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À propos de : Atmospheric Chemistry of the Z and E Isomers of CF3CFCHF; Kinetics, Mechanisms,and Products of Gas-Phase Reactions with Cl Atoms, OH Radicals, and O3        

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  • Atmospheric Chemistry of the Z and E Isomers of CF3CFCHF; Kinetics, Mechanisms,and Products of Gas-Phase Reactions with Cl Atoms, OH Radicals, and O3
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  • Smog chamber/FTIR techniques were used to study the atmospheric chemistry of the Z and E isomers ofCF3CFCHF, which we refer to as CF3CFCHF(Z) and CF3CFCHF(E). The rate constants k(Cl + CF3CFCHF(Z)) = (4.36 ± 0.48) × 10-11, k(OH + CF3CFCHF(Z)) = (1.22 ± 0.14) × 10-12, and k(O3 +CF3CFCHF(Z)) = (1.45 ± 0.15) × 10-21 cm3 molecule-1 s-1 were determined for the Z isomer of CF3CFCHF in 700 Torr air diluent at 296 ± 2 K. The rate constants k(Cl + CF3CFCHF(E)) = (5.00 ± 0.56)× 10-11, k(OH + CF3CFCHF(E)) = (2.15 ± 0.23) × 10-12, and k(O3 + CF3CFCHF(E)) = (1.98 ± 0.15)× 10-20 cm3 molecule-1 s-1 were determined for the E isomer of CF3CFCHF in 700 Torr air diluent at 296± 2 K. Both the Cl-atom and OH-radical-initiated atmospheric oxidation of CF3CFCHF give CF3C(O)Fand HC(O)F in molar yields indistinguishable from 100% for both the Z and E isomer. CF3CFCHF(Z) hasan atmospheric lifetime of approximately 18 days and a global warming potential (100 year time horizon) ofapproximately 6. CF3CFCHF(E) has an atmospheric lifetime of approximately 10 days and a global warmingpotential (100 year time horizon) of approximately 3. CF3CFCHF has a negligible global warming potentialand will not make any significant contribution to radiative forcing of climate change.
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