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Wyświetlanie 1-15 z 42
Tytuł:
Surface Related Electronic States on CdTe(110) Observed by Means of Optical Spectroscopy
Autorzy:
Kowalski, B. J.
Orłowski, B. A.
Cricenti, A.
Powiązania:
https://bibliotekanauki.pl/articles/1934063.pdf
Data publikacji:
1995-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.20.-r
78.66.Hf
Opis:
Surface differential reflectivity together with photoemission and Auger electron spectroscopies have been applied to observe and identify optical transitions among surface related states on CdTe(110) surfaces. The strongest contributions to the band of optical transitions have been revealed at the photon energies of 2.8, 3.4, and 3.9 eV. Their correspondence to excitations from the occupied S1 band to the unoccupied U1 one at the Γ, Χ and Χ' points of the surface Brillouin zone is discussed.
Źródło:
Acta Physica Polonica A; 1995, 88, 5; 1005-1009
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reflectivity Study of the Zn$\text{}_{1-x}$Co$\text{}_{x}$Se Crystals
Autorzy:
Kowalski, B. J.
Gołacki, Z.
Orłowski, B. A.
Powiązania:
https://bibliotekanauki.pl/articles/1890987.pdf
Data publikacji:
1991-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.20.Ci
Opis:
The room temperature reflectivity spectra of the Zn$\text{}_{1-x}$Co$\text{}_{x}$Se (x = 0, 0.03, 0.05) crystals have been measured in the visible and ultraviolet range from 1.7 to 12 eV. The structure of the spectra was interpreted in terms of the electronic band structure of the binary material (ŻnSe). The experimental results were compared with the reflectivity spectra of the Fe-based semi magnetic semiconductors [1], and the interpretation was confronted with the conclusions derived from the photoemission experiments performed for Cd$\text{}_{1-x}$Co$\text{}_{x}$Se [2] and the tight-binding CPA calculations of the band structure of Zn$\text{}_{1-x}$Co$\text{}_{x}$Se [3].
Źródło:
Acta Physica Polonica A; 1991, 80, 3; 393-396
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bulk Band Structure of CdTe along the Γ-L Direction
Autorzy:
Orłowski, B. A.
Janik, E.
Janowitz, C.
Manzke, R.
Powiązania:
https://bibliotekanauki.pl/articles/1886620.pdf
Data publikacji:
1991-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
79.60.Eq
71.20.Fi
Opis:
The valence band structure E(k) for CdTe (111) Cd side surface 2 x 2 reconstructed was investigated along the Γ-L direction of the bulk Brillouin zone by high-resolution angle-resolved photoemission spectroscopy method in the energy range between 9.5 eV and 30.0 eV. The E(k) dependence was determined as well for bulk as for some of the surface states in the whole width of the valence band. Obtained results are compared with available calculated bulk band structure along Γ-L direction.
Źródło:
Acta Physica Polonica A; 1991, 79, 2-3; 303-306
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reflectivity Study of HgSe$\text{}_{1-x}$Te$\text{}_{x}$ Crystals
Autorzy:
Kowalski, B. J.
Dybko, K.
Lemańska, A.
Orłowski, B. A.
Powiązania:
https://bibliotekanauki.pl/articles/1923860.pdf
Data publikacji:
1992-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.20.Ci
Opis:
The room temperature reflectivity spectra of HgSe$\text{}_{1-x}$Te$\text{}_{x}$ (x = 0, 0.4, 0.5, 1.0) crystals were measured in the visible and ultraviolet range from 1.5 to 12 eV. The maxima characteristic of the binary HgA$\text{}^{IV}$ compounds can be revealed in the mixed crystals spectra, but their position depends on the crystal composition. There is no duplication of the spectral features in spite of the different energy position of the maxima for HgSe and HgTe. This suggests that the virtual crystal approximation could be used to describe basic optical properties of HgSe$\text{}_{1-x}$Te$\text{}_{x}$.
Źródło:
Acta Physica Polonica A; 1992, 82, 5; 845-848
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:
Electronic Structure of Diluted Semimagnetic Semiconductor (Cd,Co)Se
Autorzy:
Cháb, V.
Mašek, J.
Orłowski, B. A.
Kowalski, B. J.
Powiązania:
https://bibliotekanauki.pl/articles/1890829.pdf
Data publikacji:
1991-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.10.Lp
75.50.Pp
79.60.Eq
Opis:
The electronic structure of a new semimagnetic semiconductor (Cd,Co)Se is studied by UPS and calculated by a tight-binding version of the disordered-local-moment theory. The theory accounts for the chemical disorder and for electron interactions within the Co 3d$\text{}^{7}$ shells. Both theory and experiment show Co 3d states deep in the valence band and also at the band edge. The last state seem to be responsible for unique properties of the Co-based semimagnetic semiconductors.
Źródło:
Acta Physica Polonica A; 1991, 80, 3; 333-336
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reflectivity Spectra of Cd$\text{}_{1-x}$Mn$\text{}_{x}$F$\text{}_{2}$ in the 5-35 eV Energy Range
Autorzy:
Francini, R.
Zimnal-Starnawska, M.
Zema, N.
Orłowski, B. A.
Powiązania:
https://bibliotekanauki.pl/articles/1891370.pdf
Data publikacji:
1991-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.40.Ha
Opis:
The reflectivity spectra of Cd$\text{}_{1-x}$Mn$\text{}_{x}$F$\text{}_{2}$ crystals, in the 5-35 eV energy range at 300 and 77 K, were investigated. The observed changes in the shape of spectra, caused by increase of the Mn content, are compared with the calculated band structure of pure CdF$\text{}_{2}$ and with the already available results of XPS experiments for these crystals. The increasing concentration of Mn results in the blurring of the reflectivity structures and shifts the energy of direct exciton (as compared to pure CdF$\text{}_{2}$). Qualitative arguments (hybridization of Mn$\text{}^{2+}$ 3d and F$\text{}^{-}$ 2p states) can describe these effects but a quantitative explanation would require a detailed band structure calculation for these compounds.
Źródło:
Acta Physica Polonica A; 1991, 80, 3; 453-456
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Valence Band Electronic Structure of HgMSe (M=Mn, Fe, Co)
Autorzy:
Guziewicz, A.
Kowalski, B. J.
Orłowski, B. A.
Ghijsen, J.
Johnson, R.
Powiązania:
https://bibliotekanauki.pl/articles/1931745.pdf
Data publikacji:
1994-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
79.60.Eq
71.20.Fi
Opis:
The synchrotron radiation in the energy range between 40 and 80 eV was applied to investigate the electronic structure of Hg$\text{}_{0.7}$Mn$\text{}_{0.3}$Se, Hg$\text{}_{0.88}$Fe$\text{}_{0.12}$Se and Hg$\text{}_{0.93}$Co$\text{}_{0.07}$Se crystals by means of the resonant photoemission spectroscopy. The set of energy distribution curves was measured in the region near the M (M = Mn 3d$\text{}^{5}$, Fe 3d$\text{}^{6}$, Co 3d$\text{}^{7}$) 3p-3d transitions. In order to determine thoroughly the Fano type resonance energy the constant initial states curves were measured.
Źródło:
Acta Physica Polonica A; 1994, 86, 5; 817-823
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:
Analysis of 4f Level in Samarium-Rich MBE Grown CdSmTe Sample
Autorzy:
Szamota-Sadowska, K.
Gołacki, Z.
Orłowski, B. A.
Boyn, R.
Johnson, R. J.
Powiązania:
https://bibliotekanauki.pl/articles/1991645.pdf
Data publikacji:
1998-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.20.At
79.60.-i
79.60.Bm
Opis:
Electronic states of 4f samarium ions were investigated by photoemission spectroscopy in samarium-rich CdSmTe sample obtained by MBE. The photon energy of synchrotron radiation allowed to investigate Fano-type resonance and antiresonance. The energy distribution curve spectra were attributed to the Sm 4d-4f transition. The shape of the constant initial states spectra was compared with this one obtained for atomic samarium.
Źródło:
Acta Physica Polonica A; 1998, 94, 3; 560-564
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Contribution of Mn 3d Electrons To the Valence Band of Sn$\text{}_{0.9}$Mn$\text{}_{0.1}$te
Autorzy:
Nadolny, A. J.
Guziewicz, E.
Kowalski, B. J.
Orłowski, B. A.
Johnson, R.
Powiązania:
https://bibliotekanauki.pl/articles/1992049.pdf
Data publikacji:
1998-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
79.60.-i
71.20.Nr
Opis:
The synchrotron radiation in the energy range between 15 and 70 eV was used to investigate the electronic structure of the crystalline Sn$\text{}_{0.9}$Mn$\text{}_{0.1}$Te by means of the resonant photoemission spectroscopy. Fano-type resonance has been observed in the obtained constant initial energy curves with the resonant energy 50.6 eV and antiresonant energy 49.0 eV. The energy distribution curves taken at photon energies close to the Mn 3p-3d transitions allow us to conclude that Mn atoms contribute to the valence band mainly at energies of 4.0 eV and 7.8 eV below the valence band edge.
Źródło:
Acta Physica Polonica A; 1998, 94, 3; 454-458
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
Tytuł:
Gd 4f and 5d Electrons in Sn$\text{}_{0.96}$Gd$\text{}_{0.04}$Te Valence Band
Autorzy:
Orłowski, B. A.
Kowalski, B. J.
Gołacki, Z.
Story, T.
Johnson, R. L.
Powiązania:
https://bibliotekanauki.pl/articles/1933933.pdf
Data publikacji:
1995-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
79.60.-i
71.20.Fi
Opis:
The synchrotron radiation was applied to measure resonant photoemission spectra (Fano-type Gd 4d-4f resonance), constant initial states and constant final states to study the valence band electronic structure of Sn$\text{}_{0.96}$Gd$\text{}_{0.04}$Te crystal. The resonant energy was found equal to 150.3 eV. The electrons 4f were found to contribute to the valence band of the crystal with the maximum located at 9.5 eV below the valence band edge whereas 5d electrons contribute at the crystal valence band edge.
Źródło:
Acta Physica Polonica A; 1995, 88, 5; 857-860
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Resonant Photoemission Study of Sn$\text{}_{0.96}$Gd$\text{}_{0.04}$Te
Autorzy:
Orlowski, N.
Janowitz, C.
Müller, A.
Manzke, R.
Kowalski, B. J.
Orłowski, B. A.
Powiązania:
https://bibliotekanauki.pl/articles/1963395.pdf
Data publikacji:
1997-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Pp
79.60.-i
Opis:
Sn$\text{}_{0.96}$Gd$\text{}_{0.04}$Te has been studied by means of the resonant photoemission spectroscopy in the constant final states, constant initial states and energy distribution curves modes. In the constant final states spectrum of the well-known giant resonance at the 4d-4f threshold around 150 eV we were able to resolve a peak of the multiplet structure that has not previously been found. Spectra were also taken at the 4p-5d threshold around 280 eV revealing a double structure with antiresonating behaviour.
Źródło:
Acta Physica Polonica A; 1997, 91, 5; 847-850
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cd_{1-x}Fe_{x}Te Ternary Crystal Formation Studied by Resonant Photoemission
Autorzy:
Guziewicz, E.
Kowalski, B. J.
Gołacki, Z.
Orłowski, B. A.
Johnson, R. L.
Masek, J.
Powiązania:
https://bibliotekanauki.pl/articles/1968113.pdf
Data publikacji:
1997-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.35.Fx
79.60.-i
Opis:
A resonant photoemission was used to study the ternary crystal formation, when small amount of Fe atoms was deposited (in one monolayer range of thickness) on the clean CdTe(100) surface. The constant initial state spectra taken near the Fe 3p-3d transition after Fe deposition and then again after heating process show the existence of two Fano-like resonance. The differences of the energy distribution curves taken for both resonance and antiresonance, respectively, allow us to distinguish two kind of Fe 3d contributions to the valence band: one derived from the metallic Fe islands on the surface and the second - derived from the Fe atoms built into the Cd$\text{}_{1-x}$Fe$\text{}_{x}$Te crystal.
Źródło:
Acta Physica Polonica A; 1997, 92, 4; 793-796
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 42

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