A pulse radiolysis technique was used to investigate the UV absorption spectrum of CF₃CHO₂^•CF₃ over the wavelength range 220-290 nm. At 250 nm the absorption cross section for CF₃CHO₂^•CF₃ was σ = (186 ± 27) × 10^-20 cm³ molecule^-1. The rate constant for the self-reaction rate of CF₃CHO₂^•CF₃ was determined to be (5.6 ± 0.7) × 10^-12 cm³ molecule^-1 s^-1. By following the increase in NO₂ at 400 nm, the rate constant for the reaction of CF₃CHO₂^•CF₃ with NO was found to be (1.1 ± 0.3) × 10^-11 cm³ molecule^-1 s^-1. The reaction of CF₃CHO₂^•CF₃ with NO gives CF₃CHO^•CF₃. A Fourier transform infrared technique was used to show that in the atmosphere >99% of CF₃CHO^•CF₃ react with O₂ to give CF₃COCF₃. The atmospheric fate of CF₃COCF₃ is photolysis or incorporation into rain-cloud-sea water followed by rapid hydrolysis. As part of the present work relative rate techniques were used to measure rate constants at 295 ± 2 K for the reactions of Cl and F atoms with CF₃CH₂CF₃ of <8 × 10^-17 and (1.8 ± 0.4) × 10^-13 cm³ molecule^-1 s^-1, respectively. In addition, the rate constant for reaction of F atoms with (CF₃)₂CHOH was determined to be (3.5 ± 1.1) × 10^-12 cm³ molecule^-1 s^-1. All experiments were performed at 296 ± 2 K.