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Reactions of ClOO with NO were studied by the photolysis of Cl2 in the presence of NO and O2 with or without added N2 using steady state photolysis. ClOO is formed by the reversible reaction The results indicate that ClOO reacts with NO via two channels: The atmospherically important values k2aK1,−1 = (1.5 ± 0.6) × 10−32 cm6 s−1 and k2bK1,−1 = (1.6 ± 1.0) × 10−31 cm6 s−1 were evaluated at 298°K based on the value of (1.1 ± 0.3) × 10−31 cm6 s −1 for the reaction The ratio k2b/k2a was found to be 11.0 ± 2.2. The values of k2aK1,−1 and k2bK1,−1 obtained in the present work when combined with a reasonable value of K1,−1 at stratospheric temperatures indicates that reactions 2a and 2b are probably not important in the stratosphere.

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