Angular Dependence of Diffuse Reflectance Infrared Spectra. Part III: Linearity of Kubelka-Munk Plots

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The linearity of plots of the Kubelka-Munk function against concentration is investigated for weak and strong absorption bands in the spectrum of a typical organic analyte, caffeine. The linear region is extended when measurements are made with an off-axis optical geometry, in comparison to an in-line configuration. For the latter configuration, the linearity is improved when crossed polarizers are placed before and after the sample.

Keywords: Diffuse reflectance; FT-IR spectrometry; Infrared; Kubelka-Munk function; Reflectance spectroscopy; Spectrogoniophotometer; Spectroscopic techniques

Document Type: Research Article


Affiliations: Department of Chemistry, University of California, Riverside, California 92521-0403

Publication date: February 1, 1988

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