✦ LIBER ✦

UV absorption spectra and kinetics of the self reaction of CFCl2CH2O2 and CF2ClCH2O2 radicals in the gas phase at 298 K

✍ Scribed by Timothy J. Wallington; Ole J. Nielsen

Publisher: John Wiley and Sons
Year: 1991
Tongue: English
Weight: 694 KB
Volume: 23
Category: Article
ISSN: 0538-8066
DOI: 10.1002/kin.550230905

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✦ Synopsis

The ultraviolet absorption spectra of the peroxy radicals derived from hydrochlorofluorocarbons 141b and 142b, (CFClzCHZOz and CFzClCHz02, respectively), and the kinetics of their self reactions have been studied in the gas phase at 298 K using a pulse radiolysis technique. Absorption cross sections were quantified over the wavelength range 220-300 nm. Measured absorption cross sections at 250 nm were indistinguishable within the experimental uncertainties (~10%) and yield;

Errors represent the sum of statistical uncertainty and our estimate of potential systematic errors. Our absorption cross section data were then used to derive the observed self reaction rate constants for reactions (1) and (2), defined as

CFzCICHzOz + CFzClCHzOz --j products of klobs = (4.36 5 0.64) x lo-'' and k2,,bs = (4.13 -+ 0.58) x lo-'' cm3 molecule-' s-', quoted errors represent 2a. These results are discussed with respect to previous studies of the absorption spectra and kinetics of peroxy radicals

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