Relation between s-polarized and p-polarized internal reflection spectra: Application for the spectral resolution of perpendicular vibrational modes

Robin H A. Ras, Helsinki University of Technology
Robert A. Schoonheydt, Centrum voor Oppervlaktechemie en Katalyse
Cliff T. Johnston, Purdue University

Date of this Version


This document has been peer-reviewed.



DOI: 10.1021/jp073108a


The orientation of chemical bonds in thin films is commonly probed with polarized internal reflection Fourier transform infrared spectroscopy. Here we demonstrate how the internal reflection spectra obtained using s-polarized light are related with the corresponding p-polarized spectra. The relation between s- and p-polarized internal reflection spectra is applied to resolve the absorption bands of vibrational modes with components oriented perpendicular to the substrate. This is successfully demonstrated using Langmuir-Blodgett films containing smectite clay minerals and a surfactant deposited on ZnSe and Ge internal reflection elements.