Isotopic ratio measurement of methane in ambient air using mid-infrared cavity leak-out spectroscopy

We report on infrared laser spectroscopic measurements of the isotopic composition of methane (CH4, CH4) in natural air samples with a cavity ring-down technique. A CO overtone sideband laser is utilized to excite a high-finesse cavity which provides an effective optical absorption path length of 3....

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Veröffentlicht in:Applied physics. B, Lasers and optics Lasers and optics, 2001, Vol.72 (1), p.121-125
Hauptverfasser: DAHNKE, H, KLEINE, D, URBAN, W, HERING, P, MÜRTZ, M
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Sprache:eng
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Zusammenfassung:We report on infrared laser spectroscopic measurements of the isotopic composition of methane (CH4, CH4) in natural air samples with a cavity ring-down technique. A CO overtone sideband laser is utilized to excite a high-finesse cavity which provides an effective optical absorption path length of 3.6 km. We achieved a detection limit of 105 ppt methane in ambient air using an integration time of 20 s. This corresponds to a minimum detectable absorption of 1.9X10 /cm. Rapid determination of the C/Cisotopic ratio of methane in ambient air without sample preconcentration or gas processing is realized. The present system requires only few minutes for an isotopic ratio measurement with a precision of 11%o .
ISSN:0946-2171
1432-0649
DOI:10.1007/s003400000509