The electroabsorption spectra of As2Se3 single crystals are studied near 2 eV for polarization of light E o and E c. The low temperature spectra show fine structure related to indirect transitions with creation of phonons of an energy of 5, 11.5, 24.5, and 26.5 meV. This fine structure broadens rapidly above 50 K and disappears at 77 K. With rising temperature a low‐energy tail of the spectra develops which is attributed to indirect transitions with annihilation of phonons. The energy of the indirect gap is determined to 1.989 eV at 10 K. Above 100 K it decreases with a temperature coefficient of ‐6.25 ∧ 10−4 eV/K.
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Althaus et al. (1980) studied this question.
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