Reaction rate constants of HO2+O3 in the temperature range 233–400 K

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Abstract
The reaction rate constants of HO2+O3 were measured as a function of temperature. HO2 was produced by the reaction sequence: Cl+CH3OH→CH2OH+HCl and CH2OH+O2→HO2+CH2O. HO2 was detected by the OH(A–X) fluorescence produced by photoexcitation of HO2 at 147 nm. The reaction rate constants are represented by k(T)=(1.8±0.6)×10−14 exp[−(680±148)/T] cm3/s in 253–400 K, and are nearly a constant of (1.3±0.3)×10−15 cm3/s in 233–253 K.