Issue 44, 2006

Laser induced fluorescence studies of iodine oxide chemistry

Part II. The reactions of IO with CH3O2, CF3O2 and O3

Abstract

The technique of pulsed laser photolysis was coupled to laser induced fluorescence detection of iodine oxide (IO) to measure rate coefficients, k for the reactions IO + CH3O2 → products (R1, 30–318 Torr N2), IO + CF3O2 → products (R2, 70–80 Torr N2), and IO + O3 → OIO + O2 (R3a). Values of k1 = (2 ± 1) × 10−12 cm3 molecule−1 s−1, k2 = (3.6 ± 0.8) × 10−11 cm3 molecule−1 s−1, and k3a <5 × 10−16 cm3 molecule−1 s−1 were obtained at T = 298 K. In the course of this work, the product yield of IO from the reaction of CH3O2 with I was determined to be close to zero, whereas CH3OOI was formed efficiently at 70 Torr N2. Similarly, no evidence was found for IO formation in the CF3O2 + I reaction. An estimate of the rate coefficients k(CH3O2 + I) = 2 × 10−11 cm3 molecule−1 s−1 and k(CH3OOI + I) = 1.5 × 10−10 cm3 molecule−1 s−1 was also obtained. The results on k1k3 are compared to the limited number of previous investigations and the implications for the chemistry of the marine boundary layer are briefly discussed.

Graphical abstract: Laser induced fluorescence studies of iodine oxide chemistry Part II. The reactions of IO with CH3O2, CF3O2 and O3

Article information

Article type
Paper
Submitted
02 Aug 2006
Accepted
05 Oct 2006
First published
20 Oct 2006

Phys. Chem. Chem. Phys., 2006,8, 5185-5198

Laser induced fluorescence studies of iodine oxide chemistry

T. J. Dillon, M. E. Tucceri and J. N. Crowley, Phys. Chem. Chem. Phys., 2006, 8, 5185 DOI: 10.1039/B611116E

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