Abstract
The optical properties of pure and doped germanium single crystals of natural isotopic composition and isotopically pure 70Ge and 74Ge single crystals have been investigated. The influence of dopants and the presence of residual oxygen in germanium on the position and shape of phonon absorption peaks and on the attenuation coefficients for these peaks in the spectral range of 520–1000 cm−1 is experimentally revealed. The decrease in the frequency of peaks in phonon absorption bands with an increase in the mass number of germanium isotopes is analyzed.
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