Reactions of CFCl studied by laser-induced fluorescence

Abstract

CFCl radicals were generated in a discharge-flow system by the reaction of atomic oxygen with CF₂CFCl. Their decay along the flow tube was monitored by fluorescence excited with 386 nm radiation from a dye laser pumped by an N₂ laser. Rate coefficients for reactions of CFCl were measured at temperatures between 298 and 358 K. The following values were obtained, in units of cm³ molecule^–1 s^–1: O, (2.9 ± 1.2)× 10^–12 at 298 K; CFCl, 1.3 × 10^–13 at 298 K; O₂, < 2.5 × 10^–16 at 333 K; NO, (1.38 ± 0.10)× 10^–15 at 333 K; NO₂, (2.85 ± 0.22)× 10^–15 at 333 K; Cl₂, (7.9 ± 0.3)× 10^–13 exp(–547 ± 10/T); Br₂, (9.6 ± 2.4)× 10^–13 exp(–943 ± 82/T); CF₂CFCl, < 10^–15 at 298 K.