Open AccessEvanescent-Wave Spectroscopy on Bulk-Response Optode Membranes
Author(s) -
R. E. Dohner,
Ursula E. Spichiger,
W. Simon
Publication year - 1992
Publication title -
chimia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.387
H-Index - 55
eISSN - 2673-2424
pISSN - 0009-4293
DOI - 10.2533/chimia.1992.215
Subject(s) - optode , absorbance , membrane , total internal reflection , attenuated total reflection , reflection (computer programming) , materials science , sapphire , optics , spectroscopy , solvent , analytical chemistry (journal) , chemistry , optoelectronics , chromatography , laser , infrared , physics , biochemistry , organic chemistry , quantum mechanics , computer science , programming language
The absorbance of a solvent polymerie bulk optode membrane in contact with sapphire as a wave-guide is studied with the attenuated total reflection (ATR) technique. Utilizing thin (≤ 1 μm) and, therefore, fast-responding membranes, high values of absorbance are obtained by multiple internal reflection (MIR). The approach has an advantage over conventional transmission studies in that the light beam does not pass through the sample solution. Samp1e-induced swelling of the membrane may, however, create problems.