Carbon kinetic isotope effect in the reaction of CH 4 with Cl atoms

The carbon kinetic isotope effect in the reaction between Cl and CH 4 (KIE Cl ) has been measured using tunable diode laser absorption spectroscopy to determine 13 CH 4 / 12 CH 4 ratios. Cl atoms were generated by the irradition of Cl 2 in static mixtures of Cl 2 /CH 4 /N 2 or Cl 2 /CH 4 /N 2 /O 2 ....

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Published inGeophysical research letters Vol. 22; no. 10; pp. 1225 - 1228
Main Authors Saueressig, G., Bergamaschi, P., Crowley, J. N., Fischer, H., Harris, G. W.
Format Journal Article
LanguageEnglish
Published 15.05.1995
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Summary:The carbon kinetic isotope effect in the reaction between Cl and CH 4 (KIE Cl ) has been measured using tunable diode laser absorption spectroscopy to determine 13 CH 4 / 12 CH 4 ratios. Cl atoms were generated by the irradition of Cl 2 in static mixtures of Cl 2 /CH 4 /N 2 or Cl 2 /CH 4 /N 2 /O 2 . Both methods resulted in a (KIE Cl ) of 1.066±0.002 at 297 K. The KIE Cl displayed a slight temperature dependence, increasing to 1.075±0.005 at 223 K. This result suggests a significant influence of the title reaction on the stratospheric CH 4 isotopic composition and may help to resolve discrepancies between measurements of stratospheric 13 CH 4/ 12 CH 4 profiles and laboratory measurements of KIE OH.
ISSN:0094-8276
1944-8007
DOI:10.1029/95GL00881