Stable isotopic analysis of atmospheric methane by infrared spectroscopy by use of diode laser difference-frequency generation

被引：10
|
作者：
Trudeau, Michael E.
Chen, Pin
Garcia, Guilherme de Andrade
Hollberg, Leo W.
Tans, Pieter P.
机构：
[1] NOAA, Earth Syst Res Lab, Hilo, HI 96720 USA
[2] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA
[3] Inst Nacl Metrol Normalizacao & Qualidade Ind, BR-25250020 Rio De Janeiro, Brazil
[4] Natl Inst Stand & Technol, Div Time & Frequency, Boulder, CO 80305 USA
[5] NOAA, Earth Syst Res Lab, Boulder, CO 80303 USA
来源：
APPLIED OPTICS | 2006年 / 45卷 / 17期
关键词：
D O I：
10.1364/AO.45.004136
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
An infrared absorption spectrometer has been constructed to measure the stable isotopic composition of atmospheric methane samples. The spectrometer employs periodically poled lithium niobate to generate 15 LW of tunable difference-frequency radiation from two near-infrared diode lasers that probe the nu(3) rotational-vibrational band of methane at 3.4 mu m. To enhance the signal, methane is extracted from 25 1 of air by use of a cryogenic chromatographic column and is expanded into the multipass cell for analysis. A measurement precision of 12 parts per thousand is demonstrated for both delta C-13 and delta D. (c) 2006 Optical Society of America.
引用
收藏
页码：4136 / 4141
页数：6
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