Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.281..666p&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 281, Issue 2, pp. 666-672.
Astronomy and Astrophysics
Astronomy
10
Molecular Processes, Circumstellar Matter, Ism: Abundances, Ism: Clouds, Ism: Molecules
Scientific paper
Pathways to the abundant sulphur-containing carbon chain molecules, CCS and CCCS, are examined. The previously proposed ion/molecule mechanisms for the formation of these species appear satisfactory in the case of CCS, but arguments for the formation of CCCS via ion/molecule reactions rely on several assumptions which do not appear justified in the absence of sufficient experimental evidence. Alternative, radical/neutral pathways to CCS and CCCS (namely the reactions of C_2H with S, and with CS respectively) are proposed which can account for the observed high abundances of these species within TMC-1 and other objects. Thermochemical aspects of the various C_xS production mechanisms are assessed in the light of recent ab initio calculations on the chemical species concerned. Experimental study of the reaction of C_2H with CS is strongly urged.
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