Experimental Optimization of p-Polarized MAIR Spectrometry Performed on a Fourier Transform Infrared Spectrometer

Abstract

Optimized experimental conditions of infrared p-polarized multiple-angle incidence resolution spectrometry (p-MAIRS) for the analysis of ultrathin films on glass have been explored. When the original MAIRS technique is employed for thinfilm analysis on a substrate of germanium or silicon, which exhibits a high refractive index, an established experimental condition without optimization can be adapted for the measurements. On the other hand, the p-MAIRS technique that has been developed for analysis on a low-refractive-index material requires, however, optimization of the experimental parameters for a 'quantitative' molecular orientation analysis. The optimization cannot be performed by considering only for optics in the spectrometer, but for optics concerning the substrate should also be considered. In the present study, an optimized condition for infrared p-MAIRS analysis on glass has been revealed, which can be used for quantitative molecular orientation analysis in ultrathin films on glass.

Proton Transport Property of Nafion Thin Films on MgO(100) with Anisotropic Molecular Structure

“…To investigate in-plane and out-of-plane molecular vibrations in an identical 400 nm thick film of Nafion on the MgO(100) substrate, an infrared p-polarized multipleangle incidence resolution spectrometry (p-MAIRS) technique, which had been developed by Hasegawa [8][9][10][11], was carried out. Infrared MAIRS and p-MAIRS are being recognized as powerful spectroscopic tools for revealing molecular orientation in thin films.…”

Comprehensive Understanding of Structure‐Controlling Factors of a Zinc Tetraphenylporphyrin Thin Film Using pMAIRS and GIXD Techniques

“…For this purpose, we first employedt he combined analytical technique of infrared p-polarized multiple-anglei ncidencer esolution spectrometry (pMAIRS) [33][34][35][36][37] andt he grazing incidence X-ray diffraction (GIXD) [38,39] technique. The combination of the techniques is quite powerful for revealing the correlation between the molecular orientation and crystal structurei nathin film:t he molecular orientation of each chemical group in the thin film is revealed quantitatively by using pMAIRS and GIXD providest he crystal structure (and/orc rystallinity).…”

A new schematic for poly(3-alkylthiophene) in an amorphous film studied using a novel structural index in infrared spectroscopy

“…To get over the difficulty, IR pMAIRS [34][35][36][37] that is a useful spectroscopic tool for revealing the molecular orientation in an organic thin film in a laboratory 38,39 is powerful, since IR pMAIRS works irrespective of the crystallinity of the thin film.…”

“…The number of accumulations of the interferogram was 1000 for each angle of incidence.IR pMAIRS yields both IP (in-plane) and OP (out-of-plane) spectra simultaneously from an identical sample, which correspond to the conventional transmission and reflection-absorption spectra, respectively. The molecular orientation can directly be analyzed by choosing the optimal angles of incidence,37 with which no knowledge of optical parameters is needed. The orientation angle, , is calculated by using the MAIRS dichroic ratio, IP OP I I , as follows.…”