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Effect of Pressure on Diffuse Reflectance Infrared Spectra of Compressed Powders

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The effect of compressing powdered samples on their diffuse reflectance infrared spectra is discussed. The scattering coefficient decreases with applied pressure, the magnitude of the increase being dependent on the nature of the sample. For pure powdered organic samples, such as caffeine, the increase in f(R) can be dramatic. By subjecting powdered samples to a pressure which is not enough to cause them to become transparent, the packing density becomes more uniform and band intensities become more reproducible. The relative intensity of neighboring bands in any region of the spectrum does not change appreciably with applied pressure.

Keywords: Diffuse reflectance; Infrared spectrometry; Powders; Pressure effects; Scattering coefficient

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702844554152

Affiliations: 1: Department of Chemistry, Ohio University, Athens, Ohio 45701 2: Department of Chemistry, University of California, Riverside, California 92521

Publication date: March 1, 1984

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