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Quality Evaluation of Polarization-Modulation Infrared Reflection–Absorption Spectra of a Langmuir Monolayer on Water Dependent on Angle of Incidence and Molecular Orientation

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Abstract:

Quality analysis of polarization-modulation infrared reflection–absorption spectrometry (PM-IRRAS) for measurements of a Langmuir (L) monolayer film on water is presented. The spectral quality represented by the signal-to-noise ratio is evaluated by taking into account both the band intensity and the electrical signal throughput led out from the Fourier transform infrared (FT-IR) spectrometer. The product of the two parameters, which is named the quality evaluation function, theoretically reveals the optimal angle of incidence for the L film measurements. In addition, the PM-IRRAS-specific surface selection rule with respect to the spectral quality is also presented.

Keywords: LANGMUIR MONOLAYER FILM; OPTIMAL ANGLE OF INCIDENCE; PM-IRRAS; POLARIZATION-MODULATION INFRARED REFLECTION–ABSORPTION SPECTROMETRY; QUALITY OF SPECTRA; SURFACE SELECTION RULES

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370210793561646

Affiliations: 1: Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan 2: Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan. hasegawa@chem.titech.ac.jp

Publication date: December 1, 2010

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