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| - Atmospheric Chemistry of CH2BrCl: Kinetics and Mechanism of the Reaction of F Atomswith CH2BrCl and Fate of the CHBrClO• Radical
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| - The reaction of F atoms with CH2BrCl was studiedusing a pulsed radiolysis technique and found to proceedvia two channels: direct hydrogen abstraction and adduct formation.The adduct exists in equilibrium withF atoms and CH2BrCl. The equilibrium constantK4 =[Adduct]/([CH2BrCl][F]) = (4.2 ± 1.0)× 10-16cm3molecule-1. In 1000mbar total pressure of SF6 at 294 ± 2 K, the yield of theadduct is 68 ± 11% andthe overall rate constant for reaction of F atoms withCH2BrCl is k4 (1000 mbar) =(3.6 ± 0.9) × 10-11cm3molecule-1 s-1.The adduct reacts with NO with a rate constant of (2.09 ± 0.41)× 10-11 cm3molecule-1s-1. The atmospheric fate of the alkoxyradical CHBrClO is Br atom elimination, which occurs at arateestimated to be >2 × 106 s-1in 700 Torr of air at 295 K. Relative rate techniques were used tomeasurek(Cl + CH2BrCl) = (4.2 ± 0.5) ×10-13 and k(F +CH2BrCl → CHBrCl + HF) = (1.2 ± 0.4) ×10-11 cm3molecule-1 s-1.These results are compared to the available literaturedata.
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