Rate constant for the reaction of the CFCl2 radical with oxygen in the pressure range 0.2–12 Torr at 298 K |
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Authors: | F Caralp R Lesclaux |
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Institution: | Laboratoire de Chimie-Physique A, Université de Bordeaux I, 33405 Talence, France |
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Abstract: | The rate constant for the reaction of CFCl2 with oxygen is measured in the pressure range 0.2–12 Torr using pulsed-laser photolysis and time-resolved mass spectrometry. CFCl2 radicals are generated by photolysis of CFCl3 at 193 nm. The reaction kinetics are recorded by monitoring the build-up of the CFCl2O2 radical concentration. The reaction is in its fall-off region, and the parameters of the relation for the treatment of the fall-off are for M = N2: k(0) = (5.0 ± 0.8) × 10?30 cm6 molecule?2 s?1. k(∞) = (6.0 ± 1.0) × 10?12 cm3 molecule?1 s?1. This value of k(∞) is consistent with results obtained at low pressure taking Fc = 0.6, but the uncertainty in the high-pressure limit is much higher. The results are compared to measurements performed with CH3 and CF3. Estimates of the relative third-body efficiencies of He and N2 are given for CFCl2 and CF3. |
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