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

✍ Scribed by James B. Burkholder; Abdelwahid Mellouki; Ranajit Talukdar; A. R. Ravishankara

Publisher
John Wiley and Sons
Year
1992
Tongue
English
Weight
909 KB
Volume
24
Category
Article
ISSN
0538-8066

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✦ Synopsis

Rate coefficients, k l , for the reaction OH + HONO 4 H20 + NOz, have been measured over the temperature range 298 to 373 K. The OH radicals were produced by 266 nm laser photolysis of 0 3 in the presence of a large excess of HtO 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 kl = (2.8 ? 1.3) X lo-'' exp((260 2 140)/T) cm3 molecule-' s-'. The measured values of k l are compared with previous determinations and the atmospheric implications of our findings are discussed.

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