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

页码：4136 / 4141

页数：6

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