Kinetics of the reaction Cl + NO2 + M

The termolecular rate constant for the reaction Cl + NO2 + M has been measured over the temperature range 264 to 417 K and at pressure 1 to 7 torr in a discharge flow system using atomic chlorine resonance fluorescence at 140 nm to monitor the decay of Cl in an excess of NO2. The results are{article}{empty}{document}k₁^ He = 9.4 × 10- 31 (T300 )- 2.0 ± 0.05 cm⁶ s^ - 1{document} and {article}{empty}{document}k₁^ N2 = (14.8 ± 1.4) × 10- 31 cm⁶ s- 1{document} at 296 K where error limits represent one standard deviation. The systematic error of k1 measurements is estimated to be about 15%. Using a static photolysis system coupled with the FTIR spectrophotometer the branching ratio for the formation of the two possible isomers was found to be ClONO(⩾75%) and CINO2(⩽25%) in good agreement with previous measurements.