Selective trace gas detection of complex molecules with a continuous wave optical parametric oscillator using a planar jet expansion
Publication year
2007Source
Applied Physics Letters, 90, 8, (2007), pp. 081109-1/3ISSN
Publication type
Article / Letter to editor

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Organization
Molecular and Laser Physics
Journal title
Applied Physics Letters
Volume
vol. 90
Issue
iss. 8
Page start
p. 081109
Page end
p. 1/3
Subject
Molecular and Laser PhysicsAbstract
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 mu m; power: 1 W) sampling a supersonic planar jet expansion (nozzle dimension: 3 cmx80 mu 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 2.2x10(-8) cm(-1) (over 90 s). (c) 2007 American Institute of Physics.
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