title: Quality evaluation of polarization-modulation infrared reflection-absorption spectra of a Langmuir monolayer on water dependent on angle of incidence and molecular orientation.
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.
authors.affiliation: Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan.
authors.forename: Yuki
authors.initials: Y
authors.lastname: Itoh
authors.forename: Maiko
authors.initials: M
authors.lastname: Muro
authors.forename: Takeshi
authors.initials: T
authors.lastname: Hasegawa