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Measurements of quantum yields of bromine atoms in the photolysis of bromoform from 266 to 324 nm

Bayes, Kyle D. and Toohey, Darin W. and Friedl, Randall R. and Sander, Stanley P. (2003) Measurements of quantum yields of bromine atoms in the photolysis of bromoform from 266 to 324 nm. Journal of Geophysical Research. Atmospheres, 108 (D3). Art. No. 4095. ISSN 2169-897X. doi:10.1029/2002jd002877.

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The quantum yield for the formation of bromine atoms in the photolysis of bromoform, CHBr_3, has been measured between 266 and 324 nm. For 303 to 306 nm the quantum yields are unity within the experimental uncertainty of the measurements. At longer wavelengths, where the bromoform cross sections decrease rapidly, an apparent trend to slightly lower quantum yields is probably the result of systematic and random errors or incorrect CHBr_3 absorption cross sections. Support for a unit quantum yield for all wavelengths longer than 300 nm comes from the recent theoretical calculations of Peterson and Francisco. At 266 nm the bromine atom quantum yield is 0.76 (±0.03), indicating that at least one additional dissociation channel becomes important at shorter wavelengths. For modeling of the troposphere, it is recommended that a quantum yield of unity be used for wavelengths of 300 nm and longer.

Item Type:Article
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Toohey, Darin W.0000-0003-2853-1068
Sander, Stanley P.0000-0003-1424-3620
Additional Information:© 2003 by the American Geophysical Union. Received 23 August 2002; revised 4 November 2002; accepted 4 December 2002; published 5 February 2003. The authors would like to thank Joseph Francisco and William Jackson for prepublication copies of their manuscripts and David Natzic for expert assistance in constructing the flow tube. The research described in this paper was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under contract to the National Aeronautics and Space Administration.
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Subject Keywords:bromoform; bromine atoms; quantum yield; photolysis
Issue or Number:D3
Record Number:CaltechAUTHORS:20181127-160003989
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Official Citation:Bayes, K. D., D. W. Toohey, R. R. Friedl, and S. P. Sander (2003), Measurements of quantum yields of bromine atoms in the photolysis of bromoform from 266 to 324 nm, J. Geophys. Res., 108, 4095, doi: 10.1029/2002JD002877, D3.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:91262
Deposited By: George Porter
Deposited On:28 Nov 2018 23:54
Last Modified:16 Nov 2021 03:39

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