Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mnras.336..283r&link_type=abstract
Monthly Notice of the Royal Astronomical Society, Volume 336, Issue 1, pp. 283-290.
Astronomy and Astrophysics
Astronomy
33
Astrochemistry, Molecular Processes, Ism: Abundances, Ism: Clouds, Ism: Molecules
Scientific paper
Rate coefficients for deuterium fractionation reactions that are important at low temperatures have recently been studied at 10 K in the laboratory for the first time. In this paper, we incorporate these newly measured rates, or values based on them, into existing models of gas-phase interstellar deuterium chemistry. We then compare our results with those obtained previously and with observations of deuterated molecules in dark clouds, specifically TMC-1, L134N and L1544. In general, the new rates tend to reduce the amount of fractionation that can occur in the gas, which may present problems in regions where high molecular deuterium/hydrogen ratios have been observed.
Herbst Eric
Millar Thomas J.
Roberts Helen
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