e., the initial H concentration). The rate constant, k, was found to be equal to 1.39 x 10 to the -10th exp (-1184/T) cu cm/s, with an error of one standard deviation. The Arrhenius parameters at the high pressure limit determined here for the H + C4H2 reaction are consistent with those for the corresponding reactions of H with C2H2 and C3H4. Implications of the kinetic carbon chemistry results, particularly those at low temperature, are considered for models of the atmospheric carbon chemistry of Titan. The rate of this reaction, relative to that of the analogous, but slower, reaction of H + C2H2, appears to make H + C4H2 a very feasible reaction pathway for effective conversion of H atoms to molecular hydrogen in the stratosphere of Titan.

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