LIF studies of iodine oxide chemistry Part 3. Reactions IO + NO3 → OIO + NO2, I + NO3 → IO + NO2, and CH2I + O2 → (products): implications for the chemistry of the marine atmosphere at night

Literature Information

Publication Date 2008-01-30
DOI 10.1039/B717386E
Impact Factor 3.676
Authors

Terry J. Dillon, María E. Tucceri, Rolf Sander, John N. Crowley


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Abstract

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 + O2 → (products); and (R4) O(3P) + CH2I2 → IO + CH2I, at ambient temperature. Reaction (R1) was observed for the first time in the laboratory and a rate coefficient of k1 a = (9 ± 4) × 10−12 cm3 molecule−1 s−1 obtained. For (R2), a value of k2 (298 K) = (1.0 ± 0.3) × 10−10 cm3 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 α3(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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