The formation of interstellar HCS/+/

Details The formation of interstellar HCS/+/ The formation of interstellar HCS/+/

Nov 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...225..857m&link_type=abstract

Astrophysical Journal, Part 1, vol. 225, Nov. 1, 1978, p. 857-859.

Other

13

Abundance, Hydrogen Compounds, Interstellar Chemistry, Interstellar Matter, Molecular Ions, Sulfides, Carbon Compounds, Reaction Kinetics

Scientific paper

Results are reported for an experimental study in which the proton affinity of CS and the heat of formation of HCS(+) were determined by ion-cyclotron resonance spectroscopy. The proton affinity of CS is found to be 730 + or - 19 kJ/mol, and the heat of formation of HCS(+) is estimated to be possibly as low as 940 kJ/mol. Fifteen exothermic reactions for HCS(+) formation in interstellar clouds where CS is already present are considered, two of these reactions are shown to be most important, and an expression for the HCS(+) abundance is obtained. HCS(+) abundances are computed for H2 densities of 10,000 to 1 million per cu cm. The results indicate that the two sources of HCS(+) (i.e., H2S and CS) contribute approximately in the ratio of their abundances and that HCS(+) should have an abundance of about 4 trillionths relative to H2.

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