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    Wyświetlanie 1-4 z 4
    Tytuł:
    Luminescence Spectra of Quantum-Sized CdS and PbI$\text{}_{2}$ Particles in Static Electric Field
    Autorzy:
    Artemyev, M. V.
    Yablonski, G. P.
    Rakovich, Yu. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1877002.pdf
    Data publikacji:
    1995-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.10.Jy
    78.55.Hx
    Opis:
    The influence of external electric field was studied on the luminescence behavior of quantum-sized CdS and PbI$\text{}_{2}$ nanocrystals, embedded in various polymeric films. The clear increase in the photoluminescence intensity from the quantum-sized particles was observed, as well as the spectral shift of photoluminescence bands. The mechanism proposed is based on the field-induced oxygen desorption from the nanocrystal surface which is the good photoluminescence inhibitor.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 2; 523-527
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Caracterisation de l'ordre par diffraction d'electrons
    Autorzy:
    Le Bosse, J. C.
    Lopez, J.
    Hansali, G.
    Wiatrowski, G.
    Rousseau, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929266.pdf
    Data publikacji:
    1993-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.14.Dc
    68.10.Jy
    Opis:
    CHARACTERIZATION OF THE ORDER BY ELECTRON DIFFRACTION: In the case of a solid with a local atomic order, we can consider only a statistical description of atomic positions. For a homogeneous phase, this description is given by the two-site occupancy correlation function, the three-site occupancy correlation function, ... etc. The local atomic order is investigated by experiments in which the solid is bombarded with a well-collimated monoenergetic beam of particles (here electrons). Starting from a model describing the force law between an electron and an atomic scatterer and from a model of the solid describing the distribution of atoms in space, a computation of elastically backscattered intensities can be carried out. The latter depends on geometrical parameters which are determined in such a way that one gets the best agreement between the results of calculation and the measurements. This work aims to provide the way of proceeding to calculate the diffuse intensity. The main difficulty in this task appears when we undertake to treat the problem of multiple scattering. We provide here a detailed description of a calculation corresponding to the case of the backscattering of electrons at a single crystal surface covered with a partially disordered atomic layer. Assuming that the coverage in adatoms is small and these adatoms are weak scatterers, we can neglect the multiple scattering events inside the layer. This simplifying assumption leads to an expression of the diffuse intensity in terms of: the Fourier transform on the 2D surface lattice of the pair correlation function; the renormalized transition matrices of the different kinds of adatoms.
    Źródło:
    Acta Physica Polonica A; 1993, 83, 5; 567-580
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spatially Resolved Chemistry on Bimetallic Surfaces
    Autorzy:
    Behm, R. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968689.pdf
    Data publikacji:
    1998-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.16.Ch
    68.10.Jy
    82.65.-i
    Opis:
    The local chemical properties of bimetallic surfaces, which are often drastically different from those of each of the components, will be discussed. Using CO adsorption as a probe molecule it will be shown for two model systems, Au/Pd(111) and Pt/Ru(0001), that their chemical properties depend decisively on the local surface structure and that the correct interpretation of area integrating spectroscopic and kinetic data obtained from such surfaces requires detailed knowledge of their (defect) structure and of the distribution of the different components in the surface layer. It will further be shown that information on the local chemical properties of specific structural elements such as monolayer islands and monolayer island edges, and specific surface ensembles can be gained by applying high resolution scanning tunneling microscopy imaging and area integrating spectroscopic techniques in combination to bimetallic surfaces whose morphology and composition is varied in a systematic and controlled way. Based on experimental results adsorption on a monolayer A / substrate B system is suggested as a model for gaining information on the modifications in chemical properties of AB alloy surfaces due to metal-metal interactions.
    Źródło:
    Acta Physica Polonica A; 1998, 93, 2; 259-272
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of Submonolayer Coverages Using Auger Escape Depths
    Autorzy:
    Godowski, P. J.
    Hardegree, E. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1931323.pdf
    Data publikacji:
    1994-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.20.Fv
    68.10.Jy
    82.65.My
    Opis:
    A simple method for determining submonolayer adsorbate coverages by means of Auger electron spectroscopy is presented. The procedure is based on the ratio of low to high kinetic energy Auger signals from the substrate alone, therefore it does not require a direct measurement of adsorbate peaks. It may be of special interest in cases where the adsorbate signal is difficult or impossible to measure, as well as when adsorbate and substrate peaks overlap or when peaks are absent (H or He) or of low intensity. The method is tested by quantification of sulphur layer on the Ni(001) and on the polycrystalline iron surface.
    Źródło:
    Acta Physica Polonica A; 1994, 85, 5; 843-848
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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