A New Method for Performing Polarization Modulation Infrared Reflection-Adsorption Spectroscopy of Surfaces

Abstract

A new and relatively simple polarization modulation technique is presented and tested that enables the whole spectral range to be detected between 400 and 4000 cm⁻¹. This experiment is conventionally carried out using a photoelastic modulator that modulates incident plane polarized light through 90°. This suffers from the drawback that it enables spectra to be collected only over a relatively narrow spectral range. As an alternative, a polarizer is placed in the beam and oriented at 45° to the sample normal. This produces incident radiation fluxes with identical intensities for both s- and p-polarized light. A second polarizer is then modulated through 90° and the surface spectrum is then extracted in the usual manner from the difference between these signals, normalized to their sum. The method is demonstrated for a self-assembled monolayer of 11-mercapto-undecanoicacid (11-MUA) on gold on mica, and it is shown that, while the resulting spectra are extremely sensitive to optical alignment, the method yields spectra that are in excellent agreement with published data.

Keywords

Reflection-absorption infrared spectroscopy RAIRS: Infrared reflection-absorption spectroscopy IRRAS Polarization modulation infrared reflection-absorption spectroscopy PM-IRRAS Self-assembled monolayers SAMs

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