The absorption spectra of single crystals of PbS, PbSe and PbTe have been examined in the temperature range from 20°K to 600°K The spectra are characterized by a sharp absorption edge which comcides with the long wavelength limit of photoconductivity in each material. At longer wavelengths the absorption coefficient increases slowly with increasing wavelength, as in germanium and silicon
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A F Gibson (1952) studied this question.
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