Dual-Beam Thermal Lens Measurement of Condensed-Phase Sample at CO2 Laser Wavelengths: Detection of Octadecanoic Acid in Carbon Tetrachloride

Authors: Franko, Mladen1; Bicanic, Dane2; Bozóki, Zoltáan3; Jalink, Henk4

Source: Applied Spectroscopy, Volume 48, Issue 12, Pages 1453-1564 (December 1994) , pp. 1457-1460(4)

Publisher: Society for Applied Spectroscopy

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Abstract:

Detection of monobasic, straight-chain saturated fatty acid (octadecanoic C18:0) in CCl4, based on the thermal lens effect after excitation by CO2 laser radiation at 934.9 cm-1 is described for the first time. The achieved limit of detection (LOD=0.3%) is comparable to that of the transmission infrared technique. Possibilities for further improvements in sensitivity and detection limit are also discussed.

Keywords: CO2 laser; Fatty acids; Octadecanoic acid; Thermal lensing; Trace detection

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702944027868

Affiliations: 1: "Jožef Stefan" Institute, Jamova 39, 61111 Ljubljana, Slovenia 2: Laser Photoacoustic Laboratory, Department of Agricultural Engineering and Physics, Agricultural University, Agrotechnion, Bomenweg 4, 6703 HD Wageningen, The Netherlands 3: Department of Photophysics, Institute of Isotopes, Hungarian Academy of Sciences, Budapest, Hungary 4: Centre for Plant Breeding and Reproduction Research, CPRO-DLO, P.O. Box 16, 6700 AA Wageningen, The Netherlands

Publication date: December 1, 1994

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