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Pressure and temperature dependence kinetics study of the NO + BrO → NO_2 + Br reaction. Implications for stratospheric bromine photochemistry

Watson, R. T. and Sander, S. P. and Yung, Y. L. (1979) Pressure and temperature dependence kinetics study of the NO + BrO → NO_2 + Br reaction. Implications for stratospheric bromine photochemistry. Journal of Physical Chemistry, 83 (23). pp. 2936-2944. ISSN 0022-3654. doi:10.1021/j100486a002.

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The flash photolysis-ultraviolet absorption technique has been utilized to study the reactivity of nitric oxide with BrO radicals over a wide range of pressure (100-700 torr) and temperature (224-398 K). Pseudo-first-order conditions were used in order to minimize complications caused by secondary kinetic processes. The reaction and its corresponding Arrhenius expression in units of cm^3 molecule^(-1) s^(-1) can be written NO + BrO → NO_2 + Br ΔHº_298 = -17.0 kcal mol^(-1) k_1 = (1.28 ± 0.23) x 10^(-11)exp((181 ± 46)/T) (T = 224-398 K) The results are compared with previous measurements, and atmospheric implications of the reaction are discussed. It is shown that this reaction is important in controlling the ratios [BrO]/[Br] and [BrO]/[HBr] in the stratosphere but that it does not affect the catalytic efficiency of BrO, in ozone destruction.

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Sander, S. P.0000-0003-1424-3620
Yung, Y. L.0000-0002-4263-2562
Additional Information:© 1979 American Chemical Society. Received May 21, 1979. We thank J. Linke for his indispensable glass blowing services, G. Tennant and M. Patapoff for their expert assistance in constructing the experimental apparatus, and J. Pinto for use of the output of our one dimensional photochemical model prior to publication. We benefited greatly from discussions with W. B. DeMore. This paper presents the results of one phase of research carried out at the Jet Propulsion Laboratory, California Institute of Technology, under Contract No. NAS7-100, sponsored by the National Aeronautics and Space Administration. Part of this work was supported by NASA Grant NSG 2229 to the California Institute of Technology.
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Issue or Number:23
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Official Citation: Pressure and temperature dependence kinetics study of the nitric oxide + bromine oxide .fwdarw. nitrogen dioxide + bromine reaction. Implications for stratospheric bromine photochemistry R. T. Watson, S. P. Sander, and Y. L. Yung The Journal of Physical Chemistry 1979 83 (23), 2936-2944
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ID Code:49982
Deposited On:24 Sep 2014 17:19
Last Modified:10 Nov 2021 18:50

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