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Differential Thermal Lens Spectrometry in the Infrared
Author(s) -
Franko Mladen,
Bicanic Dane
Publication year - 1998
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1002/ijch.199800019
Subject(s) - chemistry , mass spectrometry , lens (geology) , detection limit , infrared , analytical chemistry (journal) , citric acid , signal (programming language) , excitation , thermal , chromatography , optics , organic chemistry , physics , electrical engineering , meteorology , computer science , programming language , engineering
The operational principle and the first application of a novel infrared differential thermal lens spectrometer for optical studies of liquid samples is described. Compared to a conventional double‐beam (pump/probe) configuration, the instrumental setup described here offers the possibility to substantially reduce (as much as 30 times) the background signal caused by the absorption of solvent, and hence to achieve improved limits of detection (LOD). Differential thermal lens spectrometry (TLS) with a CO laser as the excitation source was applied to detect tuberculostearic acid and the insecticide Carbaryl, both extracted into CCl 4 ; the corresponding LOD are 200 μg/L and 150 μg/L, respectively. Results of preliminary studies also suggest the potential use of differential TLS for detection of citric acid dissolved in water.