Low temperature (39-298 K) kinetics study of the reactions of the C4H radical with various hydrocarbons observed in Titan's atmosphere |
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| Authors: | Coralie Berteloite Petre Birza André Canosa Ian R Sims |
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| Institution: | a Institut de Physique de Rennes, UMR UR1-CNRS 6251, Université de Rennes 1, Equipe “Astrochimie Expérimentale,” Bât. 11C, Campus de Beaulieu, F-35042 Rennes Cedex, France
b Universités Paris 12 et 7, Laboratoire Interuniversitaire des Systèmes Atmosphériques, UMR CNRS-Université No. 7583, Faculté des Sciences et Technologie, 61 avenue du Général de Gaulle, 94010 Creteil Cedex, France |
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| Abstract: | The reaction kinetics of the butadinyl radical, C4H, with various hydrocarbons detected in the atmosphere of Titan (methane, ethane, propane, acetylene, ethene and methylacetylene) are studied over the temperature range of 39-298 K using the Rennes CRESU (Cinétique de Réaction en Ecoulement Supersonique Uniforme) apparatus. Kinetic measurements were made using the pulsed laser photolysis—laser induced fluorescence technique. The rate coefficients, except for the reaction with methane, all show a negative temperature dependence and can be fitted with the following expressions over the temperature range of this study:  ;  ;  ,  ,  . These expressions are not intended to be physically meaningful but rather to provide an easy way to introduce experimental results in photochemical models. They are only valid over the temperature range of the experiments. Possible channels of these reactions are discussed as well as possible consequences of these results for the production of large molecules and hazes in the atmosphere of Titan. These results should also be considered for the photochemistry of Giant Planets. |
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| Keywords: | Titan Atmospheres chemistry Organic chemistry Atmospheres composition |
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