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

Saueressig G. | Zendy; Bergamaschi P. | Zendy; Crowley J. N. | Zendy; Fischer H. | Zendy; Harris G. W. | Zendy

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

Author(s) -

Saueressig G.,

Bergamaschi P.,

Crowley J. N.,

Fischer H.,

Harris G. W.

Publication year - 1995

Publication title -

geophysical research letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.007

H-Index - 273

eISSN - 1944-8007

pISSN - 0094-8276

DOI - 10.1029/95gl00881

Subject(s) - kinetic isotope effect , analytical chemistry (journal) , isotope , kinetic energy , carbon fibers , chemistry , spectroscopy , isotopes of carbon , materials science , deuterium , atomic physics , physics , environmental chemistry , composite number , quantum mechanics , composite material

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.

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