Study of the pressure dependence of the rate constant of the reaction of NO3 with NO2

We have applied time resolved cavity ring-down spectroscopy to a kinetic study of the reaction of NO3 with NO2 in 20–700 Torr of N2 diluent at 298 and 283 K. By fitting the data to Troe’s expression with Fc = 0.6, the low-pressure and high-pressure limiting rate constants of this reaction were determined to be k 1 low (298 K) = (3.1 ± 0.8) × 10−30 cm6 molecule−2 s−1 and k 1 high (298 K) = (1.6 ± 0.3) × 10−12 cm3 molecule−1 s−1. These rate constants thus determined were 10–40% larger than those recommend in the NASA/JPL database.