Carbon kinetic isotope effect in the reaction of CH4 with Cl atoms

The carbon kinetic isotope effect in the reaction between Cl and CH4 (KIECl) has been measured using tunable diode laser absorption spectroscopy to determine 13CH4/12CH4 ratios. Cl atoms were generated by the irradition of Cl2 in static mixtures of Cl2/CH4/N2 or Cl2/CH4/N2/O2. Both methods resulted...

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Bibliographic Details
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 Washington, DC Blackwell Publishing Ltd 15.05.1995
American Geophysical Union
Subjects
Atmospheric composition. Chemical and photochemical reactions
Earth, ocean, space
Exact sciences and technology
External geophysics
Physics of the high neutral atmosphere
Methane
Kinetic isotope effect
Laboratory study
Chemical reaction
Chlorine
Stratosphere
Chemical composition
Isotopic composition
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Summary:The carbon kinetic isotope effect in the reaction between Cl and CH4 (KIECl) has been measured using tunable diode laser absorption spectroscopy to determine 13CH4/12CH4 ratios. Cl atoms were generated by the irradition of Cl2 in static mixtures of Cl2/CH4/N2 or Cl2/CH4/N2/O2. Both methods resulted in a (KIECl) of 1.066±0.002 at 297 K. The KIECl 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 CH4 isotopic composition and may help to resolve discrepancies between measurements of stratospheric 13CH4/12CH4 profiles and laboratory measurements of KIEOH.
Bibliography:istex:14874E7B58D810B421D2ECD67644D1D3B367EC8B
ArticleID:95GL00881
ark:/67375/WNG-W07XJF24-J
ISSN:0094-8276
1944-8007
DOI:10.1029/95GL00881