Abstract

Attenuated Total Reflection infrared spectra were obtained for rough and spheroidal powders made from an amorphous polymer. The spectra were recorded with a polarizer to obtain both parallel and perpendicular components of the spectra separately. The results were compared to both theoretical predictions and experimental results for the same material examined as a film. It was found that the relative absorption intensities of the two polarization spectra recorded of the film agreed well with the theory for films. However, the powdered samples showed unexpected increases in absorption intensities for the perpendicular spectra. The intensities of the absorptions for perpendicular polarization were about 45% greater than for films as measured by the ratio of relative effective thicknesses. Implications for interpretation of the spectra of powdered materials are discussed.

Dispersion effects on infrared spectra in attenuated total reflection

Rabah Belali, Jean-Marie Vigoureux, and Joseph Morvan
J. Opt. Soc. Am. B 12(12) 2377-2381 (1995)

Refractive indices of powdered materials using attenuated total reflectance spectroscopy

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Attenuated total reflection method for obtaining the optical constants of powders

Ian R. Chandler, Vincent P. Tomaselli, and K. D. Moller
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Attenuated total reflection angular spectra of a system of alternating plasma-dielectric layers

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Moldable optical element: a new tool to obtain the infrared attenuated-total-reflection spectrum of a rough surface

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Appl. Opt. 34(22) 4989-4992 (1995)