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Dark cloud chemistry in initially H-rich regions

Rawlings, J.M.C., Hartquist, T.W., Williams, D.A. and Falle, S.A.E.G. (2002) Dark cloud chemistry in initially H-rich regions. Astronomy and Astrophysics, 391 (2). pp. 681-687. ISSN 0004-6361

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The chemistry in dark regions of dense cores is explored as a function of the initial abundance ratio of H to H 2, on the assumption that some cores form on a timescale and are younger than the time required for the H :H 2 ratio to attain its equilibrium value. Observational diagnostics of non-equilibrium values of the initial H :H 2 ratio are identified. In initially H-rich material, the abundances of OH, NH 3, CN, and HNC are for some time higher than they are in initially H-poor material. In initially H-poor regions, the abundances of CO, species containing multiple carbon atoms in each molecule, and CS are larger for an (observationally significant) period than in initially H-rich material.

Item Type: Article
Copyright, Publisher and Additional Information: © ESO 2002
Keywords: ISM, clouds, molecules, astrochemistry, molecular processes
Institution: The University of Leeds
Academic Units: The University of Leeds > Faculty of Maths and Physical Sciences (Leeds) > School of Physics and Astronomy (Leeds)
The University of Leeds > Faculty of Maths and Physical Sciences (Leeds) > School of Mathematics (Leeds) > Applied Mathematics (Leeds)
Depositing User: Repository Assistant
Date Deposited: 02 Jun 2006
Last Modified: 12 Jun 2014 16:38
Published Version: http://dx.doi.org/10.1051/0004-6361:20020825
Status: Published
Publisher: EDP Sciences
Refereed: Yes
Identification Number: 10.1051/0004-6361:20020825
URI: http://eprints.whiterose.ac.uk/id/eprint/1253

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