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Gershenson, E. M., Gol'tsman, G. N., Elant'ev, A. I., Kagane, M. L., Multanovskii, V. V., & Ptitsina, N. G. (1983). Use of submillimeter backward-wave tube spectroscopy in determination of the chemical nature and concentration of residual impurities in pure semiconductors. Sov. Phys. Semicond., 17(8), 908–913.
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Gershenzon, E. M., Gol'tsman, G. N., & Kagane, M. L. (1978). Observation of free carrier resonances in p-type germanium at submillimeter wavelengths. Sov. Phys. Solid State, 20(4), 573–579.
Abstract: The spectrum of hole resonances in pure p-Ge for submillimetre in quantizing magnetic fields has been studied and identified. Measurements of photoconductivity spectra of p-Ge were made in the wave range lambda = 2-0.3 mm at temp. of 4.2-15 deg K in magnetic fields H up to 40 Measurements at various frequencies showed that the position of a series of characteristic resonances depends on the frequency of the illumination. This is in line with theoretical conclusions about the effective mass of the carriers increasing with rise in the magnetic field as a result of the interaction of the edge of the valency band with the split spin-orbital interaction of the sub 7 exp + band and the conduction band. The relative intensity of the quantum resonance lines of the free holes depends on the excitation conditions.
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Gershenzon, E. M., Gol'tsman, G. N., & Kagane, M. L. (1977). Energy spectrum of acceptors in germanium and its response to a magnetic field. Sov. Phys. JETP, 45(4), 769–776.
Abstract: We investigated the spectrum of the submillimeter photoconductivity of p-Ge at helium temperatures and the effects of a magnetic field up to 40 kOe on the spectrum. A large number of lines of transitions between the excited states of the acceptors was observed, some of the lines were identified, and the energies of a number of spectral levels B, Al, Ga, In, and TI in Ge were identified. The results are compared with calculations and with experimental data obtained from the spectra of the photoexcitation of the ground state of the impurities. Using one transition as an example, we discuss the splitting of the excited states of acceptors in the magnetic field and under uniaxial compression.
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Gershenzon, E., Goltsman, G., Elantev, A., & Kagane, M. (1978). Energy-spectrum of small donors and acceptors in germanium and effect of magnetic-field on it. In Izv. Akad. Nauk SSSR, Seriya Fizicheskaya (Vol. 42, pp. 1142–1148).
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