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UV absorption spectrum of CF3CFClO2 and kinetics of the self reaction of CF3CFCl and CF3CFClO2 and the reactions of CF3CFClO2 with NO and NO2

✍ Scribed by Jens Sehested

Publisher: John Wiley and Sons
Year: 1994
Tongue: English
Weight: 976 KB
Volume: 26
Category: Article
ISSN: 0538-8066
DOI: 10.1002/kin.550261007

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✦ Synopsis

The ultraviolet absorption spectrum of CF3CFC102 and the kinetics of the self reactions of CF3CFC1 and CF3CFC102 radicals and the reactions of CFzCFC102 with NO and NO2 have been studied in the gas phase at 295 K by pulse radiolysis/transient UV absorption spectroscopy. The UV absorption cross section of CF3CFCl radicals was measured to be (1.78 t 0.22) X lo-'' cm2 molecule-' at 220nm. The UV spectrum of CF3CFC102 radicals was quantified from 220 nm to 290 nm. The absorption cross section at 250 nm was determined to be (1.67 5 0.21) X lo-'' cm2 molecule-'.

The rate constants for the self reactions of CF3CFCl and CF3CFC102 radicals were (2.6 2 0.4) X 10-l' cm3 molecule-' s-l and (2.6 2 0.5) X cm3 molecule-' s-', respectively. The reactivity of CF3CFC102 radicals towards NO and NO2 was determined to (1.5 2 0.6) X lo-'' cm3 molecule-' s-' and (5.9 5 0.5) X cm3 molecule-' s-l, respectively. Finally, the rate constant for the reaction of F atoms with CF3CFClH was determined to (8 t 2) X cm3 molecule-I s-'. Results are discussed in the context of the atmospheric chemistry of HCFC-124, CF3CFClH.

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