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Tytuł:
Test Measurements of Modernized Version of Two-Detector Doppler Spectrometer
Autorzy:
Baranowski, A.
Kostrzewa, M.
Szuszkiewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/2007881.pdf
Data publikacji:
1999-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
07.85.-m
Opis:
Basing on the electronic analogue modules in adding and subtracting branches of pulses, a modernized two-detector Doppler spectrometer has been constructed using only one multichannel analyser. Doppler spectra for Al, Ni, Ag have been measured. ACARFIT computer program was used to compare the Doppler and angular correlation of annihilation radiation results.
Źródło:
Acta Physica Polonica A; 1999, 95, 4; 439-447
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studying of Nickel Alloys with 1 at.% of Ge, Zn, In, Zr and Pb by Positron Annihilation Methods
Autorzy:
Baranowski, A.
Kostrzewa, M.
Szuszkiewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/2024150.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
78.30.Er
Opis:
The measurements of cold rolled nickel alloys with 1 at.% of Ge, Zn, In, Zr, Pb and additionally Ti and Sb by positron lifetime and Doppler broadening techniques have been done. Monovacancies were a dominating type of defects in the alloys. The authors of the present paper connect the differences between the annihilation parameters of the investigated samples with the existence of the vacancy-impurity atom pairs. A direct proportionality between the vacancy lifetime and the product of vacancy-impurity binding energy and atomic radius of impurity atom has been found.
Źródło:
Acta Physica Polonica A; 2001, 99, 3-4; 329-336
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positron Annihilation with Electrons of Admixture Atoms in Some Binary Nickel Alloys
Autorzy:
Baranowski, A.
Kostrzewa, M.
Szuszkiewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/2042168.pdf
Data publikacji:
2005-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
78.30.Er
Opis:
Weighted difference curves have been shortly presented as a proper tool allowing to analyze in another way two-detector Doppler spectra regarding positron annihilation with admixture electrons in some nickel alloys. The analysis of low and middle momentum parts of Doppler spectra for investigated alloys reflects the annihilation of positrons with admixture electrons. There is no distinct signal of annihilations with admixture electrons from the positron lifetime data for well-annealed samples.
Źródło:
Acta Physica Polonica A; 2005, 107, 4; 570-575
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of the Absorption of Annihilation Quanta in Solid and Liquid Ga and BiSn Alloy
Autorzy:
Kluza, A.
Rudzińska, W.
Szuszkiewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/2025123.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.70.Dv
Opis:
Absorption of positron annihilation quanta in Ga and Bi$\text{}_{40}$Sn$\text{}_{60}$ alloy in the solid and the liquid phase was investigated. It was found that the mechanism of absorption of annihilation quanta changes on passing from the solid to the liquid state. Results of measurements for Ga and Bi$\text{}_{40}$Sn$\text{}_{60}$ alloy show that for metals changing their density at the melting point the photopeak profiles are modified: their centers of gravity in liquid phase are displaced with respect to those in the solid phase and the number of counts under the photopeak changes, too.
Źródło:
Acta Physica Polonica A; 2001, 99, 3-4; 407-413
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positron Lifetime in Hostaphan
Autorzy:
Kostrzewa, M.
Bujnarowski, G.
Kluza, A. A.
Szuszkiewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/2047137.pdf
Data publikacji:
2006-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
71.60.+z
61.41.+e
Opis:
Positron lifetime measurements in hostaphan RNK, used for encapsulation of $\text{}^{22}$Na positron sources, were performed. It was found that the parameter of positron lifetime spectra in hostaphan RNK differ markedly from those for other forms of polyethylene terephthalate. The maximum penetration depth of positrons from RNK hostaphan amounts 0.42 mm. The information gained in the present study is of great importance for experimenters using hostaphan RNK for encapsulation of positron sources.
Źródło:
Acta Physica Polonica A; 2006, 110, 5; 615-620
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positron Annihilation in Steel Samples Deformed by Uniaxial Tension
Autorzy:
Rudzińska, W.
Szuszkiewicz, M.
Bujnarowski, G.
Kluza, A.
Powiązania:
https://bibliotekanauki.pl/articles/1812548.pdf
Data publikacji:
2008-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
Opis:
Angular distributions of the positron annihilation quanta were measured for steel ST2 SAL samples deformed by uniaxial tension up to different deformation degrees. The dependences of the S parameter on the relative elongation of the samples are presented. The positron annihilation data for steel are compared with the results obtained previously for polycrystalline iron samples deformed by uniaxial tension up to different deformation degrees in the proportionality and limited proportionality regions.
Źródło:
Acta Physica Polonica A; 2008, 113, 5; 1507-1510
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positron Annihilation in Polycrystalline Metals Deformed by Uniaxial Tension
Autorzy:
Rudzińska, W.
Pająk, J.
Szuszkiewicz, M.
Bujnarowski, G.
Kluza, A. A.
Powiązania:
https://bibliotekanauki.pl/articles/2043362.pdf
Data publikacji:
2005-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
Opis:
Angular distributions of the positron annihilation quanta were measured for polycrystalline samples deformed by uniaxial tension up to different deformation degrees. The S parameter as a function of the W parameter was determined. The data obtained for samples elongated up to different elongation degrees indicate that in the proportionality and limited proportionality regions the changes in the physical properties of samples are governed mainly by generation of vacancies and formation and kinetics of transformations of vacancy clusters occurring first of all on the grains of monocrystallites. In the region of plastic deformations the dominant defects are dislocations and vacancies and their aggregates generated due to the formation and movement of the dislocation of the primary and secondary slip. The positron annihilation data are corroborated by the results of the resistometric and tensometric measurements in the proportionality and limited proportionality regions.
Źródło:
Acta Physica Polonica A; 2005, 107, 5; 857-863
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positron Annihilation in Metals Defected by Action of the Tensile Force
Autorzy:
Rudzińska, W.
Pająk, J.
Szuszkiewicz, M.
Bujnarowski, G.
Kluza, A. A.
Powiązania:
https://bibliotekanauki.pl/articles/2047160.pdf
Data publikacji:
2006-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
Opis:
Results of experimental investigations of uniaxially elongated mono- and polycrystalline samples of several metals (Fe, Ta, Pd, Ag, and Au), performed using the positron annihilation methods, are reviewed. The dependences of the S-parameters and positron lifetimes on the relative elongation of the samples were presented. The data obtained for polycrystalline samples indicate that in the proportionality and limited proportionality regions the changes in the physical properties are governed mainly by generation of vacancies and by kinetics of formation and transformations of vacancy clusters occurring first of all on the grain boundaries of monocrystallites. In the region of plastic deformations the dominant defects are dislocations and vacancies and their aggregates generated due to the formation and movement of the dislocations of the primary and secondary slip. In the case of monocrystalline samples it was found that the dynamics of the dislocations and vacancy generation during the sliding of some crystallographic planes depends on the crystallographic direction.
Źródło:
Acta Physica Polonica A; 2006, 110, 5; 691-699
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reflectivity Study of Hg$\text{}_{1-x}$Co$\text{}_{x}$Se Crystals
Autorzy:
Guziewicz, E.
Kowalski, B. J.
Orłowski, B. A.
Szuszkiewicz, W.
Powiązania:
https://bibliotekanauki.pl/articles/1931782.pdf
Data publikacji:
1994-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Fi
Opis:
The reflectivity spectra of Hg$\text{}_{1-x}$Co$\text{}_{x}$Se (x = 0.0, 0.024, 0.031) crystals were measured in the vacuum ultraviolet photon energy range from 4 to 12 eV to find the influence of Co ions on the valence band electronic structure of the HgSe crystal. The structure of the reflectivity spectra was interpreted in terms of the electronic band structure of the binary material (HgSe) assuming direct allowed interband transitions.
Źródło:
Acta Physica Polonica A; 1994, 86, 5; 875-878
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Dynamic Dielectric Function "Anomaly" for HgSe:Ga and HgSe:Fe
Autorzy:
Szuszkiewicz, W.
Karczewski, G.
Jeżewski, M.
Witkowska, B.
Mycielski, A.
Powiązania:
https://bibliotekanauki.pl/articles/1887004.pdf
Data publikacji:
1991-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Pp
78.20.Ci
78.30.Fs
Opis:
Reflectivity spectra of HgSe crystals highly doped with Ga and Fe, respectively, were investigated in the spectral region close to the absorption edge at temperatures between 12 K and 295 K. From the analysis of the structure observed in reflectivity the temperature dependence of the Fermi energy was determined for both kinds of crystals.
Źródło:
Acta Physica Polonica A; 1991, 79, 2-3; 369-372
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Iron Impurity Related Optical Transitions in HgSe:Fe
Autorzy:
Szuszkiewicz, W.
Julien, C.
Balkanski, M.
Arciszewska, M.
Witkowska, B.
Mycielski, A.
Powiązania:
https://bibliotekanauki.pl/articles/1891323.pdf
Data publikacji:
1991-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Fr
71.70.-d
78.50.Ge
Opis:
Fe$\text{}^{2+}$ crystal field transitions and the heavy hole valence band to the Fe level transitions (e + Fe$\text{}^{3+}$ → Fe$\text{}^{2+}$) have been observed and discussed for HgSe doped with iron.
Źródło:
Acta Physica Polonica A; 1991, 80, 3; 437-440
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microhardness and the Young Modulus of Thin, MBE-Grown, (Sn,Mn)Te Layers Containing up to 8% of Mn
Autorzy:
Adamiak, S.
Zięba, M.
Minikayev, R.
Reszka, A.
Taliashvili, B.
Szuszkiewicz, W.
Powiązania:
https://bibliotekanauki.pl/articles/1033220.pdf
Data publikacji:
2017-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.de
62.20.Qp
68.60.Bs
Opis:
The thin layers of (Sn,Mn)Te solid solution were grown by molecular beam epitaxy onto (111)-oriented BaF₂ substrates and characterized by scanning electron microscopy, atomic force microscopy, energy dispersive X-ray spectrometry, and X-ray diffraction methods. The epitaxial character of the growth was confirmed. All the layers exhibited a regular (fcc) structure of the rock-salt type and were (111)-oriented, their thickness was close to about 1 μm. The layers contained up to 8% of Mn. The microhardness and the Young modulus values were determined by the nanoindentation measurements. The Berkovich type of the intender was applied, the maximum applied load was equal to 1 mN. The results of measurements demonstrated a lack of the composition dependence of the Young modulus value. A slight increase of the microhardness value with an increasing Mn content in the (Sn,Mn)Te solid solution was observed.
Źródło:
Acta Physica Polonica A; 2017, 132, 2; 347-350
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Do the Mixed Crystals HgSeS Exhibit the One-Mode Behavior?
Autorzy:
Szuszkiewicz, W.
Witowski, A. M.
Julien, C.
Balkanski, M.
Dybko, K.
Witkowska, B.
Mycielski, A.
Powiązania:
https://bibliotekanauki.pl/articles/1924226.pdf
Data publikacji:
1992-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.20.Ls
78.30.Fs
Opis:
The low-temperature far-infrared reflectivity spectra of HgSe and HgSeS are measured and analysed. The results suggest the one-mode behavior of phonon excitations in HgSeS mixed crystals.
Źródło:
Acta Physica Polonica A; 1992, 82, 5; 887-889
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic Band Structure of Cubic HgS
Autorzy:
Guziewicz, E.
Kowalski, B.
Orłowski, B. A.
Dybko, K.
Witkowska, B.
Szuszkiewicz, W.
Powiązania:
https://bibliotekanauki.pl/articles/1873013.pdf
Data publikacji:
1995-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Fi
Opis:
Reflectivity spectra of Hg$\text{}_{1-x}$Fe$\text{}_{x}$S (x < 0.04) and HgSe$\text{}_{1-y}$S$\text{}_{y}$ (y < 0.5) mixed crystals were measured in the vacuum ultraviolet energy range from 4 to 12 eV. Information about the electronic band structure of cubic modification of HgS resulting from the above data is analyzed and discussed.
Źródło:
Acta Physica Polonica A; 1995, 87, 2; 395-398
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fe 3d Contribution to the Valence Band of Cubic Hg$\text{}_{1-x}$Fe$\text{}_{x}$S - Resonant Photoemission Study
Autorzy:
Kowalski, B. J.
Orłowski, B. A.
Szuszkiewicz, W.
Witkowska, B.
Johnson, R. L.
Powiązania:
https://bibliotekanauki.pl/articles/1933837.pdf
Data publikacji:
1995-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
79.60.-i
Opis:
Resonant photoemission spectra of cubic Ηg$\text{}_{0.94}$Fe$\text{}_{0.06}$S were measured for photon energies near to the energy of intra atomic Fe 3p$\text{}^{6}$3d$\text{}^{6}$ → 3p$\text{}^{5}$3d$\text{}^{7}$ transition. The difference between the spectra taken at resonance and antiresonance is presented as a measure of the energy distribution of Fe 3d derived states. The results obtained show that Fe 3d states contribute to the whole valence band with a distinct structure appearing at the band edge.
Źródło:
Acta Physica Polonica A; 1995, 88, 4; 791-794
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 29

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