Selective trace gas detection of complex molecules with a continuous wave optical parametric oscillator using a planar jet expansion

The authors present a trace gas detection method for complex molecules using continuous cavity ring-down spectroscopy in combination with a continuous wave optical parametric oscillator (tunability wavelength: 2.8 - 4.8 μ m ; power: 1 W ) sampling a supersonic planar jet expansion (nozzle dimension:...

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Bibliographic Details
Published in:Applied physics letters 2007-02, Vol.90 (8), p.081109-081109-3
Main Authors: Ngai, Anthony K. Y., Persijn, Stefan T., Harren, Frans J. M., Verbraak, Harald, Linnartz, Harold
Format: Article
Language:English
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Summary:The authors present a trace gas detection method for complex molecules using continuous cavity ring-down spectroscopy in combination with a continuous wave optical parametric oscillator (tunability wavelength: 2.8 - 4.8 μ m ; power: 1 W ) sampling a supersonic planar jet expansion (nozzle dimension: 3 cm × 80 μ m ). The improved molecular selectivity allows simultaneous detection of larger numbers of complex molecules. With a total optical path length of 180 m in the planar jet, a detection limit for methanol in an air expansion was determined at 70 ppbv , corresponding to a minimal detectable absorption of 2.2 × 10 − 8 cm − 1 (over 90 s ).
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2709515