Kinetics of the Reaction NO2 + NO3 + M at Low Preessures and 298 K

Article abstract of DOI:10.1021/j100254a024

A discharge flow-long path laser absorption apparatus has been utilized to measure absolute rate constants for the recombination reaction NO2 + NO3 + M -> N2O5 +M at 298 K over the pressure ranges of 0.5 - 6.0 torr of N2 and 1.0 - 8.0 torr of He.The title reaction is found to be in the falloff regime between third- and second-order kinetics over this pressure range.Falloff parameters were obtained by fitting the kinetic data to the falloff equation of Troe and co-workers.A fitted falloff expression of our data in conjunction with recently published rate coefficients for N2O5 decomposition was employed to calculate K_eq(298) and ΔH_f⁰(298) for NO3.