Organo-sulfur chemistry in dense interstellar clouds via S(+)-hydrocarbon reactions

Details Organo-sulfur chemistry in dense interstellar clouds via S(+)-hydrocarbon reactions Organo-sulfur chemistry in dense interstellar clouds via S(+)-hydrocarbon reactions

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...200..191s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 200, no. 1-2, July 1988, p. 191-194. Research supported by SERC and USAF.

Astronomy and Astrophysics

Astrophysics

30

Hydrocarbons, Interstellar Chemistry, Molecular Clouds, Organic Sulfur Compounds, Abundance, Ground State, Molecular Ions, Reaction Kinetics

Scientific paper

Because S+ is predicted via current model calculations to be an abundant ion in dense interstellar clouds, it might be expected to play a role in the synthesis of organo-sulfur compounds via ion-molecule reactions. In particular, the newly observed interstellar molecule CCS is probably formed via a reaction sequence initiated by the reaction between S+ and acetylene (C2H2) to produce the organo-sulfur ion HC2S+ and H. Calculations based on models of dense interstellar clouds show that the abundance of CCS achieved via this synthesis may be only a factor of 6 - 7 below observation in TMC-1. In order to assess the importance of S+-hydrocarbon reactions in the chemistry of dense interstellar clouds, the authors have measured a variety of these reactions. In general, the results show that S+-hydrocarbon reactions sometimes exhibit a sulfur-insertion channel leading to organo-sulfur ionic species but that other channels, especially charge exchange, tend to dominate for the larger and more saturated hydrocarbons studied.

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