Rate constant for the reaction of OH radical with HFC‐365mfc (CF 3 CH 2 CF 2 CH 3 )

Rate constant for the reaction of OH with HFC‐365mfc (CF 3 CH 2 CF 2 CH 3 ) has been measured at a total pressure of 100 Torr, using the laser photolysis ‐ laser induced fluorescence technique. The obtained kinetic data were used to derive the following Arrhenius expression over the temperature range 269–370 K : k = (1.68±0.21) × 10 −12 exp[‐(1585±80)/T] cm³ molecule −1 s −1 . At 298 K, the measured rate coefficient was : k = (8.69±0.74) × 10 −15 cm³ molecule −1 s −1 . This study is the first investigation to be reported on this reaction. Using our kinetic data, the tropospheric lifetime of CF 3 CH 2 CF 2 CH 3 is estimated to be 7.8 years.