Rate coefficients for the reaction of OH with HONO between 298 and 373 K

Rate coefficients, k 1 , for the reaction OH + HONO → H 2 O + NO 2 , have been measured over the temperature range 298 to 373 K. The OH radicals were produced by 266 nm laser photolysis of O 3 in the presence of a large excess of H 2 O vapor. The temporal profiles of OH were measured under pseudo‐first‐order conditions, in an excess of HONO, using time resolved laser induced fluorescence. The measured rate coefficient exhibits a slight negative temperature dependence, with k 1 = (2.8 ± 1.3) × 10 −12 exp((260 ± 140)/T) cm 3 molecule −1 s −1 . The measured values of k 1 are compared with previous determinations and the atmospheric implications of our findings are discussed.