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Title: Effects of Sample Preparation on the Infrared Reflectance Spectra of Powders

While reflectance spectroscopy is a useful tool in 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-packed 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 have a substantial effect on the measured reflectance spectra, as do other factors such as particle size.
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Conference: Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XVI, April 20, 2015, Baltimore, Maryland. Proceedings of the SPIE, 9455:Article No. 945505
SPIE, Bellingham, WA, United States(US).
Research Org:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
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Country of Publication:
United States
Reflectance; FTIR; powder; particle size; optical constants