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An upper limit for the rate coefficient of the reaction of NH2 radicals with O2 using FTIR product analysisFourier transform infrared spectrometry has been used to study the products of the photooxidation of ammonia in the presence of oxygen at 296 K. The data have been used to derive an upper limit of 6 x 10 exp -21/cu cm molecule s for the reaction of NH2 radicals with O2 to produce NO(x) at 296 K. This upper limit, which is three orders of magnitude lower than previous estimates based on the kinetics of NH2 loss, rules out the importance of this reaction in the atmosphere and suggests that NH2 will be oxidized by O3 or NO2. The effect on the NO(x) and N2O budgets depends critically on the products of the NH2 + O3 reaction. Simulations of the experimental product yields also allow an evaluation of possible product channels for the reaction of NH2 with HO2.
Document ID
19920033259
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Tyndall, G. S.
(National Center for Atmospheric Research Boulder, CO, United States)
Orlando, J. J.
(National Center for Atmospheric Research Boulder, CO, United States)
Nickerson, Karen E.
(National Center for Atmospheric Research Boulder, CO, United States)
Cantrell, C. A.
(National Center for Atmospheric Research Boulder, CO, United States)
Calvert, J. G.
(NCAR Boulder, CO, United States)
Date Acquired
August 15, 2013
Publication Date
November 20, 1991
Publication Information
Publication: Journal of Geophysical Research
Volume: 96
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
92A15883
Funding Number(s)
CONTRACT_GRANT: NASA ORDER W-16042
Distribution Limits
Public
Copyright
Other

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