Direct Rate Constant Measurements for the Reaction O + NO + Ar -> NO2 + Ar at 300-1341 K

Article abstract of DOI:10.1021/j100175a065

Rate constants for the title reaction were measured by two independent techniques: flash photolysis-resonance fluorescence 300-1001 K, and flash photolysis-shock tube, 915-1341 K.In all cases, low-pressure-limit conditions prevailed.The data are well fitted, over the entire experimental temperature span (300-1341 K), by the expression k₁⁰(M = Ar) = (6.7 +/- 0.1)*10^-32(T/300)^{-1.42 +/- 0.02} cm⁶ molecule^-2 s^-1.The present values, which fill in a gap in experimental measurements from 500 to 1450 K, are compared to those of previous studies and evaluations.Also, the strong collision, low-pressure rate constant (k₁^0,SC) and the collisional efficiency factor (β_c) are calculated over the temperature range 300-2000 K, and β_c is compared with previously reported results.