Rate Constants for the Reactions of OH Radical with the (E)/(Z) Isomers of CF3CF═CHCl and CHF2CF═CHCl

The rate constants for the reactions of OH radical with (E)- and (Z)-isomers of CF3CF═CHCl and CHF2CF═CHCl have been measured over the temperature range of 250–430 K. Kinetic measurements have been performed using flash and laser photolysis methods combined with laser-induced fluorescence. Arrhenius rate constants have been determined as k((E)-CF3CF═CHCl) = (1.09 ± 0.03) × 10–12 · exp[(50 ± 10)K/T], k((Z)-CF3CF═CHCl) = (8.02 ± 0.19) × 10–13 · exp[−(100 ± 10)K/T], k((E)–CHF2CF═CHCl) = (1.50 ± 0.03) × 10–12 · exp[(160 ± 10)K/T], and k((Z)–CHF2CF═CHCl) = (1.36 ± 0.03) × 10–12 · exp[(360 ± 10)K/T] cm3 molecule–1 s–1. Infrared absorption spectra have also been measured at room temperature. The atmospheric lifetimes of (E)-CF3CF═CHCl, (Z)-CF3CF═CHCl, (E)-CHF2CF═CHCl, and (Z)-CHF2CF═CHCl have been estimated as 8.9, 20, 4.6, and 2.6 days, respectively, and their global warming potentials and ozone depletion potentials were determined as 0.23, 0.88, 0.060, and 0.016 and 0.00010, 0.00023, 0.000057, and 0.000030, re...