Query : 2018A&A...615L...2L

2018A&A...615L...2L - Astronomy and Astrophysics, volume 615, L2-2 (2018/7-1)

From interstellar carbon monosulfide to methyl mercaptan: paths of least resistance.


Abstract (from CDS):

The 29 reactions linking carbon monosulfide (CS) to methyl mercaptan (CH3SH) via ten intermediate radicals and molecules have been characterized with relevance to surface chemistry in cold interstellar ices. More intermediate species than previously considered are found likely to be present in these ices, such as trans- and cis-HCSH. Both activation and reaction energies have been calculated, along with low-temperature (T>45K) rate constants for the radical-neutral reactions. For barrierless radical-radical reactions on the other hand, branching ratios have been determined. The combination of these two sets of information provides, for the first time, quantitative information on the full H+CS reaction network. Early on in this network, that is, early on in the lifetime of an interstellar cloud, HCS is the main radical, while later on this becomes first CH2SH and finally CH3S.

Abstract Copyright: © ESO 2018

Journal keyword(s): astrochemistry - ISM: clouds - solid state: volatile - molecular processes

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
1 Barnard 1 MoC 03 33 16.3 +31 07 51           ~ 280 0
2 NAME Ori A MoC 05 38 -07.1           ~ 2774 0
3 NAME IRAS 16293-2422B Y*O 16 32 22.63 -24 28 31.8           ~ 207 0

    Equat.    Gal    SGal    Ecl

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