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Browsing Articole din publicaţii internaţionale by Subject "bands"

Browsing Articole din publicaţii internaţionale by Subject "bands"

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  • The band structure of birefractive CdGa2S4 crystals 
    STAMOV, I. G.; SYRBU, N. N.; PARVAN, V. I.; ZALAMAI, V. V.; TIGINYANU, I. M. (Elservier, 2013)
    In this paper, we report on the spectral dependence of Δn=no−ne for CdGa2S4 single crystals for shorter and longer wavelengths than the isotropic wavelength λ0=485.7nm (300K). It was established that Δn is positive at λ>λ0 ...
  • The Band Structure of TlGaSe2 Crystals 
    SYRBU, N. N.; ZALAMAI, V. V.; STAMOV, G.; NEMERENCO, L. N. (Open Science Publishers, 2015)
    Energies of electron transitions for the energy diapason 2 - 6 eV were identified from the analysis of reflection and wavelength modulated reflection spectra measured at temperature 30 K. Bands parameters were determined ...
  • Birefringence and band structure of CdP2 crystals 
    BERIL, S. I.; STAMOV, I. G.; SYRBU, N. N.; ZALAMAI, V. V. (Elservier, 2013)
    The spatial dispersion in CdP2 crystals was investigated. The dispersion is positive (nk||с>nk||у) at λ>λ0 and negative (nk||с<nk||у) at λ<λ0. CdP2 crystals are isotropic for wavelength λо=896nm. Indirect transitions in ...
  • Birefringence and excitonic spectra of TlGaS2 crystals 
    STAMOV, I. G.; SYRBU, N. N.; URSAKI, V. V.; ZALAMAI, V. V. (ELSEVIER, 1999)
    The anisotropy of transmission spectra was investigated in TlGaS2 crystals. An intensive transmission line was found in samples placed between two crossed polarizers. Ground and excited states of excitons were detected in ...
  • Birefringence and excitonic spectra of TlGaS2 crystals 
    STAMOV, I. G.; SYRBU, N. N.; URSAKI, V. V.; ZALAMAI, V. V. (Elservier, 2013)
    The anisotropy of transmission spectra was investigated in TlGaS2 crystals. An intensive transmission line was found in samples placed between two crossed polarizers. Ground and excited states of excitons were detected in ...
  • Bound exciton in CuGaS2 
    SYRBU, N. N.; NEMERENCO, L. L.; BEJAN, V. N.; TEZLEVAN, V. E. (Elservier, 2007)
    In CuGaS2 crystals absorption and luminescence spectra at the temperature 9K at excitation by different wavelengths of Ar laser are investigated. A series of lines available in luminescence and absorption spectra is found. ...
  • The effect of oxygen on optical absorption and emission of Pr:Ga–La–S glass 
    SEDDON, A. B.; FURNISS, D.; IOVU, M. S.; SHUTOV, S. D.; SYRBU, N. N.; ANDRIESH, A. M.; ADRIAENSSENS, G. J. (Elservier, 2003)
    The absorption and emission spectra of Ga–La–S–O glasses with fixed cation ratio Ga/La=0.7/0.3 and two oxygen contents 0.65 wt% and 2.95 wt% were studied for two Pr3+ doping levels of 0.1 and 1.0 wt%. Presence of oxygen ...
  • Electronic transitions and energy band structure of CuGaxAl1-xSe2 crystals 
    MAȘNIK, A.; ZALAMAI, V.; URSAKI, V. (Elsevier, 2021)
    Optical reflectance spectra have been investigated at photon energies higher than the band gap of CuGaxAl1-xSe solid solutions with x values varying from 0 to 1. The spectral dependence of the real ε1 and imaginary ε2 ...
  • Energetic band structure of Zn3P2 crystals 
    STAMOV, I. G.; SYRBU, N. N.; DOROGAN, A. V. (Elservier, 2013)
    Optical functions n, k, ε1, ε2 and d2ε2/dE2 have been determined from experimental reflection spectra in the region of 1–10eV. The revealed electronic transitions are localized in the Brillouin zone. The magnitude of valence ...
  • Energy band structure and Frenkel excitons in PbGa2S4 
    STAMOV, I. G.; SYRBU, N. N.; URSAKI, V. V.; PARVAN, V. I.; ZALAMAI, V. V. (ELSEVIER, 2012)
    Optical reflection spectra are measured and calculated in PbGa2S4 crystals in the region of resonances related to excitons with large oscillator strength and binding energy (Frenkel excitons). The splitting of the upper ...
  • Energy band structure and optical constants of ZnAs2 crystals 
    STAMOV, I. G.; SYRBU, N. N.; URSAKI, V. V.; DOROGAN, A. V. (ELSEVIER, 2012)
    The fine structure of the Fabry–Perot interference as well as the interference of ordinary and extraordinary waves is investigated in ZnAs2 crystals. ε1, ε2, n and k optical constants are calculated in a wide spectral range ...
  • Exciton spectra and energy band structure of Cu2ZnSiSe4 
    GUC, M.; LEVCENKO, S.; DERMENJI, L.; GURIEVA, G.; SCHORR, S.; SYRBU, N. N.; ARUSHANOV, E. (Elservier, 2014)
    Exciton spectra are studied in Cu2ZnSiSe4 single crystals at 10 and 300K by means of reflection spectroscopy. The exciton parameters, dielectric constant and free carriers effective masses are deduced from experimental ...
  • Exciton spectra and energy band structure of CuGaSe2 single crystals 
    LEVCHENKO, S.; SYRBU, N. N.; TEZLEVAN, V. E.; ARUSHANOV, E.; MERINO, J. M.; LEÓN, M. (IOP Publishing, 2008)
    Photoreflectivity, wavelength modulation spectroscopy and photoluminescence measurements of CuGaSe2 are used to determine the exciton and band parameters as well as the energy band structure of CuGaSe2 at photon energies ...
  • Excitonic and band parameters in SnSe crystals 
    SYRBU, N. N.; ZALAMAI, V. V. (Elsevier, 2020)
    In the present work, absorption, reflection and wavelength modulated transmission spectra in wide temperature range 300–10 K in regions of the band gap minimum and of transitions to the excitonic band were studied.
  • Excitonic spectra and band structure of CdGa2Se4 birefractive crystals 
    SYRBU, N. N.; STAMOV, I. G.; PARVAN, V. I.; ZALAMAI, V. V.; TIGINYANU, I. M. (Elservier, 2013)
    We report on the intersection of spectral dependences of refractive indices no and ne at the wavelengths 546nm (λ0) and 450nm (λ01) in CdGa2Se4 single crystals. The value of difference Δn=ne−no is equal to zero at the ...
  • Excitonic spectra and energy band structure of ZnAl2Se4 crystals 
    SYRBU, N. N.; ZALAMAI, V. V.; TIRON, A. V.; TIGINYANU, I. M. (Elservier, 2015)
    Absorption, reflection and wavelength modulated reflection spectra were investigated in ZnAl2Se4 crystals. The energy positions of ground and excited states for three excitonic series (А, В and С) were determined. The main ...
  • Excitons and energetic bands structure of ZnP2-С2h 5 crystals 
    STAMOV, I. G.; DOROGAN, A. V.; SYRBU, N. N.; ZALAMAI, V. V. (Open Science Publishers, 2014)
    Reflectivity and transmittance spectra of ZnP2-C2h 5 crystals in the region of A, B and C excitons and E>Eg had been researched. The spectra had been calculated using dispersion correlations and the Kramers-Kronig correlations. ...
  • Frenkel excitons and band structure in Sb2S3 single crystals 
    BERIL, S. I.; STAMOV, I. G.; TIRON, A. V.; ZALAMAI, V. V.; SYRBU, N. N. (Elservier, 2020)
    Anisotropy of optical properties of Sb2S3 single crystals was investigated at 11 and 300 K. Ground and excited states of four excitonic states (A, B, C and D) were found out. Parameters of observed excitons and bands V1 – ...
  • Infrared lattice vibration spectra of monoclinic ZnP2 
    SOBOTTA, H.; NEUMANN, H.; SYRBU, N. N.; RIEDE, V. (WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim, 1983)
    The lattice vibrational properties of ZnP2 which is known to crystallize in a monoclinic and tetragonal modification with space groups P21/c and one of the enantiomorphs P41212 or P43212 respectively /1/, have been studied ...
  • Optical Phonons and Chemical Bonding in TlSbS2, TlSbSe2, and Tl3SbS3 Crystals 
    STAMOV, I. G.; SYRBU, N. N.; ZALAMAI, V. V. (Elservier, 2014)
    The emission lines of bound and free excitons and their phonon replicas were observed in the luminescence spectra of ZnP2-D48 crystals doped with Mn, Sn, Cd and Sb measured at 10K. The emission lines are described by the ...

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