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Wyświetlanie 1-15 z 25
Tytuł:
Stereoselectivity Effect on Tb(III)-Eu(III) Energy Transfer in Complexes with Glutamic Acid and Alanine
Autorzy:
Legendziewicz, J.
Huskowska, E.
Stręk, W.
Łukowiak, E.
Sztucki, J.
Powiązania:
https://bibliotekanauki.pl/articles/1929811.pdf
Data publikacji:
1993-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.50.-j
34.20.-b
76.30.Kg
Opis:
The effect of stereoselectivity on energy transfer between Tb(III) and Eu(III) in crystals with glutamic acid and alanine was investigated. It was found that the stereoselectivity significantly changes the energy transfer in these systems. The theoretical model for the selective dependent energy transfer processes in lanthanide systems is developed and the nature of processes occurring in both systems under investigation briefly discussed.
Źródło:
Acta Physica Polonica A; 1993, 84, 5; 1021-1024
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
SrS:Eu and CaS:Eu Thin Films: Influence of Host Lattice on Kinetics of Europium Emission
Autorzy:
Świątek, K.
Godlewski, M.
Niinistö, L.
Leskelä, M.
Powiązania:
https://bibliotekanauki.pl/articles/1923720.pdf
Data publikacji:
1992-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Gs
76.30.Kg
78.55.Et
Opis:
In this paper we report the studies of photoluminescent properties of CaS:Eu and SrS:Eu thin films containing up to 3 mole % of Eu, grown by the atomic layer epitaxy method. The energy transfer and direct intrashell excitation channels of Eu ions are examined in function of temperature.
Źródło:
Acta Physica Polonica A; 1992, 82, 5; 769-772
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spin-Phonon Interactions for PbF$\text{}_{2}$:Gd$\text{}^{3+}$ - Comparison between Theory and Experiment
Autorzy:
Pastusiak, W.
Kuriata, J.
Powiązania:
https://bibliotekanauki.pl/articles/1920710.pdf
Data publikacji:
1992-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.Kg
Opis:
The results implying from two microscopic models for spin-phonon interactions are analyzed for the case of PbF$\text{}_{2}$:Gd$\text{}^{3+}$ It is shown that the two-phonon first-order mechanism predicts significant contributions to the values of the spin-phonon second-order coupling constants and the one-phonon second-order mechanism is less effective.
Źródło:
Acta Physica Polonica A; 1992, 81, 4-5; 599-603
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spin-Phonon Contributions to the b$\text{}_{2}^{0}$ Parameter for Gd$\text{}^{3+}$ in RbCdF$\text{}_{3}$ Single Crystals
Autorzy:
Guskos, N.
Kuriata, J.
Rewaj, T.
Powiązania:
https://bibliotekanauki.pl/articles/1920769.pdf
Data publikacji:
1992-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.Kg
Opis:
Temperature dependence of the b$\text{}_{2}^{0}$ spin-hamiltonian parameter for Gd$\text{}^{3+}$ in RbCdF$\text{}_{3}$ single crystals is described. The dependence is interpreted in terms of the 4f$\text{}^{7}$ electrons coupling to the whole phonon spectrum of the crystal. The presented data give also an insight into the dynamics of charge compensators causing a tetragonal distortion of the crystal field.
Źródło:
Acta Physica Polonica A; 1992, 81, 6; 659-665
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spin-Lattice Relaxation and Superposition Model Calculation in Gd$\text{}^{3+}$-Doped LiErF$\text{}_{4}$ and LiDyF$\text{}_{4}$ Crystals
Autorzy:
Misiak, L.
Powiązania:
https://bibliotekanauki.pl/articles/1928268.pdf
Data publikacji:
1993-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.Kg
Opis:
The X-band EPR measurements were performed on Gd$\text{}^{3+}$-doped LiErF$\text{}_{4}$ and LiDyF$\text{}_{4}$ single crystals at room temperature. The spin-lattice relaxation times were evaluated to be 2.7 × 10$\text{}^{-15}$ s, 1.0 × 10$\text{}^{-15}$ s and 2.2 × 10$\text{}^{-15}$ s for LiDyF$\text{}_{4}$ , LiErF$\text{}_{4}$ and LiYbF$\text{}_{4}$, respectively. Spin-Hamiltonian parameters are determined and discussed in the light of the superposition model in order to determine the distortion of Gd$\text{}^{3+}$ ion environment in LiREF$\text{}_{4}$ host lattices (RE = Yb, Y, Er, Dy, and Gd).
Źródło:
Acta Physica Polonica A; 1993, 83, 2; 195-207
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Slow Magnetic Relaxation in the Highly Anisotropic Layered Crystal CsNd(MoO₄)₂
Autorzy:
Tkáč, V.
Orendáčová, A.
Tarasenko, R.
Orendáč, M.
Feher, A.
Powiązania:
https://bibliotekanauki.pl/articles/1030440.pdf
Data publikacji:
2018-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.60.Es
76.30.Kg
75.30.Gw
75.40.Gb
Opis:
The present work is devoted to the magnetic relaxation study of the single crystal CsNd(MoO₄)₂ a layered rare-earth dimolybdate. AC susceptibility measurements performed in magnetic fields up to B=5 T applied along the easy and hard axis with frequency f ≈1 kHz revealed rather complex field-induced slow magnetic relaxation. Two relaxation regimes in different magnetic field intervals connected with magnetic interactions and possible single-ion relaxation mechanism were observed.
Źródło:
Acta Physica Polonica A; 2018, 133, 3; 466-469
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recombination Processes in ZnSe:Eu
Autorzy:
Świątek, K.
Godlewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1890962.pdf
Data publikacji:
1991-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Gs
76.30.Kg
78.50.Ge
Opis:
The photo-ESR and photoluminescence experiments have been performed on high-resistivity ZnSe:Eu crystals. We report the first evidence that the energy level of Eu$\text{}^{2+}$ ground state is located within the ZnSe forbidden gap, approximately 2.1 eV below the bottom of the conduction band.
Źródło:
Acta Physica Polonica A; 1991, 80, 3; 381-384
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recombination Processes for Deep Impurity States Degenerate with the Conduction Band
Autorzy:
Świątek, K.
Godlewski, M.
Kaliński, Z.
Przybylińska, H.
Powiązania:
https://bibliotekanauki.pl/articles/1879955.pdf
Data publikacji:
1991-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.50.-w
76.30.Kg
78.55.Hx
Opis:
We report on the studies of autoionization efficiency and the relevant recombination mechanism for Eu$\text{}^{2+}$ in Ca$\text{}_{x}$Cd$\text{}_{1-x}$F$\text{}_{2}$ depending on the energy level position of Eu$\text{}^{2+}$ excited states in respect to the conduction band states.
Źródło:
Acta Physica Polonica A; 1991, 79, 2-3; 243-246
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rare-Earth Excitation Mechanism in Wide Band Gap H-VI Compounds
Autorzy:
Karpińska, K.
Świątek, K.
Godlewski, M.
Niinistö, L.
Leskelä, M.
Powiązania:
https://bibliotekanauki.pl/articles/1929798.pdf
Data publikacji:
1993-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Gs
76.30.Kg
78.55.Et
Opis:
The excitation mechanism of rare-earth emission in Eu and Ce doped CaS and SrS is studied. It is proposed that the Eu and probably also Ce emission is induced by the photoionization transition of the rare-earth ion, which is followed by the carrier trapping via the excited state of the ion. At increased temperatures the efficiency of excitation is reduced. We explain this effect by the carrier emission from the excited core state of the rare-earth ion to the continuum of the conduction (valence) band states. It is also suggested that the charge transfer state of the rare-earth ion may act as the intermediate state in the carrier trapping.
Źródło:
Acta Physica Polonica A; 1993, 84, 5; 959-962
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parametrization of the Vibronic Contributions to the b$\text{}\text{}_{4}^{0}$ Spin-Hamiltonian Parameters for $\text{}^{8}$S$\text{}_{7}\text{}_{/}\text{}_{2}$ Ground State Ions in Fluoroperovskites
Autorzy:
Rewaj, T.
Kuriata, J.
Typek, J.
Buzare, J. Y.
Powiązania:
https://bibliotekanauki.pl/articles/1929837.pdf
Data publikacji:
1993-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.Kg
Opis:
Parametrization of phonon induced contributions to the experimentally determined temperature dependence of the b$\text{}_{0}^{4}$ spin-Hamiltonian parameter for Gd$\text{}_{3+}$ doped RbCaF$\text{}_{3}$, CsCaF$\text{}_{3}$, RbCdF$\text{}_{3}$ and TlCdF$\text{}_{3}$ single crystals is discussed. Three physically different parametrization schemes are considered, i.e. that of Einstein, Debye and Huang. It is found that the model of Huang, which predicts that the phonon induced contributions should be proportional to the Debye-Waller factor, describes best the experimental data. The method allowing determination of the Debye temperature from EPR data is also suggested.
Źródło:
Acta Physica Polonica A; 1993, 84, 6; 1143-1149
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
NMR Analysis of Mg Ion Localization in $LiNbO_{3}$ Crystal
Autorzy:
Yatsenko, A.
Yevdokimov, S.
Sugak, D.
Solskii, I.
Powiązania:
https://bibliotekanauki.pl/articles/1550498.pdf
Data publikacji:
2010-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.Fc
76.30.Kg
77.84.Ek
Opis:
The analysis of cation sublattices population in magnesium doped $LiNbO_{3}$ crystals is carried out. It is shown that volume concentration of lithium vacancies $(V_{Li})$ monotonously increases with increasing of MgO content in the crystal up to the threshold value. A series of $LiNbO_{3}$ crystals with various concentration of $Mg^{2+}$ were investigated by $\text{}^{7}Li$ and $\text{}^{93}Nb$ Nuclear Magnetic Resonance (NMR). It is concluded that the peculiarities of NMR spectra in Mg-doped $LiNbO_{3}$ crystals can be explained by the formation of defect complexes including $Mg_{Li}$ ions and $V_{Li}$ on the shortest distances between them.
Źródło:
Acta Physica Polonica A; 2010, 117, 1; 166-169
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic-Field Induced Slow Relaxation in the Ising-Like Quasi-One-Dimensional Ferromagnet KEr(MoO₄)₂
Autorzy:
Tkáč, V.
Orendáčová, A.
Dlháň, L'.
Orendáč, M.
Boča, R.
Feher, A.
Powiązania:
https://bibliotekanauki.pl/articles/1030249.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.60.Es
76.30.Kg
75.30.Gw
75.40.Gb
Opis:
We present the study of spin dynamics of KEr(MoO₄)₂ in the magnetic field applied along the hard axis c. The temperature dependence of AC susceptibility in zero magnetic field studied at frequencies f=10, 100, and 1000 Hz indicated the absence of relaxation in the temperature range from 2 to 20 K. Application of magnetic field induced a slow magnetic relaxation, which was investigated in detail in the field 0.5 T. The highest intensity of the relaxation process, reflected by the values of imaginary susceptibility was observed at 2 K. With increasing temperature, the relaxation process is weaker and vanishes completely above 3.5 K. Corresponding Cole-Cole diagrams were constructed and analyzed within a single relaxation process which can be associated with a direct relaxation process with a bottleneck effect, τ ≈1/T^b, and b=1.4. The slow relaxation at 2 K intensifies with increasing magnetic field at least up to 1 T.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 893-895
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Resonance and Dielectric Studies of a Nonlinear La$\text{}_{3}$Ga$\text{}_{5.5}$Ta$\text{}_{0.5}$O$\text{}_{14}$ Single Crystal Doped with Erbium
Autorzy:
Bodziony, T.
Typek, J.
Orlowski, M.
Majszczyk, J.
Wabia, M.
Berkowski, M.
Ryba-Romanowski, W.
Guskos, N.
Likodimos, V.
Anagnostakis, E. A.
Powiązania:
https://bibliotekanauki.pl/articles/2035732.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.Kg
77.22.Ch
Opis:
Single crystal of erbium doped La$\text{}_{3}$Ga$\text{}_{5.5}$Ta$\text{}_{0.5}$O$\text{}_{14}$ grown by the Czochralski method have been investigated by electron paramagnetic resonance and dielectric spectroscopy methods. Dielectric permittivity ε measurements performed in 90-440 K temperature range have shown negligible dispersion for 1 kHz - 1 MHz frequencies and a Curie-Weiss type behaviour with C=47700 K andθ=-340 K. Electron paramagnetic resonance studies have revealed the presence of two different paramagnetic, monoclinic centres. The calculated g factor values are: g$\text{}_{1}$=1.449, g$\text{}_{2}$=11. 534, g$\text{}_{3}$=4.24 for the main M$\text{}_{1}$ centre and g$\text{}_{1}$=1.98, g$\text{}_{2}$=4.169, g$\text{}_{3}$=4.25 for the weaker M$\text{}_{2}$ centre. The temperature dependence of EPR line intensity for centre M$\text{}_{1}$ and M$\text{}_{2}$ is quite different - while lines attributed to M$\text{}_{1}$ could only be observed at low temperatures, below 20 K, lines of M$\text{}_{2}$ centre persisted up to 200 K. The M$\text{}_{1}$ centre is connected with Er$\text{}^{3+}$ ion entering substitutionally into La$\text{}^{3+}$ site, while M$\text{}_{2}$ is probably connected with 3d ions at the same site, unintentionally introduced into the material as an admixture.
Źródło:
Acta Physica Polonica A; 2003, 103, 2-3; 315-322
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Properties of $La_3Ga_{5.5}Ta_{0.5}O_{14}$ Single Crystals Doped with Sm³⁺ and Er³⁺ Ions
Autorzy:
Kaczmarek, S.
Leniec, G.
Berkowski, M.
Kazan, S.
Acikgoz, M.
Powiązania:
https://bibliotekanauki.pl/articles/1398323.pdf
Data publikacji:
2017-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.10.Dg
76.30.Kg
75.30.Gw
75.40.Cx
Opis:
Electron paramagnetic resonance and magnetic susceptibility measurements were performed for two $La_3Ga_{5.5}Ta_{0.5}O_{14}$ single crystals doped with 1.96 at.% of Sm³⁺ ions and 3.8 at.% of Er³⁺ ions. Two magnetically inequivalent sites were found to be responsible for the electron paramagnetic resonance spectra of Sm³⁺ ions. Both sites reveal a low (at least C₂) symmetry with $g_{x}$~0.46, $g_{y}$~0.46 and $g_{z}$~0.52. The symmetry of isolated erbium ions is higher than C₂. From electron paramagnetic resonance and magnetic susceptibility experiments it results that the ground state of Er³⁺ ions is Γ⁶ or Γ⁷. Below 51 K electronic transitions within Γ⁶ doublets take place. Between 51 and 60 K, Γ⁶ to Γ⁷ transitions dominate, while above 60 K mainly transitions within Γ⁷ doublet are active.
Źródło:
Acta Physica Polonica A; 2017, 131, 3; 366-369
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Luminescence of $Cu^{+}$ and $Cu^{2+}$ Ions in CsBr Crystals
Autorzy:
Zorenko, Y.
Voznyak, T.
Turchak, R.
Powiązania:
https://bibliotekanauki.pl/articles/1550555.pdf
Data publikacji:
2010-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Hh
76.30.Kg
76.30.Lh
76.70.Dx
Opis:
The luminescence of $Cu^{+}$ and $Cu^{2+}$ ions in CsBr:Cu and CsBr:$CuBr_{2}$ crystals, respectively, is investigated under excitation by synchrotron radiation in the CsBr fundamental absorption range at 10 K and 300 K. The existence of the luminescence bands of different origin: (i) the intrinsic radiative transition of $Cu^{+}$ ions in the bands peaked at 2.61 eV and 2.23 eV, (ii) the recombination luminescence of $Cu^{2+}$ ions in the bands peaked at 2.55 eV and 2.13 eV, (iii) the luminescence of excitons localized around $Cu^{+}$ and $Cu^{2+}$ ions in the band peaked at 3.08 eV and 3.38 eV, respectively, was found in CsBr:Cu and CsBr:$CuBr_{2}$ crystals. The energies of creation of exciton localized around $Cu^{+}$ and $Cu^{2+}$ ions (6.06 eV and 6.09 eV, respectively, at 10 K) and excitons bound with these ions (5.83 eV and 5.99 eV at 300 K) were determined as well.
Źródło:
Acta Physica Polonica A; 2010, 117, 1; 199-202
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 25

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