UV absorption spectrum of CF₃CFClO₂ and kinetics of the self reaction of CF₃CFCl and CF₃CFClO₂ and the reactions of CF₃CFClO₂ with NO and NO₂

The ultraviolet absorption spectrum of CF₃CFClO₂ and the kinetics of the self reactions of CF₃CFCl and CF₃CFClO₂ radicals and the reactions of CF₃CFClO₂ with NO and NO₂ have been studied in the gas phase at 295 K by pulse radiolysis/transient UV absorption spectroscopy. The UV absorption cross section of CF₃CFCl radicals was measured to be (1.78 ± 0.22) × 10⁻¹⁸ cm2 molecule⁻¹ at 220 nm. The UV spectrum of CF₃CFClO₂ radicals was quantified from 220 nm to 290 nm. The absorption cross section at 250 nm was determined to be (1.67 ± 0.21) × 10⁻¹⁸ cm² molecule⁻¹. The rate constants for the self reactions of CF₃CFCl and CF₃CFClO₂ radicals were (2.6 ± 0.4) × 10⁻¹² cm3 molecule⁻¹ s⁻¹ and (2.6 ± 0.5) × 10⁻¹² cm³ molecule⁻¹ s⁻¹, respectively. The reactivity of CF₃CFClO₂ radicals towards NO and NO₂ was determined to (1.5 ± 0.6) × 10⁻¹¹ cm³ molecule⁻¹ s⁻¹ and (5.9 ± 0.5) × 10⁻¹² cm³ molecule⁻¹ s⁻¹, respectively. Finally, the rate constant for the reaction of F atoms with CF₃CFClH was determined to (8 ± 2) × 10⁻¹³ cm³ molecule⁻¹ s⁻¹. Results are discussed in the context of the atmospheric chemistry of HCFC‐124, CF₃CFClH.