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مصطلحات موضوعية: 010302 applied physics, Materials science, Physics and Astronomy (miscellaneous), Absorption spectroscopy, Terahertz radiation, Band gap, Doping, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, photomixer sources, Terahertz spectroscopy and technology, Impurity, Excited state, 0103 physical sciences, semiconductor spectroscopy, shallow-impurity transitions, Atomic physics, 0210 nano-technology, Spectroscopy