Abstract
In recent years infrared spectroscopy has been widely used to study soft mode behaviour in ferroelectric crystals, the usual approach being to measure the power reflectivity over a wide spectral range, calculate the phase spectrum using a Kramers-Kronig analysis, and hence compute the dielectric functions. The difficulties of this approach are well known but can only be avoided by measuring the phase spectrum directly by dispersive Fourier transform spectroscopy (DFTS). However, DFTS is not yet widely used because of the difficulty of measuring the phase spectrum as a function of temperature with sufficient accuracy.We have developed techniques for measuring the amplitude and phase reflection spectra of suitable solids by DFTS at temperatures down to 77 K. Satisfactory measurements can be made in the frequency range from 5 to 500 cm-1 using instruments equipped with either dielectric thin film or wire grid beam splitters. The phase spectrum can be determined with an error of less than 1° in the region of ...
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