Sensitive detection of methane and nitrous oxide isotopomers using a continuous wave quantum cascade laser

Year: 2002

Authors: Gagliardi G., Tamassia F., De Natale P., Gmachl C., Capasso F., Sivco D.L., Baillargeon J.N., Hutchinson A.L. , Cho A.Y.

Autors Affiliation: Istituto Nazionale di Ottica Applicata, Largo E. Fermi 6, 50125 Firenze, Italy; European Laboratory for Non-Linear Spectroscopy and Istituto Nazionale per la Fisica della Materia , University of Firenze, Largo E. Fermi 2, 50125 Firenze, Italy; Bell Laboratories, Lucent Technologies, 600 Montain Avenue, Murray Hill, NJ 07974, USA

Abstract: A continuous wave quantum cascade laser (QCL), operating near 8.1 mum, was used for wavelength modulation spectroscopy of methane (CH4) and nitrous oxide (N2O) stable isotopes. Several rotational transitions of (N2O)-N-14-O-16, (NNO)-N-15-N-14-O-16, (N2O)-N-14-O-18, (N2O)-N-14-O-17, (CH4)-C-13 and (CH4)-C-12 fundamental bands were detected. The noise-equivalent absorbance was measured to be less than 10(-5) in a 1-Hz bandwidth. A characterization of the laser source was also performed. The use of a QCL spectrometer for high-precision isotope ratio measurements is discussed.


Volume: 19 (3)      Pages from: 327  to: 331

KeyWords: Difference-frequency-generation; Diode-laser; MU-M; Spectrometer; Linewidth; Ratios
DOI: 10.1140/epjd/e20020091

Citations: 36
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