Temat: 79.60.Jv - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Photoelectron Spectroscopy of II-VI Semiconductor Heterostructures
Autorzy:: Wörz, M.
Hampel, M.
Flierl, R.
Gebhardt, W.
Tematy:: 79.60.Jv; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1952740.pdf Link otwiera się w nowym oknie
Opis:: We are growing ZnSe, ZnS and CdSe layers epitaxially on GaAs(001) substrates by atomic layer epitaxy and molecular beam epitaxy. The substrates are prepared by a H-plasma method in order to obtain a sharp interface between substrate and layer. The quality of our samples is controlled by reflection high energy diffraction and X-ray diffraction. Furthermore, the samples are characterized in situ by photoelectron spectroscopy. We observe resonant Zn 3d$\text{}^{8}$ and Cd 4d$\text{}^{8}$ satellites, which are used to check the layer quality. As a result, the valence band offsets of CdSe/ZnSe and ZnSe/CdSe were obtained. The values are ΔE$\text{}_{v}$(ZnSe/CdSe) = -(0.13 ± 0.07) eV and ΔE$\text{}_{v}$(CdSe/ZnSe) = -(0.13 ± 0.07) eV, which confirm the commutativity rule.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Frequency Dependent Electrical Characteristics οf Au/n-Si/CuPc/Au Heterojunction
Autorzy:: Ahmad, Z.
Sayyad, M.
Karimov, Kh.
Saleem, M.
Shah, M.
Tematy:: 79.60.Jv
73.90.+f; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1538707.pdf Link otwiera się w nowym oknie
Opis:: Electrical characteristics of the heterojunction fabricated by thermal deposition of copper phthalocyanine (CuPc) on an n-silicon substrate have been investigated. The frequency has significant effect on capacitance (C), conductance (G) and series resistance $(R_{s})$ interface states $(D_{it})$ of the junction. Measured capacitance and conductance were corrected for $R_{s}$. The conductance technique was used to measure the density of the interface states. This method revealed the value of the interface state density distribution for the Au/n-Si/CuPc/Au interfaces of the order of $10^{12} cm^{-2} eV^{-1}$.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Ultra Fine-Grained Metals Prepared by Severe Plastic Deformation: A Positron Annihilation Study
Autorzy:: Čížek, J.
Procházka, I.
Kužel, R.
Matĕj, Z.
Cherkaska, V.
Cieslar, M.
Smola, B.
Stulíková, I.
Brauer, G.
Anwand, W.
Islamgaliev, R. K.
Kulyasova, O.
Tematy:: 78.70.Bj
79.60.Jv; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/2043303.pdf Link otwiera się w nowym oknie
Opis:: Recent investigations of ultra fine-grained metals (Cu, Fe, Ni) performed within a Prague-Rossendorf-Ufa collaboration will be reviewed. The specimens were prepared by severe plastic deformation: the high-pressure torsion and equal channel angular pressing. Positron annihilation spectroscopy was used as the main method including (i) the conventional lifetime and the Doppler broadening measurements with $\text{}^{22}$Na and (ii) the slow-positron implantation spectroscopy with the Doppler broadening measurement. Other methods were also involved: transmission electron microscopy, X-ray diffraction, and microhardness. First, the mean grain size was determined and defects were identified in the as-deformed materials. Defects concentration and spatial distribution were studied in detail. Dislocations situated in distorted regions along grain boundaries, and a few-vacancy clusters distributed homogeneously inside dislocations-free grains, were observed in the ultra fine-grained Cu, Fe, and Ni. Subsequently, the thermal evolution of the ultra fine-grained structures during isochronal annealing was studied.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Influence of Ceramic Nanoparticles on Thermal Stability of Ultra Fine Grained Copper
Autorzy:: Čížek, J.
Procházka, I.
Cieslar, M.
Islamgaliev, R.
Kulyasova, O.
Tematy:: 78.70.Bj
79.60.Jv; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1812477.pdf Link otwiera się w nowym oknie
Opis:: A detailed study of the bulk ultra fine grained pure copper and copper with $Al_2O_3$ particles was carried out in the present work. The specimens were prepared by the high-pressure torsion and their microstructure was investigated by positron lifetime spectroscopy combined with transmission electron microscopy and microhardness tests. Defects in the as-deformed materials were characterized and the thermal stability of the ultra fine grained microstructure was subsequently examined in annealing experiments. An addition of $Al_2O_3$ nanoparticles was found to improve significantly the thermal stability of the ultra fine grained structure, the optimum content of $Al_2O_3$ being ≈0.5 wt.%.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Zn(Mn)O Surface Alloy Studied by Synchrotron Radiation Photoemission
Autorzy:: Guziewicz, E.
Kopalko, K.
Sadowski, J.
Guziewicz, M.
Golacki, Z.
Tematy:: 73.20.-r
79.60.-i
79.60.Jv; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/2043720.pdf Link otwiera się w nowym oknie
Opis:: The Mn/ZnO(0001) system was investigated by synchrotron radiation photoemission. The Mn/ZnO interface with 4 ML of manganese deposited onto the ZnO surface was annealed up to 500ºC. No Mn capping layer was found at the surface after annealing as was confirmed by scanning Auger spectroscopy experiment. We used a resonant photoemission to extract the Mn3d partial density of states in photoemission spectra. The Mn3d states contribute to the electronic structure of the system within 10 eV of the Fermi level. They show three features: a main peak at 3.8-4.5 eV, a valence structure at the top of the valence band (1-3 eV), and a broad satellite situated between 5.5 and 9 eV below E$\text{}_{F}$. The satellite/main branching ratio was determined to be 0.43, which is a fingerprint of strong hybridization between the Mn3d electrons and the valence band of the crystal. The hybridization effect in Zn$\text{}_{1-x}$ Mn$\text{}_{x}$O surface alloy is comparable to Zn$\text{}_{1-x}$Mn$\text{}_{x}$S and much higher than in Zn$\text{}_{1-x}$Mn$\text{}_{x}$Se, Zn$\text{}_{1-x}$Mn$\text{}_{x}$Te, and Ga$\text{}_{1-x}$Mn$\text{}_{x}$As semimagnetic compounds.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Photoemission Study of Co Adsorbed on K/Cu(110). Analysis of Adsorbate Induced Structures
Autorzy:: Godowski, P. J.
Onsgaard, J.
Christensen, S. V.
Nerlov, J.
Tematy:: 79.60.Jv
33.60.-q
82.80.Pv; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1945414.pdf Link otwiera się w nowym oknie
Opis:: Improved adsorption characteristics of a K predosed Cu(110) surface with a coverage corresponding to a point before the work function minimum have been confirmed. Analysis of the CO-induced orbitals in the photoelectron spectra of the CO/K/Cu(110) interface for low coverages of carbon monoxide adsorbed at 118 K has been done. Noticeable changes of the parameters of the orbitals with increasing CO coverage have been registered. Elongation of the C-O bond without dissociation of the molecule has been deduced from the energetic separation of 3.4 eV between the 4σ and the 1π orbital. A weakening of the CO-interface bond with coverage has been found on the base of decreasing 5σ-1π separation with increasing 4σ/5σ intensity ratio. Perpendicular orientation of CO molecules to the plane of the substrate surface has been concluded from analysis of the constant initial state spectra of the 4σ and 5σ/1π orbitals.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Photoemission Study of CO$\text{}_{2}$ adsorbed on K/Cu(110). Analysis of Adsorbate Induced Structures
Autorzy:: Godowski, P. J.
Onsgaard, J.
Hoffmann, S. V.
Nerlov, J.
Tematy:: 79.60.Jv
33.60.-q
82.80.Pv; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/2007842.pdf Link otwiera się w nowym oknie
Opis:: Using photoemission spectroscopy, adsorption and reaction of CO$\text{}_{2}$ on potassium modified Cu(110) were studied. In agreement with published results of thermally programmed desorption, apart from carbonate and carbon monoxide as the disproportionation reaction products, a linear CO$\text{}_{2}$ molecule and a bent active CO$\text{}_{2}$(-) species were identified. The reaction paths are independent on the potassium precoverage but the number of CO$\text{}_{3}$ molecules increases with the number of potassium adatoms. The presence of the CO$\text{}_{2}$(-), stable up to 200 K, suitable for the reactivity of the interface in respect of the methanol synthesis, could be confirmed in the complex valence band spectra by occurrence of the characteristic peak at binding energy of 6.8 eV.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: CO-induced photoemission structures of the CO/Pt/Ru(0001) interface
Autorzy:: Godowski, P.J.
Onsgaard, J.
Li, Z.
Tematy:: 79.60.Jv
33.60.+q
82.80.Pv; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1058526.pdf Link otwiera się w nowym oknie
Opis:: The CO/Pt/Ru(0001) interface has been re-examined, in great detail, by photoelectron spectroscopy of high resolution under UHV conditions. The Ru(0001) substrate has been modified by platinum at coverages less than corresponding to the one, saturated, Pt overlayer, with no Pt/Ru intermixing. The analysis of the extent to which different regions of the photoelectron spectrum allow a detailed characterization of the interface is presented. The CO adsorption displays interaction with two separate phases: the Pt(111) face and the Ru(0001) surface.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 9.

Tytuł:: Positron Lifetime Spectroscopy of Nanocrystalline Copper
Autorzy:: C̆ížek, J.
Procházka, I.
Vostrý, P.
Chmelík, F.
Islamgaliev, R. K.
Tematy:: 78.70.Bj
79.60.Jv; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/2007957.pdf Link otwiera się w nowym oknie
Opis:: Positron lifetime spectroscopy was applied to investigate the thermal stability of nanocrystalline copper prepared by severe plastic torsion deformation. Positrons annihilating in as prepared specimens exhibited free positron component τ$\text{}_{1}$ and two defect components τ$\text{}_{2}$=164 ps and τ$\text{}_{3}$=255 ps. Evolution of the lifetimes and relative intensities of all the three components with increasing annealing temperature during step-by-step isochronal annealing up to 630°C was studied. Behaviour of positrons in nanocrystalline copper could not be interpreted in the frame of conventional 3-state trapping model due to highly inhomogeneous defect distribution. Therefore a modified trapping model was developed and applied to explain the experimental results.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Cd$\text{}_{1-x}$Fe$\text{}_{x}$Se/Fe Interface Formation Observed by Means of Photoemission Spectroscopy
Autorzy:: Guziewicz, E.
Orłowski, B. A.
Kowalski, B. J.
Barrett, N.
Martinotti, D.
Guillot, C.
Lacharme, J.-P.
Sebenne, C. A.
Tematy:: 73.20.-r
79.60.Jv; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1950803.pdf Link otwiera się w nowym oknie
Opis:: We present a new outlook at the study of metal-semiconductor interface formation. A resonant photoemission spectroscopy tuned to the Fe 3p-3d transition (56 eV) was used to investigate the changes after sequential deposition of Fe atoms on freshly cleaved Cd$\text{}_{0.86}$Fe$\text{}_{0.14}$Se crystal surface. In the first stages (0.6-4 ML) of Fe deposition the contribution of Fe 3d electrons to the valence band grows up markedly indicating the increase in Fe content in the Cd$\text{}_{0.86}$Fe$\text{}_{0.14}$Se crystal surface region. When the amount of Fe exceed 40 ML the resonant photoemission spectra became similar to the Fe metal with some contribution of the ternary crystal substrate.
Dostawca treści:: Biblioteka Nauki

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