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Browsing Articole ştiinţifice by Subject "vibrational modes"

Browsing Articole ştiinţifice by Subject "vibrational modes"

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  • Davydov multiplets in vibrational spectra of and crystals 
    SYRBU, N. N.; CEBOTARI, V. Z. (IOP Publishing, 1998)
    In this paper the Raman vibrational spectra for all actually realized geometries of and crystals at 77 K, and infrared reflectivity spectra for both and polarizations in the range from 50 to at 300 K have been investigated. ...
  • Double Davydov resonance in the vibrational spectra of Tl3AsS4 and Tl3PS4 crystals 
    SYRBU, N. N.; KRASOVSKY, V. T. (Elservier, 1995)
    Raman spectra of Tl3AsS4 and Tl3PS4 have been investigated at 300 and 77 K. The vibrational modes Ag, B1g, B2g and B3g are determined. The vibrational mode splittings caused by Davydov resonances are determined. Infrared ...
  • Exciton and phonon spectra of acoustooptic Tl3AsS3 crystals 
    GITSU, D. V.; SYRBU, N. N.; PRUNICH, P. I.; POPESKU, A. A. (Springer Nature Switzerland, 2001)
    The λ-modulated exciton reflection spectra of Tl3AsS3 crystals are investigated at 8 and 77 K, in which the ground (n=1) and excited (n=2, 3) exciton states are revealed. Taking into account the spatial dispersion, the ...
  • Infrared vibrational Modes in Tl3SbS3, Tl3AsS3, and Tl3AsSe3 crystals 
    SYRBU, N. N.; KRASOVSKY, V. T.; GRINCHESHEN, I. N. (WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim, 1994)
    Reflectivity spectra of Tl3SbS3, Tl3AsS3, and Tl3AsSe3 crystals have been investigated in the wave number range 50–600 cm−1 for the polarizations E∥c and E c. The fundamental phonon parameters, the limiting dielectric ...
  • Lattice dynamics of ZnAl2O4 and ZnGa2O4 under high pressure 
    LÓPEZ-MORENO, S.; RODRÍGUEZ-HERNÁNDEZ, P.; MUÑOZ, A.; ROMERO, A. H.; MANJÓN, F. J.; ERRANDONEA, D.; RUSU, E.; URSAKI, V. V. (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2011)
    In this work we present a first-principles density functional study of the vibrational properties of ZnAl2O4 and ZnGa2O4 as function of hydrostatic pressure. Based on our previous structural characterization of these two ...
  • Oblique Phonons in Raman Scattering and IR Reflection of TeO2 Crystal 
    SYRBU, N. N.; CRETU, R. V.; CEBOTARI, V. Z.; MUSHINSKII, V. P. (WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim, 1996)
    The Raman scattering and IR reflectivity have been investigated for different crystal configurations. The contours of reflectivity spectra have been calculated. The angle dependence of polar vibrational modes in both ...
  • Optical Phonons and Chemical Bonding in TlSbS2, TlSbSe2, and Tl3SbS3 Crystals 
    SYRBU, N. N.; KRASOVSKY, V. T.; GRINCHESHEN, I. N. (WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim, 1993)
    The optical phonons at k = 0 of TlSbS2, TlSbSe2, and Tl3SbS3 have been investigated by infrared reflectivity measurements from 50 to 4000 cm−1 at 300 K. The factor group analysis of vibrational modes of TlSbS2 and Tl3SbS3 ...
  • Polar vibrational modes in Ag3AsS3 crystals 
    SYRBU, N. N.; CEBOTARI, V. Z.; BOGDANASH, M. (Elservier, 1996)
    Reflectivity spectra of Ag3AsS3 crystals have been investigated in the range from 50 to 4000 cm−1 for E∥÷c and E ⊥ c polarizations, and practically all expected vibrational modes of A1 and E symmetry have been found. Phonon ...

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