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The rate of the reaction between CN and C2H2 at interstellar temperaturesThe rate coefficient for the important interstellar reaction between CN and C2H2 has been calculated as a function of temperature between 10 and 300 K. The potential surface for this reaction has been determined through ab initio quantum chemical techniques; the potential exhibits no barrier in the entrance channel but does show a small exit channel barrier, which lies below the energy of reactants. Phase-space calculations for the reaction dynamics, which take the exit channel barrier into account, show the same unusual temperature dependence as determined by experiment, in which the rate coefficient at first increases as the temperature is reduced below room temperature and then starts to decrease as the temperature drops below 50-100 K. The agreement between theory and experiment provides strong confirmation that the reaction occurs appreciably at cool interstellar temperatures.
Document ID
20040089226
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Woon, D. E. (Molecular Research Institute Palo Alto, CA 94304, United States)
Herbst, E.
Date Acquired
August 21, 2013
Publication Date
March 1, 1997
Publication Information
Publication: The Astrophysical journal
Volume: 477
Issue: 1
ISSN: 0004-637X
Subject Category
Exobiology
Funding Number(s)
CONTRACT_GRANT: NAG2-16
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Exobiology
Non-NASA Center