Abstract
Optical constants n and k have been calculated from normal incidence transmissivity spectra of thin crystals of Bi8Te7S5. In the 0.4–1 μ range the transmissivity data can be expressed in terms of three classical oscillators, only one of them in the wavelength range of experimental measurements. Only the very thinnest crystal, 5 atoms thick, shows a strong deviation from the bulk value of n. The k value is more thickness dependent.
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