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

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5 Author(s)
Ngai, Anthony K.Y. ; Life Science Trace Gas Facility, Molecular and Laser Physics, Institute for Molecules and Materials, Radboud University, P.O. Box 9010, NL-6500 GL Nijmegen, The Netherlands ; Persijn, Stefan T. ; Harren, Frans J.M. ; Verbraak, Harald
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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 μm; power: 1 W) sampling a supersonic planar jet expansion (nozzle dimension: 3 cm×80 μm). 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).

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Applied Physics Letters  (Volume:90 ,  Issue: 8 )