A dispersion relation for a multi-component high-degenerate plasma is investigated by applying th... more A dispersion relation for a multi-component high-degenerate plasma is investigated by applying the RPA to an idealised system in which carriers are assumed to be free charged particles with isotropic effective mass. The dispersion relation is expanded up to the sixth-order terms in the wave vector and the frequencies of optical and acoustic plasma modes are calculated.
A three-component plasma in which one component is higly degenerate and the other two are in clas... more A three-component plasma in which one component is higly degenerate and the other two are in classical regime is considered. The frequencies of acoustic and optical plasma modes are found using the RPA and expanding the response function in the low- and high-frequency limit.
ABSTRACT We calculate the spectrum of photoelectrons excited from localized levels in solids far ... more ABSTRACT We calculate the spectrum of photoelectrons excited from localized levels in solids far into the continuum (XPS situation), in a model that takes into account exactly their interaction with a boson-like spatially non-uniform field. The general results are applied to discuss the spectra of photoelectrons in metals, where the dominant interaction is the coupling to bulk and surface plasmons. In particular, we study the modification of spectral sum rules connecting the strength of inelastic processes with the energy shifts in the spectrum, showing that the electron (“extrinsic”) scattering changes the average position of the spectrum with respect to the pure “intrinsic” result in the “sudden approximation”, which leads also to its dependence on the excitation energy and position of localized level. We estimate these deviations in a simple model which nevertheless reproduces correctly the dynamical aspects of the problem.
Thermal stability of TiO2 thin polycrystalline films obtained by the very simple chemical vapour ... more Thermal stability of TiO2 thin polycrystalline films obtained by the very simple chemical vapour deposition method on the quartz, molybdenum and gold substrates have been examined by X-ray photoelectron and Auger spectroscopy (XPS and AES), respectively, before and after annealing in vacuum at temperatures from 298 K to 1200 K. In this temperature range we have found carbon, water, and O-H groups as the impurities at the surface of the films. The possible influence of both the annealing and the impurities on the film stoichiometry is discussed.
We have performed ab initio density functional calculations of thin Ag films on the Pd(111) surfa... more We have performed ab initio density functional calculations of thin Ag films on the Pd(111) surface. We have calculated the structural properties and the electronic bands of the Ag/Pd systems. There is a band gap in the electronic density of states around the centre of the two-dimensional Brillouin zone of the Pd(111) surface, which makes possible the formation of localised states in the adsorbed silver films. We find that quantum well states may form at binding energies around 4 eV.
We have performed ab initio density functional calculations of thin Ag films on the Pd(111) surfa... more We have performed ab initio density functional calculations of thin Ag films on the Pd(111) surface. We have calculated the structural properties and the electronic bands of the Ag/Pd systems. There is a band gap in the electronic density of states around the centre of the two-dimensional Brillouin zone of the Pd(111) surface, which makes possible the formation of localised states in the adsorbed silver films. We find that quantum well states may form at binding energies around 4 eV.
ABSTRACT Using a phenomenological approach, we have calculated the effect of surface-plasmon disp... more ABSTRACT Using a phenomenological approach, we have calculated the effect of surface-plasmon dispersion and damping on the intensity of plasmon satellites in X-ray photoemission from adsorbates. The calculation reveals appreciable reduction in satellite intensity when compared with the prediction of a previously-used model which assumes dispersionless, infinite-lifetime plasmons.
ABSTRACT The way of preparation of thin films of TiO2 is extremely important regarding its applic... more ABSTRACT The way of preparation of thin films of TiO2 is extremely important regarding its application in electronic and optoelectronic devices. We have assembled Zn/(PEO)(4)ZnCl2/TiO2,SnO2 or ITO rechargeable galvanic cells using CVD (chemical vapour deposition) or ALE (atomic layer epitaxy) produced TiO2 cathodes. The charge-discharge cycles were measured with a constant current in the range of 10(-6) to 10(-5) A for different cells. It was shown that CVD prepared TiO2 cathode is increasing capacity of the cell by allowing higher constant currents to be applied to the cell. The complex impedance measurements of the electrolyte (PEO)(4)ZnCl2 have been performed in the range of 1 Hz to 1 MHz and in the temperature range from 290 to 400 K by applying Zn or Sn electrodes.
We have performed ab initio density functional calculations of thin Ag films on the Pd(111) surfa... more We have performed ab initio density functional calculations of thin Ag films on the Pd(111) surface. We have calculated the structural properties and the electronic bands of the Ag/Pd systems. There is a band gap in the electronic density of states around the centre of the two-dimensional Brillouin zone of the Pd(111) surface, which makes possible the formation of localised states in the adsorbed silver films. We find that quantum-well states may form at binding energies around 4eV.
Thermal stability of TiO2 thin polycrystalline films obtained by the very simple chemical vapour ... more Thermal stability of TiO2 thin polycrystalline films obtained by the very simple chemical vapour deposition method on the quartz, molybdenum and gold substrates have been examined by X-ray photoelectron and Auger spectroscopy (XPS and AES), respectively, before and after annealing in vacuum at temperatures from 298 K to 1200 K. In this temperature range we have found carbon, water, and O-H groups as the impurities at the surface of the films. The possible influence of both the annealing and the impurities on the film stoichiometry is discussed.
A dispersion relation for a multi-component high-degenerate plasma is investigated by applying th... more A dispersion relation for a multi-component high-degenerate plasma is investigated by applying the RPA to an idealised system in which carriers are assumed to be free charged particles with isotropic effective mass. The dispersion relation is expanded up to the sixth-order terms in the wave vector and the frequencies of optical and acoustic plasma modes are calculated.
A three-component plasma in which one component is higly degenerate and the other two are in clas... more A three-component plasma in which one component is higly degenerate and the other two are in classical regime is considered. The frequencies of acoustic and optical plasma modes are found using the RPA and expanding the response function in the low- and high-frequency limit.
ABSTRACT We calculate the spectrum of photoelectrons excited from localized levels in solids far ... more ABSTRACT We calculate the spectrum of photoelectrons excited from localized levels in solids far into the continuum (XPS situation), in a model that takes into account exactly their interaction with a boson-like spatially non-uniform field. The general results are applied to discuss the spectra of photoelectrons in metals, where the dominant interaction is the coupling to bulk and surface plasmons. In particular, we study the modification of spectral sum rules connecting the strength of inelastic processes with the energy shifts in the spectrum, showing that the electron (“extrinsic”) scattering changes the average position of the spectrum with respect to the pure “intrinsic” result in the “sudden approximation”, which leads also to its dependence on the excitation energy and position of localized level. We estimate these deviations in a simple model which nevertheless reproduces correctly the dynamical aspects of the problem.
Thermal stability of TiO2 thin polycrystalline films obtained by the very simple chemical vapour ... more Thermal stability of TiO2 thin polycrystalline films obtained by the very simple chemical vapour deposition method on the quartz, molybdenum and gold substrates have been examined by X-ray photoelectron and Auger spectroscopy (XPS and AES), respectively, before and after annealing in vacuum at temperatures from 298 K to 1200 K. In this temperature range we have found carbon, water, and O-H groups as the impurities at the surface of the films. The possible influence of both the annealing and the impurities on the film stoichiometry is discussed.
We have performed ab initio density functional calculations of thin Ag films on the Pd(111) surfa... more We have performed ab initio density functional calculations of thin Ag films on the Pd(111) surface. We have calculated the structural properties and the electronic bands of the Ag/Pd systems. There is a band gap in the electronic density of states around the centre of the two-dimensional Brillouin zone of the Pd(111) surface, which makes possible the formation of localised states in the adsorbed silver films. We find that quantum well states may form at binding energies around 4 eV.
We have performed ab initio density functional calculations of thin Ag films on the Pd(111) surfa... more We have performed ab initio density functional calculations of thin Ag films on the Pd(111) surface. We have calculated the structural properties and the electronic bands of the Ag/Pd systems. There is a band gap in the electronic density of states around the centre of the two-dimensional Brillouin zone of the Pd(111) surface, which makes possible the formation of localised states in the adsorbed silver films. We find that quantum well states may form at binding energies around 4 eV.
ABSTRACT Using a phenomenological approach, we have calculated the effect of surface-plasmon disp... more ABSTRACT Using a phenomenological approach, we have calculated the effect of surface-plasmon dispersion and damping on the intensity of plasmon satellites in X-ray photoemission from adsorbates. The calculation reveals appreciable reduction in satellite intensity when compared with the prediction of a previously-used model which assumes dispersionless, infinite-lifetime plasmons.
ABSTRACT The way of preparation of thin films of TiO2 is extremely important regarding its applic... more ABSTRACT The way of preparation of thin films of TiO2 is extremely important regarding its application in electronic and optoelectronic devices. We have assembled Zn/(PEO)(4)ZnCl2/TiO2,SnO2 or ITO rechargeable galvanic cells using CVD (chemical vapour deposition) or ALE (atomic layer epitaxy) produced TiO2 cathodes. The charge-discharge cycles were measured with a constant current in the range of 10(-6) to 10(-5) A for different cells. It was shown that CVD prepared TiO2 cathode is increasing capacity of the cell by allowing higher constant currents to be applied to the cell. The complex impedance measurements of the electrolyte (PEO)(4)ZnCl2 have been performed in the range of 1 Hz to 1 MHz and in the temperature range from 290 to 400 K by applying Zn or Sn electrodes.
We have performed ab initio density functional calculations of thin Ag films on the Pd(111) surfa... more We have performed ab initio density functional calculations of thin Ag films on the Pd(111) surface. We have calculated the structural properties and the electronic bands of the Ag/Pd systems. There is a band gap in the electronic density of states around the centre of the two-dimensional Brillouin zone of the Pd(111) surface, which makes possible the formation of localised states in the adsorbed silver films. We find that quantum-well states may form at binding energies around 4eV.
Thermal stability of TiO2 thin polycrystalline films obtained by the very simple chemical vapour ... more Thermal stability of TiO2 thin polycrystalline films obtained by the very simple chemical vapour deposition method on the quartz, molybdenum and gold substrates have been examined by X-ray photoelectron and Auger spectroscopy (XPS and AES), respectively, before and after annealing in vacuum at temperatures from 298 K to 1200 K. In this temperature range we have found carbon, water, and O-H groups as the impurities at the surface of the films. The possible influence of both the annealing and the impurities on the film stoichiometry is discussed.
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Papers by Damir Sokcevic