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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.