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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editor: Gregory W. Faris
  • Vol. 1, Iss. 7 — Jul. 17, 2006

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

Michael E. Trudeau, Pin Chen, Guilherme de Andrade Garcia, Leo W. Hollberg, and Pieter P. Tans  »View Author Affiliations

Applied Optics, Vol. 45, Issue 17, pp. 4136-4141 (2006)

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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   μW of tunable difference-frequency radiation from two near-infrared diode lasers that probe the ν3 rotational–vibrational band of methane at 3.4   μm . To enhance the signal, methane is extracted from 25 l of air by use of a cryogenic chromatographic column and is expanded into the multipass cell for analysis. A measurement precision of 12 is demonstrated for both δ 13 C and δD.

© 2006 Optical Society of America

OCIS Codes
(010.1280) Atmospheric and oceanic optics : Atmospheric composition
(300.6420) Spectroscopy : Spectroscopy, nonlinear

Original Manuscript: October 14, 2005
Revised Manuscript: January 25, 2006
Manuscript Accepted: January 26, 2006

Virtual Issues
Vol. 1, Iss. 7 Virtual Journal for Biomedical Optics

Michael E. Trudeau, Pin Chen, Guilherme de Andrade Garcia, Leo W. Hollberg, and Pieter P. Tans, "Stable isotopic analysis of atmospheric methane by infrared spectroscopy by use of diode laser difference-frequency generation," Appl. Opt. 45, 4136-4141 (2006)

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