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Issue 24, 2011
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Kinetic study of the reaction of OH with CH2I2

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Abstract

Flash photolysis (FP) coupled to resonance fluorescence (RF) was used to measure the absolute rate coefficients (k1) for the reaction of OH(X2Π) radicals with diiodomethane (CH2I2) over the temperature range 295–374 K. The experiments involved time-resolved RF detection of the OH (A2Σ+X2Π transition at λ = 308 nm) following FP of the H2O/CH2I2/He mixtures. The OH(X2Π) radicals were produced by FP of H2O in the vacuum-UV at wavelengths λ > 120 nm. Decays of OH radicals in the presence of CH2I2 are observed to be exponential, and the decay rates are found to be linearly dependent on the CH2I2 concentration. The results are described by the Arrhenius expression k1(T) = (4.2 ± 0.5) × 10−11 exp[−(670 ± 20)K/T] cm3 molecule−1 s−1. The implications of the reported kinetic results for understanding the atmospheric chemistry of CH2I2 are discussed.

Graphical abstract: Kinetic study of the reaction of OH with CH2I2

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Publication details

The article was received on 23 Mar 2011, accepted on 12 Apr 2011 and first published on 18 May 2011


Article type: Paper
DOI: 10.1039/C1CP20885C
Citation: Phys. Chem. Chem. Phys., 2011,13, 11671-11677
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    Kinetic study of the reaction of OH with CH2I2

    S. Zhang, R. Strekowski, L. Bosland, A. Monod and C. Zetzsch, Phys. Chem. Chem. Phys., 2011, 13, 11671
    DOI: 10.1039/C1CP20885C

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