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Kinetic study of the reaction of OH with CH3I revisited

✍ Scribed by Shaoliang Zhang; Rafal S. Strekowski; Loïc Bosland; Anne Monod; Cornelius Zetzsch

Publisher
John Wiley and Sons
Year
2011
Tongue
English
Weight
303 KB
Volume
43
Category
Article
ISSN
0538-8066

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✦ Synopsis

A flash photolysis resonance fluorescence technique has been employed to investigate the kinetics and mechanism of the reaction of OH(X 2 ) radicals with CH 3 I over the temperature and pressure ranges 295-390 K and 82-303 Torr of He, respectively. The experiments involved time-resolved RF detection of the OH (A 2 + → X 2 transition at λ = 308 nm) following FP of H 2 O/CH 3 I/He mixtures. The OH(X 2 ) radicals were produced by FP of H 2 O in the vacuum-UV at wavelengths λ > 115 nm using a commercial Perkin-Elmer Xe flash lamp. Decays of OH in the presence of CH 3 I are observed to be exponential, and the decay rates are found to be linearly dependent on the CH 3 I concentration. The measured rate coefficients for the reaction of OH with CH 3 I are described by the Arrhenius expression k O H+C H3I = (4.1 ± 2.2) × 10 -12 exp [(-1240 ± 200)K/T] cm 3 molecule -1 s -1 . The implications of the reported kinetic results for understanding the CH 3 I chemistry of both atmospheric and nuclear industry interests are discussed.

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