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Sensitive intracavity photoacoustic measurements with a CO2 waveguide laser
Authors:F J M Harren  F G C Bijnen  J Reuss  L A C J Voesenek  C W P M Blom
Institution:(1) Fysisch Laboratorium, Katholieke Universiteit Nijmegen, Toernooiveld, NL-6525 ED Nijmegen, The Netherlands;(2) Experimentele Plantkunde, Katholieke Universiteit Nijmegen, Toernooiveld, NL-6526 ED Nijmegen, The Netherlands
Abstract:A photoacoustic intracavity configuration is presented; a resonant photoacoustic cell excited in its first longitudinal mode is placed inside the cavity of a CO2 waveguide laser. Due to the high laser power and the sharp intracavity focus, saturation effects occur in the excitation and relaxation process of absorbing C2H4 molecules. A more optimal configuration is applied to measure the C2H4 emission of several Rumex species. A detection sensitivity of 6 ppt (parts per trillion) C2H4 is reached, equivalent to a minimal detectable absorption of 1.8×10–10 cm–1.
Keywords:07  60  43  85  42  60
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