UV absorption spectra, kinetics and mechanisms of the self-reaction of CHF2O2 radicals in the gas phase at 298 K
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The ultraviolet-absorption spectrum and the self-reaction of CHF2O2 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 σCHF2O2 (240 nm) = (2.66 ± 0.46) × 10-18 cm2 molecule-1. The absorption cross section data were used to derive the observed self-reaction rate constant for the reaction CHF2O2 + CHF2O2 → products, defined as d[R]/dt = 2k1obs[CHF2O2]2, k1obs = (5.0 ± 0.7) × 10-12 cm3 molecule-1 s-1 (± 2σ). 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.
Originalsprog | Engelsk |
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Tidsskrift | Chemical Physics Letters |
Vol/bind | 192 |
Udgave nummer | 1 |
Sider (fra-til) | 82-88 |
Antal sider | 7 |
ISSN | 0009-2614 |
DOI | |
Status | Udgivet - 24 apr. 1992 |
ID: 228196258