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Issue 11, 2008
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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

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Abstract

The technique of pulsed laser photolysis coupled to LIF detection of IO was used to study reactions: (R1a) IO + NO3OIO + NO2; (R2) I + NO3 → (products); (R3) CH2I + O2 → (products); and (R4) O(3P) + CH2I2IO + 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.

Graphical abstract: 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

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Article information


Submitted
09 Nov 2007
Accepted
19 Dec 2007
First published
30 Jan 2008

Phys. Chem. Chem. Phys., 2008,10, 1540-1554
Article type
Paper

LIF studies of iodine oxide chemistry

T. J. Dillon, M. E. Tucceri, R. Sander and J. N. Crowley, Phys. Chem. Chem. Phys., 2008, 10, 1540
DOI: 10.1039/B717386E

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