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Wyszukujesz frazę "europium" wg kryterium: Wszystkie pola

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    Wyświetlanie 1-4 z 4
    Tytuł:
    Spectroscopic Studies of Neodymium and Europium Phosphoro-azo β-Diketonates
    Autorzy:
    Amirkhanov, V.
    Ovchinnikov, V.
    Legendziewicz, J.
    Graczyk, A.
    Hanuza, J.
    Macalik, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1945685.pdf
    Data publikacji:
    1996-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.20.Wc
    78.55.Hx
    78.20.Dj
    Opis:
    New complexes of lanthanides (Nd, Eu) with phosphoro-azo derivatives of β-diketones were synthesized. Optical properties of these compounds were investigated and confronted with the structure and single crystal spectra of different types of earlier reported lanthanide phosphoro-azo-β-diketonates. The exchange of the N-P-O-Me ligand group by the N-P-NR$\text{}_{2}$ one plays only a minor role in binding character of lanthanide ions but strongly affects biological functions and properties of lanthanide systems. In vitro experiment on cytotoxicity of the samples was performed using 10T$\text{}_{1}\text{}_{/}\text{}_{2}$ , L$\text{}_{1}$, MCF, DETA and Meω-132 cell lines.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 2; 455-460
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Properties of Europium Compounds with L- and DL-α-Alanine-Hydroxamic Acids
    Autorzy:
    Legendziewicz, J.
    Gawryszewska, P.
    Gałdecka, E.
    Gałdecki, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1945683.pdf
    Data publikacji:
    1996-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.20.Wc
    78.55.Hx
    61.66.Fn
    78.20.Dj
    Opis:
    Two of europium complexes with L- and DL-α-alanine-hydroxamic acids were synthesized. To our knowledge they are the first examples of X-ray and spectral data of lanthanide single crystals with hydroxamic acid derivatives. Both compounds consist of dimers in their structures, formed by two OH bridging groups of amino-hydroxamic acid molecules. Besides, two metal ions are chelated by CO and OH groups, forming five-membered rings. In the complex with L-ligand, different than in the DL-one, two additional perchloric acid molecules are included in crystal cavities and form hydrogen bondings with nitrogen and oxygen atoms of the ligand. Absorption, emission and excitation spectra were measured and analyzed at room and low temperatures. Structural effect of ligand chirality was found and its spectroscopic consequences are reported. The effect of the dimeric structure on spectroscopic properties is discussed.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 2; 439-446
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Europium Impurity on the Recombination Luminescence in Y₂O₃
    Autorzy:
    Novosad, S.
    Novosad, I.
    Bordun, O.
    Kostyk, L.
    Bordun, I.
    Tuzyak, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1029724.pdf
    Data publikacji:
    2018-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Hx
    78.60.Kn
    78.70.En
    Opis:
    In this work the researched results of the spectral characteristics of the luminescence and the thermostimulated luminescence curves of Y₂O₃ and Y₂O₃:Eu ceramic materials at the X-ray excitation in the 85-295 K range were generalized. Considering the features of Y₂O₃ crystal structure and the possibility of the formation of the short-lived and stable hole and electron centers of V- and F-type by the ionizing radiation X-ray luminescence spectrum of ceramics at 85 K is fitted into the elementary Gaussian shape bands with the maxima near 3.40, 3.06, 2.67, 2.33, 2.09, and 1.91 eV. The main 3.40 and 3.06 eV bands of the luminescence are caused by the self-trapped excitons of (YO₆)⁹¯ complex, when the cation is localized in the field of the trigonal (C_{3i}) and monoclinic (C₂) symmetries. The emission at 2.67 eV and the weak bands in the 1.65-2.61 eV region are considered as the radiation of excitons localized on the anion vacancies and the electron centers of F-type (F⁺, F and F¯). The thermoluminescence of Y₂O₃ in the 186 and 204 K main peaks range is connected with the thermal destruction of the self-trapped states of O¯ ions that located in the field of the trigonal and monoclinic symmetries. The activator bands caused by ⁵D→ ⁷F_{j} electronic transitions in Eu³⁺ are only observed in the X-ray and thermostimulated luminescence spectra of Y₂O₃:Eu ceramics. It was assumed that both at the X-rays irradiation and an optical excitation in the band of the charge transfer of Y₂O₃:Eu sample the energy goes to Eu³⁺ through (Eu²⁺O¯) complexes (states) of the charge transfer.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 4; 806-810
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Silver Surface Structure on Luminescence Characteristics of Europium Doped Polymer Films
    Autorzy:
    Denisenko, G. A.
    Malashkevich, G. E.
    Tziganova, T. V.
    Galstyan, V. G.
    Voitovich, A. P.
    Pershukevich, P. P.
    Kalosha, I. I.
    Bazilev, A. G.
    Mchedlishvili, B. V.
    Stręk, W.
    Oleinikov, V. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1945485.pdf
    Data publikacji:
    1996-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Hx
    Opis:
    The luminescence characteristics of Eu$\text{}^{3+}$ ions in Eu(NO$\text{}_{3}$)$\text{}_{3}$·6H$\text{}_{2}$O salt contained in polymer films coating the silver metallic surfaces were studied. The surfaces were specially prepared to consist of silver tip arrays with the height of tips in micron and surface density in 10$\text{}^{-8}$ cm$\text{}^{-2}$ ranges. The evaluation of enhancement per one europium ion gave a value 3.5 10$\text{}^{2}$ for one polymer layer coating of tip array silver surface in comparison with the case of glass substrate coating.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 1; 121-126
    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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