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    Wyświetlanie 1-11 z 11
    Tytuł:
    Adsorption of Oxygen on HF-Etched Si(111) Surfaces: XPS Study
    Autorzy:
    Iwanowski, R. J.
    Sobczak, J. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1963382.pdf
    Data publikacji:
    1997-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.60.Dp
    Opis:
    X-ray photoelectron spectroscopy studies of the Si(111) surfaces, after dilute HF etching and methanol rinse, are reported. These included a detailed analysis of the main core-levels (Si 2p, O 1s) and the valence band spectra. The observed asymmetry of the O 1s lines was attributed to two contributing subpeaks: the main (1) and the minor one (2), shifted ≈ 1.5 eV to higher binding energies. Their relative intensity was found to depend on the air exposure time and on the take-off angle. The peaks were assigned to two different positions of surface oxygen: (1) O chemisorbed with methoxy group, (2) bridging O atom. The valence band X-ray photoelectron spectroscopy spectra reveal the influence of surface states induced by the "chemisorbed O"-Si bond.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 4; 793-796
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photoemission Study of the Initial Growth of Co on Ru(0001)
    Autorzy:
    Godowski, P. J.
    Onsgaard, J. J.
    Trzebiatowska-Gusowska, M. J.
    Pater, K. J.
    Li, Zhe
    Powiązania:
    https://bibliotekanauki.pl/articles/2047268.pdf
    Data publikacji:
    2007-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.60.Dp
    79.60.Jv
    68.55.Jk
    Opis:
    The growth process of cobalt on Ru(0001) was characterized by photoelectron spectroscopy excited by X-ray and synchrotron radiation. The binding energy position and intensity of the Co 2p$\text{}_{3}\text{}_{/}\text{}_{2}$ and Ru 3d$\text{}_{5}\text{}_{/}\text{}_{2}$ core levels as well as the shape and structure of the valence band spectra corresponding to the different stages of the deposition were investigated. An observed small positive binding energy shift is a consequence of an increase in the cobalt adatoms coordination number. The core-level shift between bulk and surface Ru atoms is determined as -360 meV. Upon adsorption of cobalt, the interface peak appears with a shift of -(70÷80) meV relative to the bulk one. On the basis of unchanged energy positions and widths of the Ru-derived features of the valence band spectra, a weak interaction between cobalt and substrate is suggested. The measured valence band could be reproduced by superimposing the spectra of the pure elements.
    Źródło:
    Acta Physica Polonica A; 2007, 111, 2; 263-271
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal Desorption of Potassium from Clean and Sulfur Covered Nickel
    Autorzy:
    Błaszczyszyn, R.
    Błaszczyszynowa, M.
    Gubernator, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1943955.pdf
    Data publikacji:
    1995-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.90.+b
    73.30.+y
    79.60.Dp
    Opis:
    Activation energy for thermal desorption of potassium from clean and sulfur covered surfaces of nickel was determined by means of the field emission method. For the low potassium coverage limit (Θ$\text{}_{K}$ ≈ 0.02) the desorption was detected from the whole emitter surface in the temperature range of 825-1000 K for the atoms and of 725-825 K for the species of atoms and ions of the potassium. The activation energies of neutral desorption were found to be E$\text{}_{Ni}^{a}$ = 3.8 eV for the clean nickel and E$\text{}_{S}\text{}_{/}\text{}_{Ni}^{a}$ = 3.0 eV for the sulfur covered nickel, Θ$\text{}_{s}$ ≈ 0.5. The activation energies for the desorption of the species of atoms and ions increased from E$\text{}_{Ni}^{a+i}$ = 2.5 eV for the clean nickel to E$\text{}_{S}\text{}_{/}\text{}_{Ni}^{a+i}$ = 2.9 eV for the sulfur covered nickel Θ$\text{}_{s}$ ≈ 0.5. Also, a value of E$\text{}_{S'}\text{}_{/}\text{}_{Ni}^{a+i}$ = 4.1 eV was found for a higher coverage of sulfur, Θ$\text{}_{s}$ ≈ 1. The results are discussed in terms of Gurney model.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 6; 1151-1160
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Residual Gas Effect on Photofield Emission from Tungsten (111) Face
    Autorzy:
    Hądzel, P.
    Radoń, T.
    Jaskółka, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964227.pdf
    Data publikacji:
    1997-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.70.+q
    79.60.Dp
    73.20.Hb
    Opis:
    Using the photofield emission method, surface states and bulk excitations from clean and residual gas adsorbed (111) face of tungsten were measured. Residual gas shaded the surface states and diminished photoemission from the bulk excitations. Gas of the artificially increased background pressure 10$\text{}^{-8}$ Pa adsorbed during the measurement deforms the photocurrent-voltage characteristic; the optical excitations observed for clean surfaces are exhibited, diminished or lost. For the adsorbed (111) face the state related to the metal-gas surface has been observed.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 6; 1141-1147
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural and Optoelectronic Properties of In-Zn-S sprayed Layers
    Autorzy:
    Lazzez, S.
    Boubaker, K.
    Ben Nasrallah, T.
    Amlouk, M.
    Belgacem, S.
    Mnari, M.
    Chtourou, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812052.pdf
    Data publikacji:
    2008-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.60.Dp
    78.66.Li
    78.30.Am
    Opis:
    In this work, In-Zn-S thin layers were prepared using the spray pyrolysis technique on glass substrates at 320°C. The molar ratio between zinc and indium $x=[Zn^{2+}]//[In^{3+}]$ was varied in 0-0.4 domain whereas $[S^{2-}]//[In^{3+}]$ one was taken constant equal to 2. The atomic composition was carried out with the atomic absorption. The structural study of all layers via X-ray diffraction and atomic force microscopy shows that the layer, obtained using x=0 is formed by binary material $In_2S_3$ with a principal orientation along (400). When the composition increases the same study depicts the presence of other materials such as ZnO, ZnS, and $ZnIn_2S_4$. On the contrary, for x=0.4, the film is mainly formed by the ternary compound $ZnIn_2S_4$ which crystallizes in cubic phase. Moreover, the optical analysis via the transmittance, reflectance as well as the photocurrent reveals that the band gap energy $E_g$ increases slightly as a function of the x composition ($E_g$ varies from 2.6 to 2.9 eV).
    Źródło:
    Acta Physica Polonica A; 2008, 114, 4; 869-880
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of SubPc Self-Assembly on Ag(111)
    Autorzy:
    Petrauskas, V.
    Tornau, E.
    Lapinskas, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1178746.pdf
    Data publikacji:
    2005-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.60.Cn
    68.43.Hn
    79.60.Dp
    81.07.Nb
    Opis:
    The ordering of subphthalocyanine molecules into honeycomb and hexagonal close packed patterns on Ag(111) is described using complex Lennard-Jones-type intermolecular potential. We rescale Ag(111) lattice, and take into account an infinite exclusion of first, second, and third neighbours, attraction - of fourth and fifth, and repulsion - of sixth and seventh. The phase diagram is obtained by the lattice gas model using Monte Carlo simulations. Very strong first order phase transitions, causing the two-phase co-existence, are found between disordered and honeycomb as well as between disordered and hexagonal closed packed phases.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 2; 388-391
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adsorption Properties of the Cu(115) Surface: Basic Interfaces
    Autorzy:
    Godowski, P.
    Groso, A.
    Hoffmann, S.
    Onsgaard, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1537740.pdf
    Data publikacji:
    2010-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.43.Fg
    68.55.Ac
    61.14.Hg
    79.60.Dp
    Opis:
    The interfaces: K/Cu(115) and CO/Cu(115) have been characterized using surface sensitive techniques, including low energy electron diffraction and photoelectron spectroscopy. K adatoms show tendency to occupy the sites close to the step edges. At low temperature (near 125 K), after completion of two layers, potassium grows in 3D islands (the Stranski-Krastanov mode). At higher temperature, e.g. at room temperature, potassium introduces reconstruction of the substrate even at low coverages. Calibration of the alkali coverage, up to completion of the first layer, using the work function changes curve has been confirmed as a very convenient and precise procedure. The adsorbed state of CO at 130 K has been identified by registration of core levels obtained by the use synchrotron radiation photoelectron spectroscopy. The characteristics of the main 1s and satellite peaks have been analyzed in context of substrate geometry and compared with the ones of other copper planes. There are no indications of dissociative adsorption of CO, only residual carbon and oxygen were found after adsorbate desorption around 220 K. CO molecules show a strong tendency to "on top" adsorption in sites far from the step edges of the Cu(115) surface.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 6; 928-935
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ellipsometrical and SEM Study of Ferritin Adsorption οn a Gold Surface
    Autorzy:
    Vladimirova, L.
    Tsutsumanova, G.
    Gritzkow, Al.
    Savov, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1795711.pdf
    Data publikacji:
    2009-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.60.Dp
    87.64.Ee
    87.14.Df
    82.45.Jm
    Opis:
    The adsorption of horse spleen ferritin on gold surface is studied with null ellipsometry and scanning electron microscopy. The high sensitivity and in situ advantage of ellipsometry make it very attractive for studies of ultrathin biomolecular layers. The influence of pH and protein concentration in solution on the adsorption kinetics was interpreted using ex situ scanning electron microscopy shots and computer modeling of the system "prism-gold film-adsorbed layer-solution". It seems that the first fast stage comprises nucleation process occurring at active sites and the following slow multistage process of a protein film growth. The data about adsorption kinetics of protein and the structure of the adsorbate layers obtained in this study enable understanding of such processes in real biological system, e.g. the protein adsorption on blood vessels and tissues in pathological processes.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 4; 705-707
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Ellipsometrical and AFM Study οf Ferritin Adsorption Kinetics on a Gold Surface
    Autorzy:
    Vladimirova, L.
    Andreeva, A.
    Savov, V.
    Gritzkow, A.
    Burova, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1795704.pdf
    Data publikacji:
    2009-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.60.Dp
    42.62.Be
    73.30.+y
    78.68.+m
    Opis:
    The kinetics of ferritin adsorption on gold (Au) surface was studied with ellipsometry and atomic force microscopy. The thickness and the refraction index of the adsorbed layer were determined using a theoretical model system: air-interface layer-solution-adsorbed layer-gold surface. The relations between the parameters of the adsorbed layer and pH and the protein concentration are obtained. It seems that the ferritin adsorption is a relatively slow multi-stage process. The obtained results enable modelling of the protein adsorption on blood vessels and tissues in pathological processes. The kinetics of protein adsorption could be implemented in medical applications and in development of new biosensor systems.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 4; 687-689
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Formation of Excess Silicon on 6H-SiC(0001) during Hydrogen Etching
    Autorzy:
    Grodzicki, M.
    Wasielewski, R.
    Surma, S.
    Ciszewski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807513.pdf
    Data publikacji:
    2009-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.65.Cf
    81.15.Gh
    72.80.Jc
    79.60.Dp
    68.37.Ps
    Opis:
    The surface of 6H-SiC(0001) samples was subjected to etching under $H_{2}$/Ar gas mixture in a cold-wall tubular furnace. Its topography and properties were characterized by atomic force microscopy and X-ray photoelectron spectroscopy before and after hydrogen etching. The conditions have been found, under which surface polishing-related damages could be removed. Si droplets were observed under certain etching conditions. The effect of the samples' cooling rate on the obtained surface morphology and chemistry was investigated to unveil the mechanism of Si recrystallization onto the crystal surface upon etching.
    Źródło:
    Acta Physica Polonica A; 2009, 116, S; S-82-S-85
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the Temperature-Dependent Surface Structure of Metals
    Autorzy:
    Bonzel, H. P.
    Breuer, U.
    Powiązania:
    https://bibliotekanauki.pl/articles/1892524.pdf
    Data publikacji:
    1992-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.35.Rh
    68.35.Md
    79.60.Cn
    82.65.Dp
    Opis:
    Recent experimental results based on X-ray photoelectron diffraction from a Pb(110) crystal are discussed in terms of surface roughening and surface melting. In comparison to other reports on Pb(110) surface roughening it is recognized that the correct determination of the roughening transition on (110) surfaces of fcc metals may be intrinsically difficult because of anisotropy. A novel technique for investigating the temperature-dependent surface free energy is described. The method involves the quasi-steady-state shape of periodic surface profiles on Au(111) and Au(100) single crystals. First results are reported for two crystallographic zones (111)⟨112⟩ and (100)⟨110⟩ of Au. These results illustrate the strong anisotropy of Δγ/γ of ~23% and ~ 4% at T = 0 K for the (111)⟨112⟩ and (100)⟨110⟩ zones, respectively. The data suggest that the low-index surfaces of Au(111) and (100) are not likely to roughen at T ≤ T_{M}.
    Źródło:
    Acta Physica Polonica A; 1992, 81, 2; 265-272
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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