Other
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.216.1025m&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 216, Oct. 15, 1985, p. 1025-1031. SERC-USAF-supported r
Other
32
Abundance, Interstellar Chemistry, Interstellar Matter, Molecular Ions, Sulfides, Chemical Reactions, Hydrogen Compounds, Polyatomic Molecules, Positive Ions, Protons
Scientific paper
The ion-molecule reactions and ion-electron recombination of HCS(+) has been studied in a variety of laboratory experiments at room temperature. CS has a very large proton affinity so that many reactions can lead to HCS(+), which was found to be unreactive with nearly all abundant interstellar molecules. In addition the dissociative recombination rate coefficient of HCS(+) was the lowest measured for a heavy polyatomic ion. New calculations of the rate coefficient for the H(3+)-CS reaction are presented, and it is found that this increases by an order of magnitude as the temperature decreases from 300 to 10 K. These theoretical data, together with the laboratory results, makes it possible to explain the high HCS(+)/CS forbidden line ratio observed in TMC-1. The observed HCS(+)/CS forbidden line ratio may be used to give information on the relative abundance of metal to non-metal ions, while other ions, such as HSO(2+, may be abundant enough to be detectable in interstellar clouds.
Adams Nigel G.
Clary David C.
Millar Thomas J.
Smith Douglas
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