Dissociative Recombination of the Thioformyl (HCS+) and Carbonyl Sulfide (OCS+) Cations

Details Dissociative Recombination of the Thioformyl (HCS+) and Carbonyl Sulfide (OCS+) Cations Dissociative Recombination of the Thioformyl (HCS+) and Carbonyl Sulfide (OCS+) Cations

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apj...631..653m&link_type=abstract

The Astrophysical Journal, Volume 631, Issue 1, pp. 653-659.

Astronomy and Astrophysics

Astronomy

11

Astrochemistry, Ism: Clouds, Ism: Molecules

Scientific paper

Branching ratios and absolute cross sections have been measured for the dissociative recombination of HCS+ and OCS+ at the CRYRING ion storage ring. In the case of OCS+, the channel leading to CO+S (83%) dominates, whereas the other exoergic pathways leading to CS+O (14%) and C+SO (3%) are of lesser importance. In the case of HCS+, fracture of the CS bond is predominant (81%), with the production of H+CS accounting for the remainder (19%). The cross section of the reaction could be fitted by the expressions σ=1.41×10-15E(eV)-1.11 and 4.47×10-16E(eV)-1.14 cm2 for HCS+ and OCS+, respectively. The derived energy dependences of the thermal reaction rate coefficients can be fitted by k(T)=9.7×10-7(T/300)-0.57 and 3.5×10-7(T/300)-0.62 cm3 s-1 for HCS+ and OCS+, respectively. We use these data to perform model calculations on the HCS+/CS abundance ratio in dark clouds and find that the models using the UMIST and Ohio State University databases have even more difficulty in accounting for the large observed ratio.

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