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    Wyświetlanie 1-4 z 4
    Tytuł:
    Electron-Phonon Coupling in Rare Earth Compounds
    Autorzy:
    Meijerink, A.
    Blasse, G.
    Sytsma, J.
    de Mello Donega, C.
    Ellens, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1945477.pdf
    Data publikacji:
    1996-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.70.Jg
    33.50.Dq
    33.50.Hv
    Opis:
    The variation in electron-phonon coupling strength for rare earth ions has been studied by measuring vibronic transition probabilities and temperature dependent line broadening for a large number of rare earth ions in different host lattices. The results show a large variation in the electron-phonon coupling strength (almost three orders of magnitude) and a remarkable trend: the coupling is strong for ions in the beginning and at the end of the lanthanide series and weak in the middle. In covalent host lattices the coupling is much stronger than in ionic host lattices. An explanation of the results is given and the consequences of the variation of the electron-phonon coupling strength on phenomena like multiphonon relaxation, energy transfer and cooperative luminescence are discussed.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 1; 109-119
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of Solute-Solvent Interactions on Radiationless Decay of Thioketones Excited to Their S$\text{}_{2}$- and T$\text{}_{1}$-States
    Autorzy:
    Szymański, M.
    Balicki, M.
    Binkowski, M.
    Kubicki, J.
    Maciejewski, A.
    Pawłowska, E.
    Wróżowa, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1945389.pdf
    Data publikacji:
    1996-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.50.Dq
    33.50.Hv
    35.80.Be
    Opis:
    Spectral and photophysical properties of a few aromatic thioketones in their S$\text{}_{2}$- and T$\text{}_{1}$-states, in particular those determined by their interactions with solvents, are discussed. The reasons for a drastically different behaviour of thioketones in interactions with benzene as well as saturated hydrocarbons and perfluoroalkanes are analysed in more detail. Results of the time-resolved transient absorption measurements in the pico- and nanosecond time scale are given. An analysis of these results proves that a product of the decay of the S$\text{}_{2}$-state of xanthione in benzene is a new transient (τ $\text{}_{1}\text{}_{/}\text{}_{e}$ ≥ 60 ps) individuum which, regarding the system properties and the conditions of the experiment, has been identified as an exciplex in S$\text{}_{2}$-state formed as a result of an efficient interaction with benzene molecule. Also in xanthione//alkane systems the involvement of a transient individuum was proved. Most probably, this individuum was a thioketyl radical which could be formed by hydrogen abstraction from a hydrocarbon molecule by xanthione in the S$\text{}_{2}$-state. Such individua act as intermediates in passing excitation to the triplet states of thioketones and are effective channels of the S$\text{}_{2}$-state decay. The changes observed in the transient absorption spectra of xanthione in C$\text{}_{6}$H$\text{}_{6}$ in the time range of 10$\text{}^{-7}$-10$\text{}^{-6}$ s can be attributed to the formation of an excimer in the T$\text{}_{1}$-state as a result of the T$\text{}_{1}$-state selfquenching.
    Źródło:
    Acta Physica Polonica A; 1996, 89, 4; 527-546
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Temperature Dependence of Luminescence Decay from the $\text{}^{4}$G $\text{}_{5}\text{}_{/}\text{}_{2}$ State of Sm$\text{}^{3+}$ in Cs$\text{}_{2}$NaSm$\text{}_{x}$Y$\text{}_{1-x}$Cl$\text{}_{6}$ and Cs$\text{}_{2}$NaSm$\text{}_{x}$Eu$\text{}_{y}$Y$\text{}_{1-x-y}$Cl$\text{}_{6}$
    Autorzy:
    Luxbacher, T.
    Fritzer, H. P.
    Flint, C. D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1945619.pdf
    Data publikacji:
    1996-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.50.Dq
    33.50.Hv
    78.55.Hx
    Opis:
    Luminescence decay curves for the $\text{}^{4}$G $\text{}_{5}\text{}_{/}\text{}_{2}$ → $\text{}^{6}$H $\text{}_{7}\text{}_{/}\text{}_{2}$ emission of Sm$\text{}^{3+}$ in the cubic hexachloroelpasolite crystals Cs$\text{}_{2}$NaSm$\text{}_{x}$Y$\text{}_{1-x}$Cl$\text{}_{6}$ (x=0.005 to x=1) and Cs$\text{}_{2}$NaSm$\text{}_{x}$Eu$\text{}_{y}$Y$\text{}_{1-x-y}$Cl$\text{}_{6}$ (x=0.01 to x=0.95, y=0.05 to y =0.99) have been measured over the temperature range 10 K to 300 K using pulsed laser excitation into the $\text{}^{4}$G $\text{}_{5}\text{}_{/}\text{}_{2}$ state of Sm$\text{}^{3+}$. The luminescence from this state is strongly quenched by cross relaxation to Sm$\text{}^{3+}$ acceptors and energy transfer to the $\text{}^{5}$D$\text{}_{0}$ state of Eu$\text{}^{3+}$. The temperature dependence of cross relaxation and of energy transfer is discussed in terms of the involved mechanisms.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 2; 307-313
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spectroscopic Study of Rare Earth Chromates: Relation to the Structure
    Autorzy:
    Antic-Fidancev, E.
    Lemaitre-Blaise, M.
    Parada, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1945460.pdf
    Data publikacji:
    1996-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.50.Dq
    33.50.Hv
    71.70.Ch
    78.50.Ec
    Opis:
    The luminescence spectra of the trivalent europium ion embedded in various rare earth chromates were analyzed. The spectroscopic data in most of chromates are in agreement with the structural determination but for some others the discrepancy between two methods is underlined. Energy level schemes were deduced from the experimental emission spectra and the crystal field simulation has been performed. The maximum splitting of the $\text{}^{7}$F$\text{}_{1}$ manifold of the Eu$\text{}^{3+}$ ion as a function of N$\text{}_{v}$, the so-called crystal field strength parameter, is given. This allows us to classify the compounds according to their crystal field extent.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 1; 33-44
    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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