Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9605446 | Journal of Photochemistry and Photobiology A: Chemistry | 2005 | 8 Pages |
Abstract
The kinetics of the reaction of OH radicals with 2,4-pentanedione and 3-methyl-2,4-pentanedione have been investigated in the gas-phase using a pulsed laser photolysis-laser induced fluorescence (PLP-LIF) technique. Hydroxyl radicals were generated from the parent compounds following pulsed laser photolysis at 248 nm. The rate coefficients were also determined using a conventional relative rate method. Average values of the bimolecular rate coefficients of k(OH + CH3C(O)CHC(OH)CH3) = (8.78 ± 0.58) Ã 10â11, k(OH + CH3C(O)C(CH3)C(OH)CH3) = (6.06 ± 0.54) Ã 10â11 and k(OH + CH3C(O)CH(CH3)C(O)CH3) = (1.16 ± 0.09) Ã 10â11 cm3 (molecule s)â1 were determined at 298 ± 2 K. Rate coefficients for the reaction of OH radicals with allyl alcohol and methyl vinyl ketone were also determined at 298 ± 2 K using the PLP-LIF technique employing the photolysis of 2,4-pentanedione and 3-methyl-2,4-pentanedione as the OH radical sources respectively, k(OH + CH2CHCH2OH) = (4.60 ± 0.19) Ã 10â11 and k(OH + CH2CHC(O)CH3) = (1.86 ± 0.12) Ã 10â11 cm3 (molecule s)â1. The measured rate coefficients are used to derive tropospheric lifetimes for the compounds.
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Authors
Anne-Louise Holloway, Jack Treacy, Howard Sidebottom, Abdelwahid Mellouki, Veronique Daële, Georges Le Bras, Ian Barnes,