Resonance Raman scattering and excitonic spectra in TlInS2 crystals
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ZALAMAI, Victor; STAMOV, Ivan; SYRBU, Nicolae; URSAKI, Veacheslav; DOROGAN, Valerian. Resonance Raman scattering and excitonic spectra in TlInS2 crystals. In: Journal of Luminescence. 2015, nr. 160, pp. 195-201. ISSN 0022-2313.
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Journal of Luminescence
Numărul 160 / 2015 / ISSN 0022-2313

Resonance Raman scattering and excitonic spectra in TlInS2 crystals


Pag. 195-201

Zalamai Victor1, Stamov Ivan2, Syrbu Nicolae3, Ursaki Veacheslav1, Dorogan Valerian3
 
1 Institute of Applied Physics, Academy of Sciences of Moldova,
2 T.G. Shevchenko State University of Pridnestrovie, Tiraspol,
3 Technical University of Moldova
 
Disponibil în IBN: 18 decembrie 2017


Rezumat

The excitons ground and excited states for E∥a and E∥b polarizations in absorption and reflection spectra of TlInS2 crystals were detected. The fundamental parameters of excitons and bands were determined at k=0. The resonance Raman spectra were investigated in the region of excitons transitions. The resonance Raman scattering spectra with participation of optical phonons that are active at the center of Brillouin zone were identified. The Raman scattering in Y(YX)Z and Y(ZX)Z geometries at 10 K with excitation by He-Ne laser was researched. Energies of phonons with Ag and Bg symmetries were determined. It was shown that the number of modes at 10 K was two times lower than expected according to theoretical calculations.

Cuvinte-cheie
Excitons, Reflection and transmission spectra,

Optical phonons, Resonance Raman scattering, Thallium chalcogenides, Wavelength-modulated spectra

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