AbstractOne of the most interesting questions about Titan is the possibility of finding evidence of electrical activity that could lead to some chemical transformations of its nitrogen and methane rich atmosphere. Following the proposal by Navarro-González and Ramírez, (Navarro-González, R., Ramírez, S.I., Corona discharge of Titan’s troposphere, Adv. Space Res. 19 (7), 1121–1133, 1997.) on the likelihood of the presence of electrical discharges developing in Titan’s low atmosphere, we present here the energy yields of 24 hydrocarbons and six nitriles synthesized by positive and negative corona discharges from mixtures of methane and nitrogen at 298K. We have investigated the effect of the methane mixing ratio (0.02–0.1), gas pressure (100–1000mbar), the electrical polarity of the corona discharge and the design of the reactor on the energy yields of the identified gas-phase organic products. Our results show that the synthesis of molecules containing 2 or 3 carbon atoms is slightly favoured by an initial gas pressure of 1000mbar. Ethane and methanenitrile have the highest energy yields at a methane mixing ratio of 0.05. These molecules could be the precursors of heavier hydrocarbons and nitriles identified in our experiments at higher exposure times. Saturated hydrocarbons and nitriles have higher energy yields in positive corona discharge. We present and discuss these results in the frame of the Cassini–Huygens mission.


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    Title :

    Organic chemistry induced by corona discharges in Titan’s troposphere: Laboratory simulations



    Published in:

    Advances in Space Research ; 36 , 2 ; 274-280


    Publication date :

    2005-09-09


    Size :

    7 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    Corona Discharge of Titan's Troposphere

    Navarro-Gonzalez, R. / Ramirez, S. I. / COSPAR; Scientific assembly; 31st | British Library Conference Proceedings | 1997



    Organic Chemistry in Titan's Atmosphere: New Data From Laboratory Simulations at Low Temperature

    Coll, P. / Coscia, D. / Gazeau, M. C. et al. | British Library Conference Proceedings | 1995


    Titan's Organic Chemistry and Exobiology

    Raulin, F. | British Library Online Contents | 1997