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Wyświetlanie 1-15 z 16
Tytuł:
Synthesis and Characterization of a Water-Soluble Ionic Polyacetylene Derivative
Autorzy:
Gal, Y.
Jin, S.
Park, J.
Lim, K.
Powiązania:
https://bibliotekanauki.pl/articles/1398739.pdf
Data publikacji:
2016-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.80.L
73.61.P
78.20.C
78.30.J
Opis:
A new water-soluble ionic polyacetylene was synthesized by the acid-catalyzed polymerization of 2-ethynylpyridine using acrylic acid. The polymerization proceeded well to give a high yield of polymer. The acetylenic C ≡ C bond stretching (2110 cm¯¹) and acetylenic ≡ C-H bond stretching (3293 cm¯¹) peaks of 2-ethynylpyridine monomer were not seen in the FT-IR spectrum of polymer. The electro-optical and electrical properties of the ionic polyacetylene were measured and discussed. The resulting polymer showed strong maximum at 513 nm in the UV-Visible absorption, which is corresponding to photon energy of 2.42 eV. The energy gap width of polymer was estimated to be of 2.08 eV. It was observed that the electrochemical process of polymer is reproducible in the potential range of -1.80 to 1.60 V vs Ag/AgNO₃. HOMO and LUMO levels of polymer were 4.85 eV and 2.77 eV, respectively.
Źródło:
Acta Physica Polonica A; 2016, 129, 4; 642-646
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical and Scintillation Properties of $Bi_{4}(Ge_{x}S_{1-x})_{3}O_{12}$ Single Crystal
Autorzy:
Xiao, X.
Xu, J.
Lu, B.
Cai, W.
Zhang, Y.
Shen, H.
Yang, B.
Xiang, W.
Powiązania:
https://bibliotekanauki.pl/articles/1399369.pdf
Data publikacji:
2015-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.10.Fq
61.05.C-
78.20.Ci
78.70.Ps
Opis:
The solid solution crystals, $Bi_{4}(Ge_{x}Si_{1-x})_{3}O_{12}$ (BGSO) with x=0, 0.05, and 0.15, have been grown by the modified vertical Bridgman method. The as-grown crystals show 80% of transmittance with an absorption edge of 285 nm. The relative light yields of BGSO crystals are found to be 7.2%, 6.3%, and 4.2% of CsI(Tl) crystal for x=0, 0.05, and 0.15, respectively. The energy resolutions of these crystals are 18.9%, 21.3%, and 24.7%, respectively, with PMT for 662 keV gamma rays at room temperature when exposed to $\text{}^{137}Cs$ γ -ray. The scintillation performance of BGSO crystals clearly deteriorates with the increase of Ge content. However, the appropriate number of germanium ions doped to BSO crystal can improve its crystallization behavior and effectively restrain component segregation. It is expected that large size crystals of BGSO will be grown and applied to the dual readout calorimeter in the nearest future.
Źródło:
Acta Physica Polonica A; 2015, 127, 3; 854-858
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Elastooptic Constants of SrLaAlO$\text{}_{4}$ and SrLaGaO$\text{}_{4}$ Single Crystals Determined by Brillouin Scattering
Autorzy:
Drozdowski, M.
Pajączkowska, A.
Kasprowicz, D.
Ziobrowski, P.
Gloubokov, A.
Powiązania:
https://bibliotekanauki.pl/articles/1964361.pdf
Data publikacji:
1997-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.20.Fb
78.35.+c
63.20.-e
Opis:
In this paper we report the elastooptic constants p$\text{}_{ij}$ of strontium lanthanum aluminate, SrLaAlO$\text{}_{4}$ and strontium lanthanum gallate SrLaGaO$\text{}_{4}$ single crystals, which were determined at room temperature using Brillouin scattering method. In order to investigate the elastooptic constants of SrLaAlO$\text{}_{4}$ and SrLaGaO$\text{}_{4}$ single crystals, a substitution method proposed by Cummins and Schoen, and developed by Nelson and Lax was used. The obtained results are also discussed in terms of the nature defects which might arise in these crystals during growth process.
Źródło:
Acta Physica Polonica A; 1997, 92, 1; 177-181
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magneto-Optical Studies of Narrow Band-Gap Heterostructures with Type II Quantum Dots InSb in an InAs Matrix
Autorzy:
Mukhin, M.
Terent'ev, Ya.
Golub, L.
Nestoklon, M.
Meltser, B.
Semenov, A.
Solov'ev, V.
Sitnikova, A.
Toropov, A.
Ivanov, S.
Powiązania:
https://bibliotekanauki.pl/articles/1492858.pdf
Data publikacji:
2011-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.75.-c
71.70.Ej
78.55.Cr
78.67.Hc
78.20.Ls
75.40.Mg
Opis:
Magneto-optical properties of type II heterostructures with InSb/InAs quantum dots has been studied at external magnetic field applied in the Faraday geometry. The emission polarization degree can be changed in the range from 100% σ-minus to 10% σ-plus due to excitation intensity and temperature variation. The detailed calculation of the band structure within a tight-binding approximation is presented. The simulation of the experimental data reveals that the oscillator strength of the optical transitions involving electrons with the spin oriented along and opposite to the magnetic field vector differs by approximately 1.8 times in the heterostructures under study.
Źródło:
Acta Physica Polonica A; 2011, 120, 5; 868-869
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Elastic Properties of Zinc Blende MnTe
Autorzy:
Djemia, P.
Roussigné, Y.
Stashkevich, A.
Szuszkiewicz, W.
Gonzalez Szwacki, N.
Dynowska, E.
Janik, E.
Kowalski, B. J.
Karczewski, G.
Bogusławski, P.
Jouanne, M.
Morhange, J.
Powiązania:
https://bibliotekanauki.pl/articles/2038250.pdf
Data publikacji:
2004-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.Dc
75.50.Pp
78.35.+c
Opis:
The Brillouin light scattering was used to investigate elastic properties of the zinc blende, MBE-grown MnTe layer that was deposited on a (001) GaAs substrate covered by CdTe buffer layer. The three elastic constants of the zinc blende MnTe, namely c$\text{}_{11}$, c$\text{}_{12}$, and c$\text{}_{44}$, were directly determined for the first time from the frequency of the Rayleigh mode, of the pseudo-surface mode, and of the shear horizontal bulk mode traveling parallel to the layer surface. The value of c$\text{}_{11}$ was checked using the frequency of longitudinal bulk waves propagating at different angles from the normal of the layer plane. This value was also independently determined by results of the folding of acoustic phonons, observed for MnTe/CdTe superlattices by the Raman scattering. Finally, the bulk modulus given by the formula B=(c$\text{}_{11}$+2c$\text{}_{12}$)/3 was determined for zinc blende MnTe by ab initio calculations making use of the density functional theory and atomic pseudopotentials; spin polarization of MnTe was taken into account. A satisfactory agreement between theoretical and experimental values was obtained.
Źródło:
Acta Physica Polonica A; 2004, 106, 2; 239-247
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural and Optical Properties of Nanostructured Fe-Doped SnO₂
Autorzy:
Saleh, S.
Ibrahim, A.
Mohamed, S.
Powiązania:
https://bibliotekanauki.pl/articles/1398977.pdf
Data publikacji:
2016-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.-b
61.05.C-
78.20.-e
Opis:
Nanocrystalline $Sn_{1-x}Fe_xO_2$ (where x = 0, 0.01, 0.02, 0.03 and 0.04) powders have been successfully synthesized by the hydrothermal method followed by sintering at 1000°C for 3 h. The morphology and structure of the samples have been analyzed by field emission scanning electron microscope and X-ray diffraction, respectively. X-ray diffraction results revealed that all diffraction peaks positions agree well with the reflection of a tetragonal rutile structure of SnO₂ phase without extra peaks. The formation of a tetragonal rutile structure of SnO₂ nanostructures was further supported by the Raman spectra. The band gap of Fe-doped SnO₂ nanoparticles was estimated from the diffuse reflectance spectra using the Kubelka-Munk function and it was decreasing slightly with the increase of Fe ion concentration from 3.59 to 3.52 eV. The variation in band gap is attributed predominantly to the lattice strain and particle size. The presence of chemical bonding was confirmed by the Fourier transform infrared spectra.
Źródło:
Acta Physica Polonica A; 2016, 129, 6; 1220-1225
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polariton Effects in Molecular Crystals Studied by Classical and Quantum-Electrodynamic Approaches
Autorzy:
Stradomska, A.
Petelenz, P.
Powiązania:
https://bibliotekanauki.pl/articles/1814012.pdf
Data publikacji:
2007-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.35.-y
71.36.+c
78.20.Ci
Opis:
A quantum-electrodynamic approach is studied as an alternative to the classical description of polaritons in molecular crystals, with the focus on future interpretation of oligothiophene spectra. As expected, the results of the two approaches coincide, but the quantum description is better suited for future generalizations, notably for detailed studies of vibronic coupling. The quantum approach is used here to probe the importance of inherent polaritonic effects. They are found to be minor, being superseded by vibronic interactions; the latter are responsible for most peculiarities observed in oligothiophene spectra.
Źródło:
Acta Physica Polonica A; 2007, 112, S; S-161-S-170
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anomalous Phase Transitions in $LiCsSO_4$ in the Compressible hcp Ising Model
Autorzy:
Lehmann-Szweykowska, A.
Kurzyński, M.
Wojciechowski, R.
Wiesner, M.
Mróz, B.
Powiązania:
https://bibliotekanauki.pl/articles/1427164.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.35.+c
75.10.Hk
62.20.D-
Opis:
Structural low-temperature phase transformations in $LiCsSO_4$ are analysed in a newly tailored simple model of the static soliton in the periodically modulated phases of the one-dimensional compressible Ising model. It is shown that the original hcp symmetry is crucial for understanding of the anomalous temperature-dependence of the Brillouin shift.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1108-1110
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Intersubband Plasmon Polaritons in Multiple Quantum Well Structures
Autorzy:
Ziętkowski, W.
Załużny, M.
Powiązania:
https://bibliotekanauki.pl/articles/2028845.pdf
Data publikacji:
2001-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.66.Fd
73.20.Mf
71.36.+c
Opis:
Radiative intersubband plasmon polaritons in multiple quantum well structures, with arbitrary number of quantum wells, are discussed theoretically. The dispersion relations are derived modeling multiple quantum well structure by uniform uniaxial effective medium and using a full set of the Maxwell equations for macroscopic (local) electromagnetic fields. Numerical calculations are performed for a "GaAs-GaAs/AlGaAs multiple quantum well-air" structure corresponding to a typical total internal reflection geometry. Manifestation of these modes in total internal reflection spectra is also considered.
Źródło:
Acta Physica Polonica A; 2001, 100, 3; 425-430
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Examples for the Industrial Use of Synchrotron Radiation
Autorzy:
Hormes, J.
Chauvistré, R.
Schmitt, W.
Pantelouris, M.
Powiązania:
https://bibliotekanauki.pl/articles/1920823.pdf
Data publikacji:
1992-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.85.+n
29.20.-c
32.30.Rj
78.70.Dm
Opis:
Synchrotron radiation has become a valuable tool for many fields of basic research. Several of the methods which were here developed are also suitable for solving industrial problems. Perhaps the most promising ones are the various X-ray techniques, e.g. X-ray absorption spectroscopy (EXAFS and XANES) and X-ray fluorescence. In the following article the theoretical and experimental basis for these techniques is shortly introduced and some instructive examples for such applications for actual industrial problems are dicussed. In the last section, X-ray lithography for the production of microstructures is presented as an example where synchrotron radiation is already today used for industrial production.
Źródło:
Acta Physica Polonica A; 1992, 82, 1; 37-50
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Study of Vibrational Spectra of Fullerene $C_{70}$ and~$C_{80}$: An Algebraic Approach
Autorzy:
Sen, R.
Kalyan, A.
Subhra Paul, R.
Sarkar, N.
Bhattacharjee, R.
Powiązania:
https://bibliotekanauki.pl/articles/1493408.pdf
Data publikacji:
2011-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.65.Fd
07.57.-c
02.20.Sv
78.30.Na
Opis:
Using the Lie algebraic method, the stretching vibrational energies of fullerenes $C_{70}$ and $C_{80}$ are calculated in the one-dimensional U(2) framework. By constructing the model Hamiltonian with the help of Casimir and Majorana invariant operators in this frame work, we calculated the local mode vibrational energy levels of the fullerenes $C_{70}$ and $C_{80}$.
Źródło:
Acta Physica Polonica A; 2011, 120, 3; 407-411
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectroscopic Studies on Distorted Structure Nanomolecules by Using Lie Algebraic Model
Autorzy:
Rao Karumuri, S.
Girija Sravani, K.
Vijayshekar, J.
Reddy, L.
Powiązania:
https://bibliotekanauki.pl/articles/1419693.pdf
Data publikacji:
2012-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.65.Fd
07.57.-c
02.20.Sv
78.30.Na
Opis:
We have applied Lie algebraic model to distorted structure molecules to determine the vibrational spectra of different stretching and bending vibrational modes. The the Lie algebraic model of the Hamiltonian expression is H = $E_0 + \sum_{i = 1}^{n} A_{i} C_{i} + \sum_{i < j}^{n} A_{ij} C_{ij} + \sum_{i < j}^{n} \lambda_{ij} M_{ij}$. By using the Lie algebraic method, the stretching vibrational energies of fullerene $(C_{80})$ are calculated in the one-dimensional [U(2)] framework. Using the model Hamiltonian so constructed, we have calculated the local mode vibrational energy levels of the fullerene $(C_{80})$ accurately.
Źródło:
Acta Physica Polonica A; 2012, 122, 1; 49-52
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Motional Enhancement of Exciton Magnetic Moments
Autorzy:
Litvinov, A.
Kochereshko, V.
Cox, R. T.
Besombes, L.
Mariette, H.
Boukari, H.
Loginov, D.
Davies, J. J.
Smith, L. C.
Wolverson, D.
Powiązania:
https://bibliotekanauki.pl/articles/2047370.pdf
Data publikacji:
2007-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.35.Cc
71.35.Ji
71.36.+c
78.20.Ls
Opis:
The phenomenon in which giant enhancement of exciton magnetic moments occurs due to translational motion was found for light hole excitons in ZnTe/ZnMgTe quantum well structures. Decreasing diamagnetic shifts as the number of the exciton quantized state increases were found for the first time.
Źródło:
Acta Physica Polonica A; 2007, 112, 2; 161-165
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transmission Spectra of Thue-Morse Multilayers Containing Negative Index Metamaterials
Autorzy:
Maksimovic, M.
Jaksic, Z.
Powiązania:
https://bibliotekanauki.pl/articles/2047879.pdf
Data publikacji:
2007-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.Qs
71.36.+c
71.55.Jv
78.20.Ci
Opis:
We study the optical transmission spectra in one-dimensional aperiodic Thue-Morse multilayers composed from alternating layers of media with positive and negative refractive index. We examine the influence of phase compensation on the spectral transmission for both on-axis and off-axis wave propagation. The origin of the transmission resonances and their relation with the field localization are analyzed. Nondispersive and lossless, as well as realistic dispersive and weakly lossy materials are considered.
Źródło:
Acta Physica Polonica A; 2007, 112, 5; 1049-1054
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Field Induced Redistribution of Exciton-Polariton Density on Confined Modes
Autorzy:
Piętka, B.
Szczytko, J.
Łusakowski, J.
Nardin, G.
Léger, Y.
Morier-Genoud, F.
Deveaud-Plédran, B.
Powiązania:
https://bibliotekanauki.pl/articles/1409612.pdf
Data publikacji:
2012-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.36.+c
42.55.Sa
71.35.-y
71.35.Ji
78.20.Ls
Opis:
The influence of magnetic field on confined exciton-polariton modes inside a semiconductor microcavity is discussed. The three-dimensional confinement for exciton-polaritons is achieved by the mesa structures confining the photonic part of polaritons. We observe a strong increase of the polariton emission intensity and we argue that this effect is due to the change of the oscillator strength of the excitonic component of polaritons and the change of the excitonic content in polariton state as the magnetic field increases.
Źródło:
Acta Physica Polonica A; 2012, 122, 6; 1093-1095
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 16

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