CARBON KINETIC ISOTOPE EFFECT IN THE REACTION OF CH4 WITH CL ATOMS

被引：103

作者：

SAUERESSIG, G ^{[1
]}

BERGAMASCHI, P ^{[1
]}

CROWLEY, JN ^{[1
]}

FISCHER, H ^{[1
]}

HARRIS, GW ^{[1
]}

机构：

[1] YORK UNIV,N YORK,ON M3J 1P3,CANADA

来源：

GEOPHYSICAL RESEARCH LETTERS | 1995年 / 22卷 / 10期

关键词：

D O I：

10.1029/95GL00881

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The carbon kinetic isotope effect in the reaction between Cl and CH4 (KIE(Cl)) has been measured using tunable diode laser absorption spectroscopy to determine (CH4)-C-13/(CH4)-C-12 ratios. Cl atoms were generated by the irradition of Cl-2 in static mixtures of Cl-2/CH4/N-2 or Cl-2/CH4/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 CH4 isotopic composition and may help to resolve discrepancies between measurements of stratospheric (CH4)-C-13/(CH4)-C-12 profiles and laboratory measurements of KIE(OH).

引用

页码：1225 / 1228

页数：4

共 16 条

[1] HIGH-PRECISION DIRECT MEASUREMENTS OF (CH4)-C-13/(CH4)-C-12 AND (CH3D)-C-12/(CH4)-C-12 RATIOS IN ATMOSPHERIC METHANE SOURCES BY MEANS OF A LONG-PATH TUNABLE DIODE-LASER ABSORPTION SPECTROMETER [J].