Gershenzon EM, Gol'tsman GN, Ptitsina NG. Submillimeter spectroscopy of semiconductors. Sov Phys JETP. 1973;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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