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The sensitivity of gas-phase models of dense interstellar clouds to changes in dissociative recombination branching ratiosThe approach of Bates to the determination of neutral product branching ratios in ion-electron dissociative recombination reactions has been utilized in conjunction with quantum chemical techniques to redetermine branching ratios for a wide variety of important reactions of this class in dense interstellar clouds. The branching ratios have then been used in a pseudo time-dependent model calculation of the gas phase chemistry of a dark cloud resembling TMC-1 and the results compared with an analogous model containing previously used branching ratios. In general, the changes in branching ratios lead to stronger effects on calculated molecular abundances at steady state than at earlier times and often lead to reductions in the calculated abundances of complex molecules. However, at the so-called 'early time' when complex molecule synthesis is most efficient, the abundances of complex molecules are hardly affected by the newly used branching ratios.
Document ID
19880050528
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Millar, T. J.
(University of Manchester Institute of Science and Technology United Kingdom)
Defrees, D. J.
(Molecular Research Institute Palo Alto, CA, United States)
Mclean, A. D.
(IBM Almaden Research Center San Jose, CA, United States)
Herbst, E.
(Duke University Durham, NC, United States)
Date Acquired
August 13, 2013
Publication Date
April 1, 1988
Publication Information
Publication: Astronomy and Astrophysics
Volume: 194
Issue: 1-2
ISSN: 0004-6361
Subject Category
Astrophysics
Accession Number
88A37755
Funding Number(s)
CONTRACT_GRANT: NAG2-16
CONTRACT_GRANT: NSF AST-85-13151
Distribution Limits
Public
Copyright
Other

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