Atmospheric chemistry of CF 3 CN: kinetics and products of reaction with OH radicals, Cl atoms and O 3 .

Long path length FTIR-smog chamber techniques were used to study the title reactions in 700 Torr of N 2 , oxygen or air diluent at 296 ± 2 K. Values of k (Cl + CF 3 CN) = (2.43 ± 0.33) × 10 -15 and k (OH + CF 3 CN) = (4.61 ± 0.34) × 10 -15 cm 3 molecule -1 s -1 were measured. There was no discernible reaction of CF 3 CN with O 3 and an upper limit of k (O 3 + CF 3 CN) ≤ 7.9 × 10 -24 cm 3 molecule -1 s -1 was established. The IR spectra of CF 3 CN and CF 3 CF 2 CN are reported. The atmospheric lifetime of CF 3 CN is determined by the reaction with OH and is approximately 6.9 years. Reaction of CF 3 CN with Cl atoms in a chamber study gives ( Z -) and/or ( E -) CF 3 CClNCl and CF 3 C(O)Cl as major primary products. Under environmental conditions, the OH radical initiated oxidation gives COF 2 in a yield of (96 ± 8)%. The global warming potential for CF 3 CN is estimated as 1030 for a 100 year time horizon.