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Pressure dependence of the absolute rate constant for the reaction OH + C2H2 from 228 to 413 KThe pressure dependence of the absolute rate constant for the reaction of the hydroxyl radical with acetylene, important in both atmospheric and combustion chemistry, is determined for temperatures between 228 and 413 K. The flash photolysis-resonance fluorescence technique was employed at five temperatures over wide ranges of pressure and acetylene concentrations, with the OH produced by water photolysis and hydroxyl resonance fluorescent photons measured by multiscaling techniques. Results indicate that, except at the lowest temperature, the bimolecular rate constant for the reaction depends strongly on total pressure, with the pressure effect becoming more pronounced with increasing temperature. At limiting high pressures, the rate constant is found to be equal to 6.83 + or - 1.19 x 10 to the -12th exp (-646 + or - 47/T) cu cm/molecule per sec, where T is the temperature. Results thus demonstrate the importance of environmental conditions in theoretical studies of atmospheric and combustion product compositions
Document ID
19810033368
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Michael, J. V.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Nava, D. F.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Payne, W. A.
(NASA Goddard Space Flight Center Laboratory for Extraterrestrial Physics, Greenbelt, Md., United States)
Stief, L. J.
(NASA Goddard Space Flight Center Laboratory for Extraterrestrial Physics, Greenbelt, Md.; Catholic University of America, Washington, United States)
Borkowski, R. P.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 11, 2013
Publication Date
December 15, 1980
Publication Information
Publication: Journal of Chemical Physics
Volume: 73
Subject Category
Inorganic And Physical Chemistry
Accession Number
81A17772
Distribution Limits
Public
Copyright
Other

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