Kinetics and mechanism of CH3Br,CHF2Br,and C2HF4Br photolysis in the presence of dioxygen under the action of λ = 253.7 nm light |
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| Authors: | I K Larin T I Belyakova N A Messineva A I Spasskii E M Trofimova |
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| Institution: | 1. Institute of Energy Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia
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| Abstract: | The photolysis of CH3Br, CHF2Br, and C2HF4Br mixed with oxygen under radiation emitted by a bactericidal mercury lamp (radiation intensity maximum at λ = 253.7 nm) has been investigated. Oxygen was added in order to simulate natural conditions. A photolysis mechanism has been suggested, the corresponding model calculations have been carried out, and the calculated data have been compared with experimental data. The calculated absorption cross sections are in agreement with the literature, thus proving the validity of the mechanism suggested. The ratios between the rate constants of the reactions of the photolytically generated CH3, CHF2, and C2HF4 radicals with molecular bromine and oxygen have been determined. |
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