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Refractive index dispersion and Raman scattering spectra of a germanium single crystal enriched with 70Ge isotope
Russian version
Kotereva T. V. 1, Gavva V. A.1, LipskiyV. A. 1, Nezhdanov A. V. 2, Belozerov Y. S. 1, Bulanov A. D. 1,2, Plotnichenko V. G. 3
1Devyatykh Institute of Chemistry of High-Purity Substances, Russian Academy of Sciences, Nizhny Novgorod, Russia
2Lobachevsky State University, Nizhny Novgorod, Russia
3Prokhorov General Physics Institute of the Russian Academy of Sciences, Dianov Fiber Optics Research Center, Moscow, Russia
Email: kotereva@ihps-nnov.ru
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The spectral dependence of the refractive index (RI) of a germanium single crystal enriched in the isotope 70Ge (>99.92 at.%) in the spectral range 5500-500 cm-1 (1.8-20 μm) was measured. The data obtained are compared with the results for single crystals of other germanium isotopes (72Ge, 73Ge, 74Ge, 76Ge). In the entire studied range, the refractive index values of 70Ge are higher than for heavier isotopes. This confirms the previously identified trend towards an increase in the RI with a decrease in the atomic mass of germanium isotopes. The Raman spectra of first- and second-order light scattering of a 70Ge single crystal at a temperature of 293 K. Keywords: elementary semiconductors, isotopic effects, interference refractometry, refractive index, Raman spectroscopy.
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