Determination of Noise-Free Optical Constants in the Infrared by Kramers–Kronig Transformation of the Reflectance Ratio in s- and p-Polarization

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Abstract:

A method for Kramers–Kronig transformation of the reflectance ratio of s- and p-polarized light is discussed. The method is well suited for the determination of the optical constants of isotropic samples such as pellets prepared from powders. An algorithm is given that performs the transformation, including extrapolation at the data margins and an automated data fitting routine, that can handle very complex spectra of, e.g., biomacromolecules such as cellulose to obtain noise free spectra. Criteria for evaluation of the quality of the obtained data are given, and experimental data for cellulose II and xylane are presented.

Keywords: AUTOMATED PEAK DETECTION; BIOMACROMOLECULES; CELLULOSE; COMPLEX REFRACTIVE INDEX; KRAMERS-KRONIG TRANSFORMATION; NOISE-FREE OPTICAL CONSTANTS; POLARIZATION MODULATION; XYLANE

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370210791414452

Affiliations: Institute for Solid State Physics, Graz University of Technology, Graz, Austria; Christian Doppler Laboratory for Surface Chemical and Physical Fundamentals of Paper Strength, Graz, Austria

Publication date: June 1, 2010

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