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UV absorption spectra, kinetics and mechanisms of the self-reaction of CHF2O2 radicals in the gas phase at 298 K

✍ Scribed by Ole J. Nielsen; Thomas Ellermann; Elzbieta Bartkiewicz; Timothy J. Wallington; Michael D. Hurley

Publisher: Elsevier Science
Year: 1992
Tongue: English
Weight: 621 KB
Volume: 192
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(92)85432-a

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✦ Synopsis

The ultraviolet-absorption spectrum and the self-reaction of CHF202 radicals have been studied in the gas phase at 298 K using the pulse radiolysis technique and long-pathlength Fourier transform infrared spectroscopy. Absorption cross sections were quantified over the wavelength range 220-280 nm. The measured cross section near the absorption maximum was ucHFIOl (240 nm) = ( 2.66 kO.46) x IO-'* cm* molecule-'. The absorption cross section data were used to derive the observed self-reaction rate constant for the reaction CHF202+CHF,02-+products, defined as d[ R] /dt=2k,obs[CHFZOZ]2, klob,= (5.OkO.7) x lo-'* cm3 molecule-' s-r ( k 20). The only carbon-containing product observed by FTIR spectroscopy was FC(O)F. These results are discussed with respect to previous studies of peroxy radicals,

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