Direct measurements of rate coefficients for the reaction of ethynyl radical <formula>(C2H) with <formula>C2H2 at 90 and 120 K using a pulsed Laval nozzle apparatus

Details Direct measurements of rate coefficients for the reaction of ethynyl radical <formula>(C2H) with <formula>C2H2 at 90 and 120 K using a pulsed Laval nozzle apparatus Direct measurements of rate coefficients for the reaction of ethynyl radical <formula>(C2H) with <formula>C2H2 at 90 and 120 K using a pulsed Laval nozzle apparatus

Jun 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jgr...10515085l&link_type=abstract

Journal of Geophysical Research, Volume 105, Issue E6, p. 15085-15090

Physics

13

Atmospheric Composition And Structure: Chemical Kinetic And Photochemical Properties, Planetology: Solid Surface Planets: Atmospheres-Evolution, Planetology: Solar System Objects, Planetology: Solar System Objects: Saturnian Satellites

Scientific paper

Rate coefficients for the reaction C2H+C2H2->C4H2+H are measured at 90 and 120 K by using a new pulsed Laval nozzle apparatus equipped with laser ionization, time-of-flight mass spectrometric detection. The C2H radicals are generated by 193 nm laser photolysis of C2H2, and the reaction product, C4H2, is directly detected by single-photon ionization at 118 nm (10.5 eV). Rate coefficients of (2.7+/-0.5)×10-10 and (2.5+/-0.4)×10-10cm3molecule-1s-1 are obtained at 90 and 120 K, compared to the room temperature value of 1.3×10-10cm3molecule-1s-1. The results show a significant negative temperature dependence of the reaction rate coefficient below room temperature. The implications for models of planetary atmospheres, such as for Titan, are discussed.

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