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Absolute rate constants for the self reactions of HO2, CF3CFHO2, and CF3O2 radicals and the cross reactions of HO2 with FO2, HO2 with CF3CFHO2, and HO2 with CF3O2 at 295 K

✍ Scribed by Jens Sehested; Trine Møgelberg; Kjell Fagerström; Gharib Mahmoud; Timothy J. Wallington

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
175 KB
Volume
29
Category
Article
ISSN
0538-8066

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✦ Synopsis

The kinetics of the self-reactions of HO 2 , CF 3 CFHO 2 , and CF 3 O 2 radicals and the cross reactions of HO 2 with FO 2 , HO 2 with CF 3 CFHO 2 , and HO 2 with CF 3 O 2 radicals, were studied by pulse radiolysis combined with time resolved UV absorption spectroscopy at 295 K. The rate constants for these reactions were obtained by computer simulation of absorption transients monitored at 220, 230, and 240 nm. The following rate constants were obtained at 295 K and 1000 mbar total pressure of SF 6 (unit:

HO 2 ) ϭ 5.0 Ϯ 1.5, and k(CF 3 O 2 ϩ HO 2 ) ϭ 4.0 Ϯ 2.0. In addition, the decomposition rate of CF 3 CFHO radicals was estimated to be (0.2 -2) ϫ 10 3 s Ϫ1 in 1000 mbar of SF 6 . Results are discussed in the context of the atmospheric chemistry of hydrofluorocarbons.

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