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Optica Publishing Group
  • Applied Spectroscopy
  • Vol. 48,
  • Issue 12,
  • pp. 1457-1460
  • (1994)

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

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Abstract

Detection of monobasic, straight-chain saturated fatty acid (octadecanoic C18:0) in CCl<sub>4</sub>, based on the thermal lens effect after excitation by CO<sub>2</sub> laser radiation at 934.9 cm<sup>-1</sup> 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.

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