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Rate coefficients for the reaction of OH with HONO between 298 and 373 K
Author(s) -
Burkholder James B.,
Mellouki Abdelwahid,
Talukdar Ranajit,
Ravishankara A. R.
Publication year - 1992
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.550240805
Subject(s) - chemistry , photodissociation , radical , analytical chemistry (journal) , negative temperature , laser , atmospheric temperature range , photochemistry , thermodynamics , organic chemistry , physics , optics
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.