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Optoacoustic Lead-Salt Diode Laser Detection of Trace Species in a Flow System

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Abstract:

An experimental setup for kinetic and product studies in a flow system has been developed. For detection, a nonresonant optoacoustic technique combined with a tunable lead-salt diode laser has been employed. The performance of the system was tested on ammonia in argon, and a detection limit (S/N = 2) of 8 × 1012 molecules cm-3 (corresponding to 320 ppb at atmospheric pressure) was obtained at a pressure of about 7 kPa when frequency modulation was employed. At 1.5 kPa the detection limit was about 2 × 1014 molecules cm-3. With a multipass cell the sensitivity was increased by a factor of four.

Keywords: Ammonia; Flow system; Infrared diode laser; Lead-salt diode laser; Optoacoustic detection; Photoacoustic detection

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702953964967

Affiliations: 1: Department of Physical Chemistry, University of Göteborg and Chalmers University of Technology, S-412 96 Göteborg, Sweden 2: Department of Inorganic Chemistry, University of Göteborg and Chalmers University of Technology, S-412 96 Göteborg, Sweden

Publication date: August 1, 1995

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