A kinetics study of the reaction of Cl with NO2

The third order rate coefficients for the addition reaction of Cl with NO2, Cl + NO2 + M → ClNO2 (ClONO) + M; k1, were measured to be k1(He) = (7.5 ± 1.1) × 10−31 cm6 molecule−2 s−1 and k1(N2) = (16.6 ± 3.0) × 10−31 cm6 molecule−2 s−1 at 298 K using the flash photolysis‐resonance fluorescence method. The pressure range of the study was 15 to 500 torr He and 19 to 200 torr N2. The temperature dependence of the third order rate coefficients were also measured between 240 and 350 K. The 298 K results are compared with those from previous low pressure studies.