Re-evaluation of the reaction rate coefficient of CH3Br + OH with implications for the atmospheric budget of methyl bromide

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Re-evaluation of the reaction rate coefficient of CH3Br + OH with implications for the atmospheric budget of methyl bromide. / Heimdal Nilsson, Elna; Joelsson, L. M. T.; Heimdal, J.; Johnson, M. S.; Nielsen, O. J.

I: Atmospheric Environment, Vol. 80, 2013, s. 70-74.

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

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T1 - Re-evaluation of the reaction rate coefficient of CH3Br + OH with implications for the atmospheric budget of methyl bromide

AU - Heimdal Nilsson, Elna

AU - Joelsson, L. M. T.

AU - Heimdal, J.

AU - Johnson, M. S.

AU - Nielsen, O. J.

PY - 2013

Y1 - 2013

N2 - The reaction rate coefficient k(CH3Br + OH) has been determined in the temperature range 298-373 K, using pulse radiolysis/UV kinetic spectroscopy, and at 298 K using a relative rate method. The Arrhenius expression obtained from a fit to the experimental results is (2.9 +/- 0.9) x 10(-12) exp(-(1230 +/- 125)/T) cm(3) molecule(-1) s(-1), which is greater than the expression currently recommended. The relative rate experiments give k(298 K) = (4.13 +/- 0.63) x 10(-14) cm(3) molecule(-1) s(-1). The results of the absolute and relative rate experiments indicate that the source budget of atmospheric CH3Br should be reinvestigated, as was recently done for CH3Cl. (C) 2013 Elsevier Ltd. All rights reserved.

AB - The reaction rate coefficient k(CH3Br + OH) has been determined in the temperature range 298-373 K, using pulse radiolysis/UV kinetic spectroscopy, and at 298 K using a relative rate method. The Arrhenius expression obtained from a fit to the experimental results is (2.9 +/- 0.9) x 10(-12) exp(-(1230 +/- 125)/T) cm(3) molecule(-1) s(-1), which is greater than the expression currently recommended. The relative rate experiments give k(298 K) = (4.13 +/- 0.63) x 10(-14) cm(3) molecule(-1) s(-1). The results of the absolute and relative rate experiments indicate that the source budget of atmospheric CH3Br should be reinvestigated, as was recently done for CH3Cl. (C) 2013 Elsevier Ltd. All rights reserved.

KW - Methyl bromide

KW - Atmospheric chemistry

KW - Reaction kinetics

U2 - 10.1016/j.atmosenv.2013.07.046

DO - 10.1016/j.atmosenv.2013.07.046

M3 - Article

VL - 80

SP - 70

EP - 74

JO - Atmospheric Environment

JF - Atmospheric Environment

SN - 1352-2310

ER -