Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 10, Issue 11, Pages 1540-1554Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b717386e
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The technique of pulsed laser photolysis coupled to LIF detection of IO was used to study reactions: (R1a) IO + NO3 -> OIO + NO2; (R2) I + NO3 -> (products); (R3) CH2I + O-2 (products); and (R4) O(P-3) + CH2I2 -> IO + CH2I, at ambient temperature. Reaction (R1) was observed for the first time in the laboratory and a rate coefficient of k(1) (a) = (9 +/- 4) x 10(-12) cm(3) molecule(-1) s(-1) obtained. For (R2), a value of k(2) (298 K) (1.0 +/- 0.3) x 10(-10) cm(3) molecule(-1) s(-1) was obtained, and a IO product yield close to unity determined. IO was also formed in a close-to-unity yield in reaction (R4), whereas in (R3) an upper limit of alpha(3)(IO) < 0.12 was derived. The implications of these results for the nighttime chemistry of the atmosphere were discussed. Box model calculations showed that efficient OIO formation in (R1a) was necessary to explain field observations of large OIO/IO ratios.
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