Quantitative Interpretation of Infrared Diffuse Reflectance Spectra over Whole Concentration Range
- 1 July 1981
- journal article
- research article
- Published by Oxford University Press (OUP) in Bulletin of the Chemical Society of Japan
- Vol. 54 (7) , 1964-1967
- https://doi.org/10.1246/bcsj.54.1964
Abstract
The infrared diffuse reflectance spectra of CaCO3 dispersed in KBr and Si were measured over a wide concentration range. The relation between relative reflectance and concentration varies with dispersing medium. The relation follows the Kubelka-Munk (K-M) equation only in the low concentration region. The deviation in the high concentration region from the K-M equation changes with wavelength and dispersing medium. The results over the whole concentration range can be interpreted by means of a modified K-M equation in which the difference in the scattering coefficients between the sample and the dispersing medium is taken into account. The tendency of scattering coefficients of CaCO3, KBr, and Si calculated by the modified Kubelka-Munk equation agrees with that of refractive indexes.Keywords
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