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PUBLICATIONS

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

Published

Author(s)

M. E. Trudeau, Pin Chen, G de Andreade Garcia, Leo W. Hollberg, P P. Tans

Abstract

An infrared absorption spectrometer has been constructed to measure the stable isotopic composition of atmospheric methane samples. The spectrometer employs periodically poled lithium niobate (PPLN) to generate 15 W of tunable difference frequency radiation from two near infrared diode lasers that probes the 3 rotational-vibrational band of methane at 3.4 microns. To enhance the signal, methane is extracted from 25 L of air using a cryogenic chromatographic column and is expanded into the multipass cell for analysis. A measurement precision of 12? is demonstrated for both ?13C and ?D.
Citation
Applied Optics
Volume
45
Issue
17
Pub Type
Journals

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Keywords

air, difference frequency generation, infrared, isotopes, methane, periodically poled lithium niobate, spectroscopy

Citation

Trudeau, M. , Chen, P. , de, G. , Hollberg, L. and Tans, P. (2006), Stable isotopic analysis of atmospheric methane by infrared spectroscopy by use of diode laser difference-frequency generation, Applied Optics, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=50190 (Accessed May 9, 2025)

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If you have any questions about this publication or are having problems accessing it, please contact reflib@nist.gov.

Created June 10, 2006, Updated February 17, 2017