title: Kinetic study of the reaction of OH with CH2I2.
abstract: Flash photolysis (FP) coupled to resonance fluorescence (RF) was used to measure the absolute rate coefficients (k(1)) for the reaction of OH(X(2)Π) radicals with diiodomethane (CH(2)I(2)) over the temperature range 295-374 K. The experiments involved time-resolved RF detection of the OH (A(2)Σ(+)→X(2)Π transition at λ = 308 nm) following FP of the H(2)O/CH(2)I(2)/He mixtures. The OH(X(2)Π) radicals were produced by FP of H(2)O in the vacuum-UV at wavelengths λ > 120 nm. Decays of OH radicals in the presence of CH(2)I(2) are observed to be exponential, and the decay rates are found to be linearly dependent on the CH(2)I(2) concentration. The results are described by the Arrhenius expression k(1)(T) = (4.2 ± 0.5) × 10(-11) exp[-(670 ± 20)K/T] cm(3) molecule(-1) s(-1). The implications of the reported kinetic results for understanding the atmospheric chemistry of CH(2)I(2) are discussed.
authors: Université Aix-Marseille 1, LCP, UMR 6264, 3 Place Victor Hugo, 13331 Marseille, France.
authors: Shaoliang
authors: S
authors: Zhang
authors: Rafal
authors: R
authors: Strekowski
authors: Loïc
authors: L
authors: Bosland
authors: Anne
authors: A
authors: Monod
authors: Cornelius
authors: C
authors: Zetzsch