PULSE-RADIOLYSIS STUDY OF CF3CCL2 AND CF3CCL2O2 RADICALS IN THE GAS-PHASE AT 295-K

The ultraviolet absorption spectra and self reaction kinetics of CF3CC l2 and CF3CCl2O2 radicals have been studied in the gas phase at 295K. Absorption cross sections were quantified over the wavelength range 22 0-300 nm. Measured cross sections near the absorption maxima were sigm a(CF3CCl2)(230 nm) = (9.70 +/- 1.47) x 10(-18) and sigma(CF3CCl2O2)(25 0 nm) = (1.70 +/- 0.26) x 10(-18) cm2 molecule-1. Errors are statistic al (2sigma) together with our estimate of potential systematic errors. Rate constants for the self reaction of CF3CCl2 and CF3CCl2O2 radical s were measured to be k6 = (2.46 +/- 0.43) x 10(-12) and k7obs = (3.33 +/- 0.53) x 10(-12) cm3 molecule-1 s-1, respectively. Results are dis cussed with respect to the existing database concerning halogenated pe roxy radicals.