A study of the reaction NO3 + NO2 + M → N2O5 + M(M = N2, O2)

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Abstract
The gas‐phase reaction of the NO3 radical with NO2 was investigated, using a flash photolysis‐visible absorption technique, over the total pressure range 25–400 Torr of nitrogen or oxygen diluent at 298 ± 2 K. The absolute rate constants determined (in units of 10−13 cm3 molecule−1 s−1) at 25, 100, and 400 Torr total pressure were, respectively, (4.0 ± 0.5), (7.0 ± 0.7), and (10 ± 2) for M = N2 and (4.5 ± 0.5), (8.0 ± 0.4), and (8.8 ± 2.0) for M = O2. These data show that the third‐body efficiencies of N2 and O2 are identical, within the error limits, and that previous evaluations for M = N2 are applicable to the atmosphere. In addition, upper limits were determined for the rate constants of the reactions of the NO3 radical with methanol, ethanol, and propan‐2‐ol of ⩽6 × 10−16, ⩽9 × 10−16, and ⩽2.3 × 10−15 cm3 molecule−1 s−1, respectively, at 298 ± 2 K.

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