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
Measurements of the UV absorption cross sections of CF3CCl2O2, CF3CHFO2, CFCl2CH2O2 and CF2ClCH2O2 in the gas phase
โ Scribed by A.A. Jemi-Alade; P.D. Lightfoot; R. Lesclaux
- Publisher
- Elsevier Science
- Year
- 1991
- Tongue
- English
- Weight
- 525 KB
- Volume
- 179
- Category
- Article
- ISSN
- 0009-2614
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โฆ Synopsis
The absolute UV absorption cross sections of CF3CC1202, CFJCHF02, CFC12CH202, and CFZCICH20, have been measured in the gas phase at 298 K in the range 200-290 nm using the flash-photolysis technique. CF,COCl has been identified as a product in the system involving the self-reaction of CF$C1202.
๐ SIMILAR VOLUMES
Flash photolysis/time-resolved UV absorption measurements of the rate constants for the title reactions are reported over the temperature range 2 lo-253 K. The photolysis of F2/CF,H/03/02/N, gas mixtures reveals that the formation of CF302 and CF,O radicals has no measurable effect on the ozone conc
A relative rate approach has , been used to measure the reactivity of CF,O radicals towards ozone. Using k(CFaO+NOa)=2,7x IO-" cm' molecule-' s-' as the referencereactioqanupperlimit ofk(CF,O+Os) 63~ 10-'4cmSmolecule-' was determined at 295 K and 700 Torr of O2 diluent. The implications for the atmo
Rate constant ratios, k d /k c , for the disproportionation/combination reaction at a temperature of 295 ฯฎ 2 K, have been measured as 0.034 ฯฎ 0.009 for the collision between CF 3 CH 2 CF 2 ฯฉ CF 3 radicals and as 0.075 ฯฎ 0.019 for CF 3 CH 2 CF 2 ฯฉ CF 3 CH 2 CF 2 radicals. The effect of the two fluori
A variety of relative and absolute techniques have been used to measure the reactivity of fluorine atoms with a series of halogenated organic compounds and CO. The following rate constants were derived, in units of cm3 molecule-' s-l: CH3F, (3.7 2 0.8) X CH3C1, (3.3 2 0.71 X 10 -'I; CH3Br, (3.0 2 0.
Haloacetyl peroxynitrates are intermediates in the atmospheric degradation of a number of haloethanes. In this work, thermal decomposition rate constants of CF3C(0)02N02, CClFzC(0)02N02, CC12FC(0)02N02, and CC13C(0)02N02 have been determined in a temperature controlled 420 1 reaction chamber. Peroxy