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An experimental study of the reaction kinetics of C2(X1Σg+) with hydrocarbons (CH4, C2H2, C2H4, C2H6 and C3H8) over the temperature range 24–300 K: Implications for the atmospheres of Titan and the Giant Planets
The reactivity of C 2 (X 1 Σ +g ) with simple saturated (CH 4 , C 2 H 6 and C 3 H 8 ) and unsaturated (C 2 H 2 and C 2 H 4 ) hydrocarbons has been studied in the gas phase over the temperature range 24–300 K using the CRESU (Cinétique de Réaction en Ecoulement Supersonique Uniforme or Reaction Kinetics in a Uniform Supersonic Flow) technique. All reactions have been found to be very rapid in this temperature range and the rate coefficients are typically ⩾10 −10 cm 3 molecule −1 s −1 with the exception of methane for which the rate coefficient is one order of magnitude lower: ∼10 −11 cm 3 molecule −1 s −1 . These results have been analyzed in terms of potential destruction sources of C 2 (X 1 Σ +g ) in the atmospheres of Titan and the Giant Planets. It appears that the rate coefficient of the reaction 1 C 2 +CH 4 should be updated with our new data and that reactions with C 2 H 2 , C 2 H 4 and C 2 H 6 should also be included in the existing photochemical models.
Laboratoire PALMS, UMR CNRS-Université no. 6627, Equipe “Astrochimie Expérimentale,” Campus de Beaulieu, Bât. 11C, Université de Rennes 1, 35042 Rennes Cedex, France
School of Chemistry, University of Birmingham, Edgbaston B15 2TT, Birmingham, UK
Laboratoire PALMS, UMR CNRS-Université no. 6627, Equipe “Astrochimie Expérimentale,” Campus de Beaulieu, Bât. 11C, Université de Rennes 1, 35042 Rennes Cedex, France
Laboratoire PALMS, UMR CNRS-Université no. 6627, Equipe “Astrochimie Expérimentale,” Campus de Beaulieu, Bât. 11C, Université de Rennes 1, 35042 Rennes Cedex, France
Laboratoire PALMS, UMR CNRS-Université no. 6627, Equipe “Astrochimie Expérimentale,” Campus de Beaulieu, Bât. 11C, Université de Rennes 1, 35042 Rennes Cedex, France