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Laboratory kinetics of C2H radical reactions with ethane, propane and n-butane at T = 96-296 K: Implicatiions for Titan



J E. Murphy, A B. Vakhtin, S R. Leone


The kinetics of the reactions of C2H radical with ethane (K1), propane (k2), and n-butane (k3) are studied over the temperature range of T=96-296 K with a pulsed Laval nozzle apparatus that utilizes a pulsed laser photolysis/chemiluminescence technique. The C2H decay profiles in the presence of both the alkane reactant and O2 are monitored by the CH(A2Δ}) chemiluminescence tracer method. The results, together with available literature data, yield the following Arrhenius expressions: k1(T) = (0.51 ± 0.06) x 10-10 exp [(-76 ± 30) K/T] cm3 molecule-1s-1 (T = 96 K to 800 K), k2(T) = (0.98 ± 0.32) x 10-10 exp[(-71 + or-} 60) K/T] cm3 molecule-1s-1 (T = 96 K to 361 K), and k3(T) = (1.23 ± 0.26) x 10-10 cm3 molecule-1s-1 (T = 96 K to 297 K). At T = 296 K, k1 is measured as a function of total pressure and has little or no pressure dependence. The results from this work support a direct hydrogen abstraction mechanism for the title reactions. Implications to the atmospheric chemistry of Titan are discussed.
No. 1


C<sub>2</sub>H radical reactions, stratopheric mixing, Titan


Murphy, J. , Vakhtin, A. and Leone, S. (2003), Laboratory kinetics of C<sub>2</sub>H radical reactions with ethane, propane and n-butane at T = 96-296 K: Implicatiions for Titan, Icarus (Accessed December 10, 2023)
Created April 30, 2003, Updated October 12, 2021