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Gershenzon EM, Orlov LA, Ptitsina NG. Absorption spectra in electron transitions between excited states of impurities in germanium. JETP Lett. 1975;22(4):95–7.
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Gershenzon E, Goltsman G, Orlov L, Ptitsina N. Population of excited-states of small admixtures in germanium. In: Izv. Akad. Nauk SSSR, Seriya Fizicheskaya. Vol 42. Mezhdunarodnaya Kniga 39 Dimitrova Ul., 113095 Moscow, Russia; 1978. p. 1154–9.
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Gershenzon EM, Gol'tsman GN, Ptitsyna NG. Carrier lifetime in excited states of shallow impurities in germanium. JETP Lett. 1977;25(12):539–43.
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Gorokhov G, Bychanok D, Gayduchenko I, Rogov Y, Zhukova E, Zhukov S, et al. THz spectroscopy as a versatile tool for filler distribution diagnostics in polymer nanocomposites. Polymers (Basel). 2020;12(12):3037 (1 to 14).
Abstract: Polymer composites containing nanocarbon fillers are under intensive investigation worldwide due to their remarkable electromagnetic properties distinguished not only by components as such, but the distribution and interaction of the fillers inside the polymer matrix. The theory herein reveals that a particular effect connected with the homogeneity of a composite manifests itself in the terahertz range. Transmission time-domain terahertz spectroscopy was applied to the investigation of nanocomposites obtained by co-extrusion of PLA polymer with additions of graphene nanoplatelets and multi-walled carbon nanotubes. The THz peak of permittivity's imaginary part predicted by the applied model was experimentally shown for GNP-containing composites both below and above the percolation threshold. The physical nature of the peak was explained by the impact on filler particles excluded from the percolation network due to the peculiarities of filler distribution. Terahertz spectroscopy as a versatile instrument of filler distribution diagnostics is discussed.
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