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Browsing Articole ştiinţifice by Subject "absorption"

Browsing Articole ştiinţifice by Subject "absorption"

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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 ...
  • Effect of the topological transition on the optical absorption edge of sulphur-based glasses 
    TSIULYANU, D. I.; MARIAN, S. I. (WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 1996)
    Exponential absorption edge of chalcogenide glassy alloys with sulphur in the region of topological transition is studied. It is shown that the slope of the tail depends on mean coordination number and stoichiometry of the ...
  • Effective light absorption spectra of endogenic porphyrins in soft biotissue 
    SONTEA, V. P.; ABRAMOVICH, N. D.; BARUN, V. V.; DICK, S. K.; SERYAKOV, A. (IEEE, 2015)
    Light action spectra for main skin chromophores are simulated. Endogenic porphyrins (Pp IX, Cp III, and Up III) are selected as target chromophores. They can produce singlet oxygen (SO) under tissue irradiation, which acts ...
  • 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 ...
  • Energy Band Structure of the Tetragonal Crystals ZnP2 and CdP2 
    SOBOLEV, V. V.; SYRBU, N. N.; SUSHKEVICH, T. N. (John Wiley & Sons, Inc., 1971)
    The anisotropic spectra of edge absorption, photoconductivity, emission, and reflectivity of the tetragonal ZnP2 and CdP2 crystals have been experimentally investigated in the range 1 to 12.5 eV. The selection rules for ...
  • 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 ...
  • Free and bound exciton luminescence of ZnP2 –D48 
    SYRBU, N. N.; STAMOV, I. G.; DOROGAN, A. V.; NEMERENCO, L. L. (Academy of Sciences of Moldova, 2007)
    Thin structure of polarized absorption spectra of indirect transitions with phonon emission in the ZnP2 crystals is investigated. In the luminescence spectra, radiation of phonons at annihilation of free excitons ...
  • Infrared Absorption by Free Carriers in Quasi-One-Dimensional Organic Crystals of Tetrathiotetracene–Iodide 
    CASIAN, Anatolie; DUSCIAC, Viorel; NICIC, Veaceslav (American Scientific Publishers, 2011)
    The coefficient of long wave infrared (IR) absorption has been calculated at room temperature in quasi-one-dimensional organic crystals of TTT2I3 type (TTT is the tetrathiotetracene) as a function of radiation frequency ν ...
  • Interference of ordinary and extraordinary waves in AgAsS2 crystals 
    SYRBU, N. N.; STAMOV, I. G.; URSAKI, V. V.; PARVAN, V.; IVANENCO, Yu. (ELSEVIER, 2012)
    The anisotropy of the near-bandgap absorption is investigated in AgAsS2 crystals. The refraction indices, n and n respectively for the Ec and Ec polarizations as well as the spectral dependence of the refraction ...
  • Micro-oxygenation of wine in presence of dissolved carbon dioxide 
    DEVATINE, Audrey; CHICIUC, Igor; POUPOT, Christian; MIETTON-PEUCHOT, Martine (Elsevier, 2007)
    Techniques for micro-oxygenation of wines are now accepted practices in wine manufacturing. But, at present time, only wine tasting and empirical know-how are used to control the oxygen input. Our work aims at a better ...
  • New luminescent compounds based on chalcogenides and organic materials 
    IOVU, M. S.; ANDRIESH, A. M.; VERLAN, V. I.; BUZURNIUC, S. A.; CULEAC, I. P.; NISTOR, YU. H.; ZUBAREVA, V. (National Institute of Optoelectronics, Romania, 2009)
    Data concerning fabrication and luminescent properties of new composite materials on the base of organic coordination compounds of Eu(III) (Eu(TTA)3H2O, Eu(TTA)3Phen or Eu(DBM)3Phen dispersed in SBMA copolymer are presented. ...
  • Optical absorption and thermal expansion of semiconductor glasses As-S-Ge by topological transition 
    TSIULYANU, D.; GUMENYUK, N.; MARIAN, S. (Society of Photo-Optical Instrumentation Engineers, SPIE, 1995)
    The effect of mean coordination number r on the optical absorption in the region of exponential tail and on the thermal expansion of chalcogenide glasses As-S-Ge are presented. Several important parameters such as optical ...
  • Optical and photoelectrical properties and band structure of single crystals of solid solutions of the system (CdS)3x–(In2S3)1−x 
    RADAUTSAN, S. I.; SYRBU, N. N.; TEZLEVAN, V. E.; SHERBAN, K. F.; STRUMBAN, E. E. (WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim, 1973)
    The spectra of edge absorption, photoconductivity, and reflectivity of single crystals of solid solutions on the basis of CdIn2S4 have been studied. The values of Eg, the character of transitions responsible for Eg, the ...
  • Optical characterization of the new nanocomposite SBMA/Eu(TTA)3(Ph3PO)2 
    BORDIAN, Olga; VERLAN, Victor; CULEAC, Ion; IOVU, Mihail; ZUBAREVA, Vera; NISTOR, Iurie (SPIE, Society of Photo-Optical Instrumentation Engineers, 2015)
    We describe a new nanocomposite material based on the copolymer of styrene with butyl methacrylate (1:1) (SBMA), and coordinating compound of Europium(III) Eu(TTA)3(Ph3PO)2. The SBMA/Eu(TTA)3(Ph3PO)2 nanocomposite was ...
  • Optical Modulation Spectra of CdP2 Crystals and Ni-CdP2 Schottky Barriers 
    RADAUTSAN, S. I.; SYRBU, N. N.; KIOSEV, V. K. (WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim, 1974)
    The relative photosensitivity spectra of Ni-CdP2 Schottky barriers have been investigated experimentally; in these spectra a structure consisting of nine maxima has been observed in the intrinsic absorption region. The ...
  • Optical Properties and Energy Band Structure of Zn3P2and Cd3P2 Crystals 
    SOBOLEV, V. V.; SYRBU, N. N. (WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim, 1974)
    Edge absorption, photoconductivity, and reflectivity spectra are investigated of Zn3P2 crystals in the range from 1 to 12.5 eV and reflectivity spectra of Cd3P2 crystals in the range from 1 to 12.5 eV. The Eg value of Zn3P2 ...
  • Optical spectra and energy band structure of AgAsS2 crystals 
    STAMOV, I. G.; SYRBU, N. N.; URSAKI, V. V.; PARVAN, V. (ELSEVIER, 2012)
    Ground and excited states of three exciton series are observed in the region of fundamental absorption edge of AgAsS2 crystals. The contours of exciton reflection spectra are calculated and the main parameters of excitons ...
  • Optical spectra and energy band structure of single crystalline CuGaS2 and CuInS2 
    SOBOLEV, V. V.; SYRBU, N. N. (WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim, 1972)
    The anisotropic spectra of edge absorption, reflection, and photoconductivity of the monoclinic ZnP2, and ZnA2, crystals have been experimentally investigated at 293 and 77 °K. The group-theoretical calculations of selection ...
  • Optical spectra in the region of exciton resonances in quantum wells and quantum dots of In0.3Ga0.7As/GaAs heterostructures 
    SYRBU, N. N.; DOROGAN, V.; DOROGAN, A.; VIERU, T.; URSAKI, V. V.; ZALAMAI, V. V. (ELSEVIER, 2012)
    The transparency, reflection and luminescence spectra of In0.3Ga0.7As structures with 8nm thickness and quantum wells limited by the barrier layer GaAs of a 9nm (upper layer) and 100nm (bottom layer) thickness had been ...

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