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. The radical terminating, termolecular reaction between OH and NO2 exerts great influence on the NOy∕NOx ratio and O3 formation in the atmosphere. Evaluation panels (IUPAC and NASA) recommend rate coefficients for this reaction that disagree by as much as a factor of 1.6 at low temperature and pressure. In this work, the title reaction was studied by pulsed laser photolysis and laser-induced fluorescence over the pressure range 16–1200 mbar and temperature range 217–333 K in N2 bath gas, with experiments at 295 K (67–333 mbar) for O2 . In situ measurement of NO2 using two optical absorption set-ups enabled generation of highly precise,accurate rate coefficients in the fall-off pressure range, appropriate foratmospheric conditions. We found, in agreement with previous work, that O2 bath gas has a lower collision efficiency than N2 with a relative collision efficiency to N2 of 0.74. Using the Troe-type formulation for termolecular reactions we present a new set of parameters with k0 ( N2 )  = 2.6 × 10 - 30  cm 6  molecule −2  s −1 , k0 ( O2 )  = 2.0 × 10 - 30  cm 6  molecule −2  s −1 , m=3.6 , k ∞ = 6.3 × 10 - 11  cm 3  molecule −1  s −1 , and Fc=0.39 and compare our results to previous studies in N2 and O2 bath gases.

atmospheric chemistry and physics

Kinetics of the OH + NO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; reaction: rate coefficients (217–333 K, 16–1200 mbar) and fall-off parameters for N&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; and O&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; bath gases