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dc.contributor.authorSaueressig, G.
dc.contributor.authorBergamaschi, P.
dc.contributor.authorCrowley, J.
dc.contributor.authorFischer, H.
dc.contributor.authorHarris, G.W.
dc.identifier.citationGeophys. Res. Letts., 23, 3619-3622en
dc.description.abstractThe D/H kinetic isotope effect (KIECl D) in the reaction of CH4 with Cl has been investigated using a tunable diode laser absorption spectrometer (TDLAS) to measure 12CH3D/12CH4 ratios. A KIECl D of 1.508±0.041 was obtained at room temperature (296 K). Experiments employing Fourier transform infrared measurements of 12CH3D/12CH4 ratios confirmed this result. An investigation of the temperature dependence showed an increase of KIECl D (1.592±0.057 at 223 K) with decreasing temperature. This very large D/H fractionation effect affects the overall isotope fractionation in the middle and upper stratosphere, where Cl contributes substantially to the total removal of CH4.en
dc.titleD/H kinetic isotope effect in the reaction CH4 + Clen

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