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Wyświetlanie 1-15 z 879
Tytuł:
Use of Polarization Spectroscopy in Studies of Lanthanide Complexes in Solution
Autorzy:
Riehl, J. P.
Powiązania:
https://bibliotekanauki.pl/articles/1945466.pdf
Data publikacji:
1996-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.60.-b
Opis:
The use of linearly or circularly polarized light in the absorption or excitation beam in spectroscopic studies involving lanthanide ions, and the analysis of emitted light polarization has provided useful information concerning molecular structure, and excited state dynamics and energetics. Linear polarization studies may be used to aid in the assignment of crystal field components of electronic transitions, and circular polarization may be employed as a probe of chiral structure and structural changes. Examples of several of the different experimental techniques are presented and discussed.
Źródło:
Acta Physica Polonica A; 1996, 90, 1; 55-62
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low-Dimensional Thermoelectricity
Autorzy:
Heremans, J. P.
Powiązania:
https://bibliotekanauki.pl/articles/2043708.pdf
Data publikacji:
2005-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.10.-d
73.63.-b
81.07.-b
Opis:
Thermoelectric materials are used as solid-state heat pumps and as power generators. The low efficiency of devices based on conventional bulk thermoelectric materials confines their applications to niches in which their advantages in compactness and controllability outweigh that drawback. Recent developments in nanotechnologies have led to the development of thermoelectric nano-materials with double the efficiency of the best bulk materials, opening several new classes of applications for thermoelectric energy conversion technology. We review here first the physical mechanisms that result in the superior thermoelectric performance of low-dimensional solids, compared to bulk thermoelectric materials: they are a reduction of the lattice thermal conductivity, and an increase in the Seebeck coefficient S for a given carrier density. The second part of this review summarizes experimental results obtained on macroscopic arrays of bismuth, antimony, and zinc nanowires with diameters ranging from 200 to 7 nm. We show how size-quantization effects greatly increase S for a given carrier concentration, as long as the diameter of the nanowires remains above 9 nm, below which localization effects start dominating. In a third part, we give data on PbTe nanocomposites, particularly bulk samples containing 30~nm diameter Pb inclusions. These inclusions affect the electron scattering in such a way as to again increase the Seebeck coefficient.
Źródło:
Acta Physica Polonica A; 2005, 108, 4; 609-634
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Susceptibility Behaviour of CuGeO$\text{}_{3}$: Comparison between Experiment and the Quantum Transfer Matrix Approach
Autorzy:
Bieliński, M.
Renard, J.-P.
Powiązania:
https://bibliotekanauki.pl/articles/2013702.pdf
Data publikacji:
2000-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.10.Jm
75.40.Cx
75.40.Mg
Opis:
Thermodynamical properties of one-dimensional S=1/2 Heisenberg model with dimerized nearest- and uniform next-nearest-neighbour interactions are studied by the numerically exact quantum transfer matrix method and the results are applied to CuGeO$\text{}_{3}$. Suzuki-Trotter formula is used to obtain a classical system with spin σ=3/2 and effective interactions between nearest-neigbours only. Magnetic susceptibility curve is calculated and compared with new experimental results performed in a wide temperature range, revealing the presence of frustration in the model proposed for CuGeO$\text{}_{3}$.
Źródło:
Acta Physica Polonica A; 2000, 97, 5; 851-854
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Absorption Spectroscopy as a Probe of the Structure of Polyaminocarboxylate-Eu(III) Complexes in Solution
Autorzy:
Mondry, A.
Riehl, J. P.
Powiązania:
https://bibliotekanauki.pl/articles/1929802.pdf
Data publikacji:
1993-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.20.Wc
78.55.Hx
Opis:
Absorption spectroscopy was used to study the aqueous solution structure of Eu(III) complexes with DTPA (diethylenetriaminepentaacetic acid) and TTHA (triethylenetetraaminehexaacetic acid). Analysis of the oscillator strengths of the 4f ↔ 4f transitions and of the Judd-Ofelt intensity parameters, τ$\text{}_{λ}$, was performed in order to investigate the formation and the type of bonding in Eu(III)-DTPA and Eu(III)-TTHA species occurring in solution. The correlation of these results with those from other methods made it possible to suggest a relatively complete model of Eu(III)-polyaminocarboxylate coordination.
Źródło:
Acta Physica Polonica A; 1993, 84, 5; 969-974
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Epitaxially Induced Defects in Sr- and O-doped La$\text{}_{2}$CuO$\text{}_{4}$ Thin Films Grown by MBE: Implications for Transport Properties
Autorzy:
Locquet, J.-P
Williams, E. J.
Powiązania:
https://bibliotekanauki.pl/articles/1964235.pdf
Data publikacji:
1997-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Nn
74.62.Fj
81.15.Hi
74.72.Dn
Opis:
In this paper, the critical role played by various types of defects and strain relaxation mechanisms in high-T$\text{}_{c}$ thin films is highlighted and illustrated with examples. The defects are essential for providing adequate diffusion channels for oxygen ingress during the cooling step in c-axis thin films. The operation of strain relaxation mechanisms necessitated by the lattice mismatch between film and substrate can impose a compressive or tensile biaxial pressure, which either increases or reduces the critical temperature.
Źródło:
Acta Physica Polonica A; 1997, 92, 1; 69-84
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
IR Dispersion of Liquid CH$\text{}_{3}$I. I. Optical Constants and Integrated Intensities
Autorzy:
Czarnecki, M. A.
Hawranek, J. P.
Powiązania:
https://bibliotekanauki.pl/articles/1887263.pdf
Data publikacji:
1991-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.20.Ea
33.70.Fd
78.20.Dj
78.30.Cp
Opis:
The spectra of both components of the complex refractive index of liquid CH$\text{}_{3}$I were obtained in the infrared region using the thin film transmission method. Dispersion data and integrated intensities for principal bands were determined and discussed.
Źródło:
Acta Physica Polonica A; 1991, 79, 4; 437-450
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vibration and Luminescence Spectroscopic Investigations of the Alkali Rare Earth Double Phosphates M$\text{}_{3}$(RE,Eu)(PO$\text{}_{4}$)$\text{}_{2}$ (M=K, Rb; RE=La, Gd)
Autorzy:
Kloss, M.
Schwarz, L.
Hölsä, J. P. K.
Powiązania:
https://bibliotekanauki.pl/articles/1995573.pdf
Data publikacji:
1999-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.50.-f
61.66.Fn
63.20.-e
71.20.Dg
71.20.Eh
71.70.-d
78.30.-j
78.55.-m
Opis:
The room temperature IR- and Raman spectra of the different M$\text{}_{3}$RE(PO$\text{}_{4}$)$\text{}_{2}$ (M = K, Rb; RE = La, Eu, Gd) double phosphates were analysed and used to interpret the vibronic side band structure in the photoluminescence spectra. The intraconfigurational 4f-4f electronic transitions in the photoluminescence spectra of the Eu$\text{}^{3+}$ doped M$\text{}_{3}$RE(PO$\text{}_{4}$)$\text{}_{2}$ were analysed in detail. The crystal field fine structure of the $\text{}^{5}$D$\text{}_{0}$ → $\text{}^{7}$F$\text{}_{J}$ (J=0-4) transitions was analysed accounting for the information on the crystal structure. The effect of the temperature as well as the alkali host cation was evaluated. Finally, a preliminary crystal field energy level scheme for the $\text{}^{7}$F$\text{}_{J}$ (J=0-4) ground term was deduced from the analysis of the photo-luminescence as well as IR- and Raman spectra.
Źródło:
Acta Physica Polonica A; 1999, 95, 3; 343-349
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetism in Rare-Earth-Transition Metal Systems. Magnetization Reversal and Ultra-High Susceptibility in Sandwiched Thin Films Based on Rare-earth and Cobalt Alloys
Autorzy:
Baczewski, L.T.
Givord, D.
Alameda, J. M.
Dieny, B.
Nozieres, J. P.
Rebouillat, J. P.
Prejean, J. J.
Powiązania:
https://bibliotekanauki.pl/articles/1929319.pdf
Data publikacji:
1993-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.-m
75.30.Gw
75.70.-i
75.70.Fr
Opis:
This paper is composed of two parts: theoretical and experimental. The theoretical part is divided into several sections. The main characteristic properties of 3d (transition metals) and 4f (rare-earth metals) magnetism are explained in the second section. The properties of rare-earth-transition metal compounds are discussed in the third section, particularly with respect to applications. The fourth section is devoted to the rapidly growing field of magnetic thin films. Specifrc properties of ultra-thin films and multilayers are summarized. In the experimental part the original magnetic properties of sandwich films, consisting of a soft amorphous Co-Zr layer placed between two Sm-Co layers with different coercivities, are reported.
Źródło:
Acta Physica Polonica A; 1993, 83, 5; 629-641
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
X-Ray Magnetic Circular Dichroism and Compton Scattering: Application to 5f Electron Systems
Autorzy:
Kernavanois, N.
Sanchez, J. P.
Dalmas de Réotier, P.
Yaouanc, A.
Powiązania:
https://bibliotekanauki.pl/articles/2028918.pdf
Data publikacji:
2001-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.64.Ni
32.80.Cy
75.25.+z
75.75.+a
Opis:
The basic properties of magnetism depend strongly on the spin and orbital components of magnetization. Information about the magnetic moments can be gained using new techniques, like X-ray magnetic circular dichroism or Compton scattering, developed at third-generation synchrotron sources. After a brief introduction to the basic principles of these new magnetic tools, examples of experiments on 5f-electron based systems are presented.
Źródło:
Acta Physica Polonica A; 2001, 100, 5; 629-645
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Growth Conditions on Optical Properties of ZnCdSe/ZnSe Quantum Wells Grown by Molecular Beam Epitaxy
Autorzy:
Godlewski, M.
Bergman, J. P.
Monemar, B.
Kurtz, E.
Hommel, D.
Powiązania:
https://bibliotekanauki.pl/articles/1950749.pdf
Data publikacji:
1996-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.60.-p
71.35.+z
76.70.Hb
Opis:
The results of investigations of photoluminescence, time-resolved photoluminescence, photoluminescence kinetics and their temperature dependencies are discussed for two types of ZnCdSe/ZnSe multi quantum well structures - for pseudomorphic and for strain relaxed structure. Densities of 2D localized states and averaged localization energies, as seen by excitons, are determined from the photoluminescence kinetics measurements. We show distinct differences between exciton properties in two multi quantum well structures studied.
Źródło:
Acta Physica Polonica A; 1996, 90, 4; 785-788
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Properties of GaN Epilayers grown by Gas Source Molecular Beam Epitaxy on AlN Buffer Layer on (111) Si
Autorzy:
Godlewski, M.
Bergman, J. P.
Monemar, B.
Rossner, U.
Barski, A.
Powiązania:
https://bibliotekanauki.pl/articles/1950766.pdf
Data publikacji:
1996-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Eq
71.35.+z
78.47.+p
Opis:
Optical properties of GaN/AlN/Si (111) epilayers grown by MBE are studied. The observed decay transients of excitonic emissions and their temperature dependence is explained by an efficient transfer link between bound and free excitons.
Źródło:
Acta Physica Polonica A; 1996, 90, 4; 789-792
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Excitation and Recombination Processes in InAs$\text{}_{x}$P$\text{}_{1-x}$:Yb (x=0.04, 0.07 and 0.11)
Autorzy:
Godlewski, M.
Kozanecki, A.
Karpińska, K.
Bergman, J. P.
Monemar, B.
Powiązania:
https://bibliotekanauki.pl/articles/1932083.pdf
Data publikacji:
1995-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Eq
78.55.Cr
71.35.+z
Opis:
Excitation and recombination mechanisms of Yb$\text{}^{3+}$ 4f-4f intra-shell emission in InP and InAsP (4, 7 and 11% of As) are analyzed.
Źródło:
Acta Physica Polonica A; 1995, 87, 1; 217-220
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Volumetric, Optical, Acoustical and Viscometric Study of Molecular Association in Binary Mixtures of Butylamine with 1-Butanol and Tert-Butanol
Autorzy:
Singh, S.
Parveen, S.
Shukla, D.
Gupta, M.
Shukla, J. P.
Powiązania:
https://bibliotekanauki.pl/articles/2047348.pdf
Data publikacji:
2007-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.35.+d
62.60.+v
82.60.Lf
Opis:
Density (ρ), refractive index (n), ultrasonic velocity (u), and viscosity (η) were measured for the binary mixtures formed by butylamine with 1-butanol and tert-butanol at temperatures 293, 303, and 313 K over the entire composition range. Excess molar volume V$\text{}_{m}^{E}$, molar refraction deviation ΔR$\text{}_{m}$, deviation in ultrasonic velocity Δu, viscosity deviation Δη, and excess Gibb's free energy of activation for viscous flow ΔG$\text{}^{*E}$ were derived from the experimental data and the computed results were fitted to the Redlich-Kister polynomial equation. The values of V$\text{}_{m}^{E}$, ΔR$\text{}_{m}$, Δu, Δη, and ΔG$\text{}^{*E}$ were plotted against the mole fraction of butylamine. The observed positive and negative values of excess parameters for both the mixtures were explained on the basis of intermolecular interactions present in these mixtures. The higher negative values of V$\text{}_{m}^{E}$ and ΔR$\text{}_{m}$ and positive values of Δu, Δη, and ΔG$\text{}^{*E}$ for butylamine + 1-butanol mixture suggest that specific interactions are taking place in butylamine + 1-butanol mixture, while weak dipole-dipole induced forces and dispersive forces seem to be responsible for butylamine + tert-butanol mixture. Furthermore, different empirical relations were used to correlate the binary refractive indices. An excellent agreement was found between experimental and theoretical values.
Źródło:
Acta Physica Polonica A; 2007, 111, 6; 847-858
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Boundary Influence on Permittivity in Molecular Films
Autorzy:
Vučenović, S. M.
Šetrajčić, J. P.
Mirjanić, D. Lj.
Škipina, B.
Powiązania:
https://bibliotekanauki.pl/articles/2047859.pdf
Data publikacji:
2007-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.35.Aa
77.55.+f
78.20.-e
78.67.-n
Opis:
A microscopic theory of optical properties of thin molecular films, i.e. quasi 2D systems bounded by two surfaces parallel to XY planes was formulated. Harmonic exciton states were calculated using the method of two-time, retarded, temperature dependent Green's functions. It was shown that two types of excitations can occur: bulk and surface exciton states. Analysis of the optical properties (i.e. dielectrical permittivity) of these crystalline systems for low exciton concentration shows that the permittivity strongly depends on boundary parameters and the thickness of the film. Influences of boundary conditions on optical characteristics of these nanostructures were especially analyzed.
Źródło:
Acta Physica Polonica A; 2007, 112, 5; 963-968
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Refractive Indices, Order Parameter and Optical Transmittance Studies of a Nematic Liquid Crystal Mixture
Autorzy:
Singh, A. K.
Manohar, R.
Shukla, J. P.
Biradar, A. M.
Powiązania:
https://bibliotekanauki.pl/articles/2047089.pdf
Data publikacji:
2006-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.30.-v
42.70.Df
Opis:
Measurements of ordinary refractive index, birefringence, density, and order parameter were made on a technologically important nematogen and the data obtained for its nematic and isotropic phase were reported. A modified wedge method was used for the measurement of the birefringence (δ n). The nematic-isotropic phase transition temperature matches very well as is exhibited from the value of refractive indices and densities obtained using different techniques. The optical anisotropy and density data were used to determine the order parameter and principal polarizability of the nematic mixture using the Vuks approach and their temperature dependence was discussed. The macroscopic order parameter was obtained and compared with microscopic order parameter. These two values agree very well.
Źródło:
Acta Physica Polonica A; 2006, 110, 4; 485-493
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 879

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