Abstract
Techniques are described for making dispersive reflection measurements on solids between about 5 and 500cm −1 and at temperatures above 77 K using Fourier spectrometers equipped with dielectric or wire grid beam dividers and used in the asymmetric mode. Interferograms can be recorded with a positional accuracy of ±0.1 μm which is independent of the specimen temperature and the performance of the instruments is illustrated with amplitude reflection measurements on crystals of NaCl and CsI at room temperature. The ensuing dielectric response functions are also given and the TO and LO mode frequencies taken from these are in good agreement with published data. In the case of NaCl the self-energy and damping functions are also computed from the data and the results are in reasonable agreement with theoretical calculations by Hisano et al.
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