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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.
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Itoh et al. (2010) studied this question.
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