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Proceedings Paper

Polarization modulation FTIR spectroscopy of a spread monolayer at the air-water interface
Author(s): D. Blaudez; Thierry Buffeteau; J. C. Cornut; B. Desbat; N. Escafre; Michel Pezolet; J. M. Turlet
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Paper Abstract

This study devoted to FTIR spectroscopy of monolayers spread at the air/water interface is, to our knowledge, the first one presenting complete mid-infrared monolayer spectra devoid of strong water vapor absorptions. This has been possible by using the PM-IRRAS method combining polarization modulation with two channel simultaneous acquisition. Due to its differential character, the detected signal is not sensitive to the isotropic absorptions of the sample environment. From theoretical simulations and experiments, the best angle of incidence was found to be near 76 degree(s) for the detection of intrasurface as well as out of surface transition moments. Under these experimental conditions, the absorption bands of the monolayer appear upwards or downwards in the normalized difference (covered vs uncovered) PM-IRRAS spectra depending on the orientation (parallel or perpendicular) of their transition moments with respect to the interface.

Paper Details

Date Published: 31 January 1994
PDF: 2 pages
Proc. SPIE 2089, 9th International Conference on Fourier Transform Spectroscopy, (31 January 1994); doi: 10.1117/12.166641
Show Author Affiliations
D. Blaudez, Univ. Bordeaux I (France)
Thierry Buffeteau, Univ. Bordeaux I (France)
J. C. Cornut, Univ. Bordeaux I (France)
B. Desbat, Univ. Bordeaux I (France)
N. Escafre, Univ. Bordeaux I (France)
Michel Pezolet, Univ. Laval (Canada)
J. M. Turlet, Univ. Bordeaux I (France)

Published in SPIE Proceedings Vol. 2089:
9th International Conference on Fourier Transform Spectroscopy
John E. Bertie; Hal Wieser, Editor(s)

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