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Wyszukujesz frazę "E.L." wg kryterium: Autor


Tytuł:
Determination of Submonolayer Coverages Using Auger Escape Depths
Autorzy:
Godowski, P. J.
Hardegree, E. L.
Powiązania:
https://bibliotekanauki.pl/articles/1931323.pdf
Data publikacji:
1994-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
79.20.Fv
68.10.Jy
82.65.My
Opis:
A simple method for determining submonolayer adsorbate coverages by means of Auger electron spectroscopy is presented. The procedure is based on the ratio of low to high kinetic energy Auger signals from the substrate alone, therefore it does not require a direct measurement of adsorbate peaks. It may be of special interest in cases where the adsorbate signal is difficult or impossible to measure, as well as when adsorbate and substrate peaks overlap or when peaks are absent (H or He) or of low intensity. The method is tested by quantification of sulphur layer on the Ni(001) and on the polycrystalline iron surface.
Źródło:
Acta Physica Polonica A; 1994, 85, 5; 843-848
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exchange Splitting of Zero-Dimensional Exciton Levels
Autorzy:
Goupalov, S. V.
Ivchenko, E. L.
Powiązania:
https://bibliotekanauki.pl/articles/1969097.pdf
Data publikacji:
1998-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.70.Gm
73.20.Dx
78.66.-w
Opis:
A theory of nonanalytic (long-range) exchange interaction between an electron and a hole is developed for zero-dimensional excitons in semiconductor nanostructures. Two particular cases are considered in detail: (i) that of exciton confined in a spherical nanocrystal and (ii) a quantum-well exciton localized as a whole on an anisotropic island of well-width monolayer fluctuation.
Źródło:
Acta Physica Polonica A; 1998, 94, 2; 341-346
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Point Contact Studies of High T$\text{}_{c}$ Superconductors
Autorzy:
Susła, B.
Meepagala, S. C.
Wolf, E. L.
Powiązania:
https://bibliotekanauki.pl/articles/1929570.pdf
Data publikacji:
1993-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.50.+r
74.70.Tx
Opis:
Point contact spectroscopy experiments were performed on both single crystals Bi$\text{}_{2}$Sr$\text{}_{2}$CaCu$\text{}_{2}$O$\text{}_{8+y}$ and BiSrCaCuO/Ag sintered material using gold tips. The spectra exhibit tunneling structure, which are interpreted in terms of the energy gap structure 2Δ = 58 meV at 4.2 K. We observed the strong Andreev reflection of the Au-BiSrCaCuO/Ag boundary.
Źródło:
Acta Physica Polonica A; 1993, 84, 2; 315-319
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Periodic Behavior of the Exciton Oscillator Strength with AlAs Thickness in Type II GaAs AlAs Heterostructures
Autorzy:
Gourdon, C.
Martins, D.
Lavallard, P.
Ivchenko, E. L.
Powiązania:
https://bibliotekanauki.pl/articles/2028741.pdf
Data publikacji:
2001-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.66.-w
71.70.-d
Opis:
For a single GaAs/AlAs/GaAs type II pseudodirect double quantum well, as well as for superlattices it was predicted that the oscillator strength of the lowest optical transition has a periodic dependence on the number of AlAs monolayers. The oscillator strength depends on the coupling between theΓ and X electron states. We use samples containing a single GaAs/AlAs/GaAs double quantum well with thickness gradient to show experimental evidence of this effect. The results concerning theΓ-X coupling are obtained from the study of the ratio of photoluminescence intensities of the zero-phonon line and the phonon replica and from their time decay. They show the monolayer dependence of the Γ-X mixing potential. We extend the model describing the Γ-X coupling for ideal interfaces in the frame of the envelope approximation to the case of non-abrupt interfaces and exciton localization. The amplitude of variation of the radiative recombination time due to the Γ-X mixing is well reproduced within this model.
Źródło:
Acta Physica Polonica A; 2001, 100, 3; 409-416
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectroscopy of 2-aminopurine: An MCSCF Study
Autorzy:
Rachofsky, E. L.
Ross, J. B. A.
Krauss, M.
Osman, R.
Powiązania:
https://bibliotekanauki.pl/articles/1992724.pdf
Data publikacji:
1998-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
31.15.Ar
31.50.+w
33.20.Lg
33.50.Dq
Opis:
2-aminopurine is a highly fluorescent isomer of adenine that can be incorporated into DNA as a probe of structure, dynamics, and protein-DNA interactions. Interpretation of the fluorescence of 2-aminopurine in DNA requires a model of the electronic structure of this fluorophore in its ground and excited states. To this end, electronic structures and energies of the ground and lowest singlet excited states of 2-amino-9-methylpurine were calculated by the multiconfiguration self-consistent field method supplemented by multiconfiguration perturbation theory. The molecular geometry was optimized in both of these electronic states to permit investigation of both electronic excitation and fluorescence emission. The predicted energies and transition dipoles were in good agreement with experiment. The permanent molecular dipole of 2-amino-9-methylpurine increased upon excitation, suggesting that both the absorption and emission spectra should shift to slightly lower energies in polar solvents. The anomalous spectral shifts observed in water suggest that 2-aminopurine undergoes hydrogen bonding that better stabilizes the ground state than the excited state. From the calculated electrostatic potentials of these two states, the position at which this hydrogen bond forms was predicted. These results form a basis for understanding the excited states and possible intermolecular interactions of 2-aminopurine in DNA.
Źródło:
Acta Physica Polonica A; 1998, 94, 5-6; 735-748
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Raman Study in Pr$\text{}_{0.5}$Ca$\text{}_{0.5}$MnO$\text{}_{3}$ Thin Films
Autorzy:
Tatsi, A.
Papadopoulou, E. L.
Lampakis, D.
Liarokapis, E.
Prellier, W.
Mercey, B.
Powiązania:
https://bibliotekanauki.pl/articles/2037101.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.47.Gk
78.30.-j
63.20.-e
Opis:
We report novel Raman measurements made on Pr$\text{}_{0.5}$Ca$\text{}_{0.5}$MnO$\text{}_{3}$ thin films grown on SrTiO$\text{}_{3}$ and LaAlO$\text{}_{3}$ (PCMO/STO and PCMO/LAO, respectively). The measurements were performed for a temperature range 78 K
Źródło:
Acta Physica Polonica A; 2004, 105, 1-2; 99-106
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Anisotropy of ZnSe/BeTe Superlattices Probed by Excitonic Spectroscopy
Autorzy:
Platonov, A. V.
Kochereshko, V. P.
Ivchenko, E. L.
Yakovlev, D.
Ossau, W.
Fischer, F.
Waag, A.
Landwehr, G.
Powiązania:
https://bibliotekanauki.pl/articles/1992063.pdf
Data publikacji:
1998-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Et
78.66.-w
78.66.Hf
Opis:
Photoluminescence spectra of type-II ZnSe/BeTe superlattices were studied. A linear polarised photoluminescence has been found in the spectral range of spatially indirect exciton transitions. This observation is interpreted in a model of optical anisotropy of heterostructures with no-common atom at interfaces.
Źródło:
Acta Physica Polonica A; 1998, 94, 3; 479-482
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gd$\text{}^{3+}$ Spin-Phonon Interactions in Rare-Earth Fluoride Crystals
Autorzy:
Paradowski, M. L.
Misiak, L. E.
Powiązania:
https://bibliotekanauki.pl/articles/2035540.pdf
Data publikacji:
2002-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
63.20.Kr
76.30.Kg
Opis:
The X-band EPR study of Gd$\text{}^{3+}$-doped LaF$\text{}_{3}$, La$\text{}_{0.9}$Ce$\text{}_{0.1}$F$\text{}_{3}$, La$\text{}_{0.9}$Nd$\text{}_{0.1}$F$\text{}_{ }$3, LiYF$\text{}_{4}$ and LiY$\text{}_{0.9}$Yb$\text{}_{0.1}$F$\text{}_{4}$ single crystals in the temperature range 4.2-295 K was carried out in order to investigate the Gd$\text{}^{3+}$ spin-phonon interactions. Spin-Hamiltonian parameters are analysed in the light of the superposition model and the rotational invariance theory for phonon-induced contributions to spin-Hamiltonian parameters. The 4f$\text{}^{7}$ electron-phonon interactions can be described by the Debye model. It is suggested, from the rotational invariance mechanism for phonon-induced contributions to spin-Hamiltonian parameters, that the rotational contributions are much smaller than those from the strain. Temperature-induced distortions of the crystal field, as well as these distortions caused by the La$\text{}^{3+}$/Nd$\text{}^{3+}$ and Y$\text{}^{3+}$/Yb$\text{}^{3+}$ substitutions, influence significantly the 4f$\text{}^{7}$ electron-phonon interactions. The coupling constant K$\text{}_{2}$ of 4f$\text{}^{7}$ electrons to the whole phonon spectrum of the crystal lattice is stronger in the LaF$\text{}_{3}$, La$\text{}_{0.9}$Ce$\text{}_{0.1}$F$\text{}_{3}$, La$\text{}_{0.9}$Nd$\text{}_{0.1}$F$\text{}_{3}$ with larger temperature-induced distortion of the Gd$\text{}^{3+}$ site symmetry than in LiYF$\text{}_{4}$, LiY$\text{}_{0.9}$Yb$\text{}_{0.1}$F$\text{}_{4}$. Our results are compared with those for Gd$\text{}^{3+}$-doped RbCdF$\text{}_{3}$ and PbF$\text{}_{2}$ single crystals.
Źródło:
Acta Physica Polonica A; 2002, 102, 3; 373-384
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gd$\text{}^{3+}$-RE$\text{}^{3+}$ Exchange Interactions in Rare-Earth Fluoride Crystals (RE = Ce, Nd, Yb)
Autorzy:
Paradowski, M. L.
Misiak, L. E.
Powiązania:
https://bibliotekanauki.pl/articles/2037294.pdf
Data publikacji:
2004-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
63.20.Kr
75.30.Et
75.30.Hx
76.30.Kg
Opis:
The investigation of Gd$\text{}^{3+}$-doped LaF$\text{}_{3}$, La$\text{}_{0.9}$Ce$\text{}_{0.1}$F$\text{}_{3}$, CeF$\text{}_{3}$, La$\text{}_{0.9}$Nd$\text{}_{0.1}$F$\text{}_{3}$, LiYF$\text{}_{4}$, and LiY$\text{}_{0.9}$Yb$\text{}_{0.1}$F$\text{}_{4}$ single crystals at 4.2 K was carried out in order to study the Gd$\text{}^{3+}$-RE$\text{}^{3+}$ exchange interactions (RE = Ce, Nd, Yb). The exchange interactions were estimated by the application of the molecular-field model at liquid-helium temperature, using the g shift from the isostructural diamagnetic hosts LaF$\text{}_{3}$ and LiYF$\text{}_{4}$ to the paramagnetic hosts. The lattice dynamics is studied by analysing spin-Hamiltonian parameters in the light of the superposition model and the rotational invariance theory for phonon-induced contributions to spin-Hamiltonian parameters. It is suggested from the rotational invariance mechanism for phonon-induced contributions to spin-Hamiltonian parameters that the rotational contributions influence the exchange interactions significantly. Further, the distortions caused by the La$\text{}^{3+}$/Ce$\text{}^{3+}$, La$\text{}^{3+}$/Nd$\text{}^{3+}$, and Y$\text{}^{3+}$/Yb$\text{}^{3+}$ substitutions affect significantly the 4f$\text{}^{7}$ electron-phonon interactions, as well as the exchange interactions. The magnitude of the isotropic exchange interactions is larger for more symmetrical charge distribution of the 4f$\text{}^{7}$ shell.
Źródło:
Acta Physica Polonica A; 2004, 105, 5; 445-457
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
EPR of Gd$\text{}^{3+}$-Doped La$\text{}_{0.9}$Nd$\text{}_{0.1}$F$\text{}_{3}$ Crystal: Spin-Phonon Interactions and Spin-Lattice Relaxations
Autorzy:
Paradowski, M. L.
Misiak, L. E.
Powiązania:
https://bibliotekanauki.pl/articles/1995695.pdf
Data publikacji:
1999-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.Kg
Opis:
The X-band EPR study of Gd$\text{}^{3+}$-doped La$\text{}_{0.9}$Nd$\text{}_{0.1}$F$\text{}_{3}$ single crystal in the temperature range 4.2-295 K is carried out in order to investigate crystal field effects, the Gd$\text{}^{3+}$ spin-phonon interactions, as well as Gd$\text{}^{3+}$ and Nd$\text{}^{3+}$ spin-lattice relaxation times. The local distortions at 4.2 K of the positions of the eight F$\text{}^{-}$ ions surrounding the Gd$\text{}^{3+}$ ion in the La$\text{}_{0.9}$Nd$\text{}_{0.1}$F$\text{}_{3}$ crystal were determined from comparison of the theoretical with the experimental spin-Hamiltonian parameters. The spin-phonon interactions can be described by the Einstein model, which better characterizes the behavior of paramagnetic centers in LaF$\text{}_{3}$ and La$\text{}_{0.9}$Nd$\text{}_{0.1}$F$\text{}_{3}$ crystals than the Debye model. It is suggested, from the rotational invariance mechanism for phonon-induced contributions to spin-Hamiltonian parameters, that the rotational contributions are much smaller than those from the strain.
Źródło:
Acta Physica Polonica A; 1999, 95, 3; 367-380
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diffusion Length Studies in CdMnTe by the Surface Photovoltage Method
Autorzy:
Płaczek-Popko, E.
Szaro, L.
Jędral, L.
Powiązania:
https://bibliotekanauki.pl/articles/1879853.pdf
Data publikacji:
1991-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.40.+w
Opis:
The surface phototovoltage method provides a nondestructive means of measuring minority carriers diffusion length and is suitable for process control applications and for material acceptance tests. Application of the method in the case of CdMnTe compounds has been studied in the present paper. The optimum measurement conditions have been investigated by studying the dependence of measured diffusion length on the experimental conditions. As the surface photovoltage method requires the exact values of absorption coefficient as a function of wavelength, α = f(λ), the dependence has been determined. The minority carrier diffusion length for the sample investigated has been found to be equal to several tenth of μm.
Źródło:
Acta Physica Polonica A; 1991, 79, 2-3; 187-190
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
AC Susceptibility of the $YBa_2Cu_3O_7$ Coated Conductor in High Magnetic Fields
Autorzy:
Seiler, E.
Frolek, L.
Powiązania:
https://bibliotekanauki.pl/articles/1813703.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
84.71.Mn
Opis:
The AC susceptibility of the $YBa_2Cu_3O_7$ coated conductor in the perpendicular applied AC magnetic field was investigated using an inductive experimental setup with a pair of coils connected in opposite. A harmonic homogeneous AC magnetic field was applied perpendicularly to the wide face of the $YBa_2Cu_3O_7$ coated tape. Together with this AC field, a parallel background DC magnetic field up to 14 T was applied perpendicularly to the tape. The measurements were performed at several constant temperatures in the range 3-50 K. In the region of high background DC fields (8-14 T) no influence of the tape's ferromagnetic substrate was detected, despite of the low measurement temperatures employed. The estimate of the critical current density $(j_c)$ at 20 K and 14 T, based on the position of the imaginary AC susceptibility peak, gives the value $j_c$=0.53 MA/$cm^2$.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 379-382
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methods of non-extensive statistical physics in analysis of price returns on Polish stock market
Autorzy:
Bil, Ł.
Grech, D.
Podhajska, E.
Powiązania:
https://bibliotekanauki.pl/articles/1075477.pdf
Data publikacji:
2016-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.45.Tp
89.75.Da
89.65.Gh
89.75.-k
Opis:
We use methods of non-extensive statistical physics to describe quantitatively the memory effect involved in returns of companies from WIG 30 index on the Warsaw Stock Exchange. The entropic approach based on the generalization of the Boltzmann-Gibbs entropy to non-additive Tsallis q-entropy is applied to fit fat tailed distribution of returns to q-normal (Tsallis) distribution. The existence of long term memory effects in price returns generated by two-point autocorrelations are checked via calculation of the Hurst exponent within detrended fluctuation analysis approach. The results are collected for diversified frequency of data sampling. We confirm the perfect inverse cubic power law for low time-lags (≈1 min) of returns for the main WIG 30 index as well as for the most of separate stocks, however this relationship does not hold for longer time-lags. The particular emphasis is given to a study of an independent fit of probability distribution of positive and negative returns to q-normal distribution. We discuss in this context the asymmetry between tails in terms of the Tsallis parameters q^{±}. A qualitative and quantitative relationship between the frequency of data sampling, the parameters q and q^{±}, and the corresponding main Hurst exponent H is provided to analyze the effect of memory in data caused by linear and nonlinear autocorrelations. A new quantifier based on asymmetry of the Tsallis index instead of skewness of distribution is proposed which we believe is able to describe the stage of market development and its robustness to speculation.
Źródło:
Acta Physica Polonica A; 2016, 129, 5; 986-992
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fragmentation and Kinetic Energy Release of Ions Produced from $C_2H_5OH$
Autorzy:
Szot, E.
Głuch, K.
Wójcik, L.
Powiązania:
https://bibliotekanauki.pl/articles/1400424.pdf
Data publikacji:
2013-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.75.+h
34.80.Ht
33.15.Fm
34.80.Gs
Opis:
The high resolution double focusing mass spectrometer of reversed Nier-Johnson geometry was used in research of ionization and fragmentation processes of ethanol molecules $C_2H_5OH$. Using the mass-analyzed ion kinetic energy technique, fragmentation paths and kinetic energy release distributions were examined for the four fragmentation reactions: $C_2H_6O^{+} \rightarrow C_2H_5O^{+},$ $C_2H_6O^{+} \rightarrow C_2H_3O^{+},$ $CH_3O^{+} \rightarrow CH_2O^{+}$ and $CH_3O^{+} \rightarrow CHO^{+}$. For all fragment ions from these reactions mean values of kinetic energy release 〈ε〉 were determined. We calculated mean values of 〈ε〉 as 22.70 meV, 62.15 meV, 30.25 meV, and 117.20 meV for $C_2H_5O^{+},$ $C_2H_3O^{+},$ $CH_2O^{+},$ and for $CHO^{+}$ ions, respectively.
Źródło:
Acta Physica Polonica A; 2013, 123, 5; 797-799
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mass Spectrometric Study of Positive Ion-Molecule Reactions in the $C_{3}H_{6}$ and Ar Mixtures Inside the High Pressure Ion Source
Autorzy:
Markowski, A.
Szot, E.
Wójcik, L.
Powiązania:
https://bibliotekanauki.pl/articles/1400475.pdf
Data publikacji:
2013-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.30.Fi
07.75.+h
07.81.+a
92.60.Sz
Opis:
Ion-molecule reactions have been measured for the propene-argon mixtures of different compositions using a quadrupole mass spectrometer with a high-pressure ion source. The concentration of propane in these mixtures ranged from 10% to 90% (at 10% increment). The following primary and secondary ions: $CH_{5}^{+}$ (m/q=17), $C_{2}H_{2}^{+}$ (m/q=26), $C_{2}H_{3}^{+}$ (m/q=27), $C_{2}H_{4}^{+}$ (m/q=28), $C_{2}H_{5}^{+}$ (m/q=29), $C_{3}H_{3}^{+}//\text{}^{39}Ar^{+}$ (m/q=39), $C_{3}H_{4}^{+}//\text{}^{40}Ar^{+}$ (m/q=40), $C_{3}H_{5}^{+}$ (m/q=41), $C_{3}H_{6}^{+}//\text{}^{42}Ar^{+}$ (m/q=42), $C_{3}H_{7}^{+}$ (m/q=43), $C_{3}H_{8}^{+}$ (m/q=44), $C_{4}H_{5}^{+}$ (m/q=53), $C_{4}H_{6}^{+}$ (m/q=54), $C_{4}H_{7}^{+}$ (m/q=55), $C_{4}H_{8}^{+}$ (m/q=56), $C_{4}H_{9}^{+}$ (m/q=57), $C_{5}H_{5}^{+}$ (m/q=65), $C_{5}H_{6}^{+}$ (m/q=66), $C_{5}H_{7}^{+}$ (m/q=67), $C_{5}H_{8}^{+}$ (m/q=68), $C_{5}H_{9}^{+}$ (m/q=69), $C_{5}H_{10}^{+}$ (m/q=70) were observed. Relative ion current intensities for primary and secondary ions are presented as a function of both total mixtures pressure and concentration of propene in the mixture. Primary ions were produced by electrons with the energy of 300 eV. The potential of repeller electrode $V_{R}$ inside the ion source collision chamber was fixed at 5 V for all measurements. The total mixture pressure was changed from 0.7 to 26.6 Pa. Schemes of ion-molecule reactions were proposed.
Źródło:
Acta Physica Polonica A; 2013, 123, 5; 911-915
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł

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