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Proceedings Paper

Effects of sample preparation on the infrared reflectance spectra of powders
Author(s): Carolyn S. Brauer; Timothy J. Johnson; Tanya L. Myers; Yin-Fong Su; Thomas A. Blake; Brenda M. Forland
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Paper Abstract

While reflectance spectroscopy is a useful tool for identifying molecular compounds, laboratory measurement of solid (particularly powder) samples often is confounded by sample preparation methods. For example, both the packing density and surface roughness can have an effect on the quantitative reflectance spectra of powdered samples. Recent efforts in our group have focused on developing standard methods for measuring reflectance spectra that accounts for sample preparation, as well as other factors such as particle size and provenance. In this work, the effect of preparation method on sample reflectivity was investigated by measuring the directional-hemispherical spectra of samples that were hand-loaded as well as pressed into pellets using an integrating sphere attached to a Fourier transform infrared spectrometer. The results show that the methods used to prepare the sample can have a substantial effect on the measured reflectance spectra, as do other factors such as particle size.

Paper Details

Date Published: 22 May 2015
PDF: 6 pages
Proc. SPIE 9455, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XVI, 945505 (22 May 2015); doi: 10.1117/12.2179736
Show Author Affiliations
Carolyn S. Brauer, Pacific Northwest National Lab. (United States)
Timothy J. Johnson, Pacific Northwest National Lab. (United States)
Tanya L. Myers, Pacific Northwest National Lab. (United States)
Yin-Fong Su, Pacific Northwest National Lab. (United States)
Thomas A. Blake, Pacific Northwest National Lab. (United States)
Brenda M. Forland, Red Rocks Community College (United States)


Published in SPIE Proceedings Vol. 9455:
Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XVI
Augustus Way Fountain, Editor(s)

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