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Gershenzon, E., Goltsman, G., Orlov, L., & Ptitsina, N. (1978). Population of excited-states of small admixtures in germanium. In Izv. Akad. Nauk SSSR, Seriya Fizicheskaya (Vol. 42, pp. 1154–1159). Mezhdunarodnaya Kniga 39 Dimitrova Ul., 113095 Moscow, Russia.
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Gershenzon, E. M., Orlova, S. L., Orlov, L. A., Ptitsina, N. G., & Rabinovich, R. I. (1976). Intervalley cyclotron-impurity resonance of electrons in n-Ge. JETP Lett., 24(3), 125–128.
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Gershenzon, E. M., Gol'tsman, G. N., & Ptitsina, N. G. (1976). Investigation of free excitons in Ge and their condensation at submillimeter wavelengths. Sov. Phys. JETP, 43(1), 116–122.
Abstract: Results are presented of an investigation of free excitons in Ge in the submillimeter wavelength range for low as well as for high excitation levels when interaction between the excitons becomes important. The free-exciton energy spectrum is discussed. It is shown that the drop radii and their concentrations can be determined by measuring the temperature dependence of the free-exciton concentration. A section of the phase diagram is obtained in the 0.5-2.8 K temperature range for the free excitons+condensate system.
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Gershenzon, E. M., Gol'tsman, G., & Ptitsina, N. G. (1973). Energy spectrum of free excitons in germanium. JETP Lett., 18(3), 93.
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Gershenzon, E. M., Gol'tsman, G. N., & Ptitsina, N. G. (1973). Submillimeter spectroscopy of semiconductors. Sov. Phys. JETP, 37(2), 299–304.
Abstract: The possibility is considered of carrying out submillimeter-wave spectral investigations of semiconductors by means of a high resolution spectrometer with backward-wave tubes. Results of a study of the excitation spectra of small impurities, D-(A +) centers and free excitons in germanium are presented.
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