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Papers by Victor Yarzhemsky

Research paper thumbnail of Determination of the Thickness of Ultrathin Gold Films from X-ray Photoelectron Spectroscopy Data

Inorganic Materials, 2005

Research paper thumbnail of Influence of nondipolar effects on the photoelectron angular distribution upon photoionization of 2p and 3d atomic shells

Optics and Spectroscopy, 2004

Relativistic calculations of the angular distribution of photoelectrons upon photoionization of 2... more Relativistic calculations of the angular distribution of photoelectrons upon photoionization of 2p and 3d shells in the range of photoelectron energies from 1 to 10 keV are carried out for unpolarized and linearly polarized radiation. An exact expression for the angular distribution of photoelectrons that takes into account nondipolar terms of the order of O[(kr)2] (k is the photon energy and r is the radius of the ionized shell) is obtained in the case of unpolarized radiation. It is shown that the contribution of the O[(kr)2] terms to the differential cross section can be considerable, reaching 24% at the maximum energy considered. Accounting for such terms in the calculation of the ratio of differential cross sections, which is experimentally measured at a certain geometry of angles in the case of linearly polarized radiation, can change this ratio twofold. The parameters of the angular distribution, which are necessary for the conduction of a quantitative x-ray photoelectron analysis, are given for the 2p 1/2 and 2p 3/2 shells of elements with 11≤Z≤29 and for the 3d 3/2 and 3d 5/2 shells of elements with 30≤Z≤54.

Research paper thumbnail of Relativistic photoelectron angular distribution parameters in the quadrupole approximation

Journal of Physics B: Atomic, Molecular and Optical Physics, 2001

ABSTRACT

Research paper thumbnail of Effective atomic charges and charge transfer after photoionization in sulfur compounds and phosphorus compounds

Journal of Electron Spectroscopy and Related Phenomena, 1994

Research paper thumbnail of Influence of octupole photoionization transitions on the angular distribution of photoelectrons from solids with account for elastic scattering

Journal of Electron Spectroscopy and Related Phenomena, 2005

ABSTRACT Using the transport theory approach, equations are derived for the angular dependence of... more ABSTRACT Using the transport theory approach, equations are derived for the angular dependence of XPS intensities from semi-infinite solids taking into account elastic scattering of photoelectrons and non-dipolar transitions up the second-order corrections. The unpolarized excitation source is considered. The elastic scattering is the main term smearing the non-dipolar contribution in complete analogy with smearing of dipole contribution. Some additional terms are shown to be negligible in comparison with the main term for complete sets of emission and azimuth angles, three representative single scattering albedo values and several representative sets of the second-order non-dipolar parameters. The photoelectron angular distributions are calculated for Al 2s and Ag 3d lines using transport theory and Monte-Carlo simulation. The Monte-Carlo calculations are in agreement with transport theory approach.

Research paper thumbnail of The influence of octupole transitions on the XPS intensities

Journal of Electron Spectroscopy and Related Phenomena, 2003

Research paper thumbnail of Angular distribution of photoelectrons from solids with account for elastic scattering and non-dipolar transitions up to the second order corrections: the linearly polarized excitation

Journal of Electron Spectroscopy and Related Phenomena, 2003

Using the transport theory approach, equations are derived for the angular dependence of X-ray ph... more Using the transport theory approach, equations are derived for the angular dependence of X-ray photoelectron spectroscopy intensities from semi-infinite solids taking into account elastic scattering of photoelectrons and non-dipolar transitions up the second order corrections. The linearly polarized source is considered. The elastic scattering presented by the main term smeared the non-dipolar contribution in complete analogy with smearing of dipole

Research paper thumbnail of The influence of core hole relaxation on the main-line intensities in X-ray photoelectron spectra

Journal of Electron Spectroscopy and Related Phenomena, 2002

The main photoelectron line spectroscopic factors that are currently used in photoelectron spectr... more The main photoelectron line spectroscopic factors that are currently used in photoelectron spectroscopy for quantitative analysis are calculated for a broad set of atoms. General trends of the behaviour of the spectroscopic factors of core atomic levels are discussed. The influence of the spectroscopic factors on the main line intensities and on concentrations of the elements, that are obtained using X-ray photoelectron spectra, is analysed.

Research paper thumbnail of Subgroups of Hypercubic Group and Many Electron States in Crystals

International Journal of Theoretical Physics, 2006

The point subgroups of index 2 of hypercubic group and their irreducible representations are obta... more The point subgroups of index 2 of hypercubic group and their irreducible representations are obtained. The elements of the hypercubic group are represented as rotation about two axis. Possible physical meaning of hypercubic group for electron states is investigated. The reduction relations for the representations of orthogonal group O4 on hypercubic group are obtained. These relations are used for additional classification of electron states in crystals.

Research paper thumbnail of Structure of triplet states in magnetic crystals

Doklady Physics, 2007

ABSTRACT A group theoretical method for constructing and analyzing the structure of two-electron ... more ABSTRACT A group theoretical method for constructing and analyzing the structure of two-electron states in crystals and its application to particular materials is presented. The induced-representation method or the projection-operator method can be used to construct the singlet and triplet two-electron wave functions transformed according to the irreducible representations of the symmetry group. The difference between the symmetry groups of the coordinate and spin subsystem allows to choose the symmetry of the two-electron state so that the spatial operators act only on the coordinate part, and time reversal, only on the spin part. The group theoretical method makes it possible to reveal the dependence of their structure on the symmetry group.

Research paper thumbnail of Crystal symmetry and the structure of two-electron states in high-temperature superconductors

Doklady Physics, 2005

1. The main characteristic of unusual superconductors such as heavy-fermion superconductors and h... more 1. The main characteristic of unusual superconductors such as heavy-fermion superconductors and hightemperature superconductors (HTSCs) is that the superconducting order parameter (SOP) vanishes at points and lines of the Fermi surface [1‐3]. For spherically symmetric interaction, the SOP coincides with the wave function of a Cooper pair.

Research paper thumbnail of The effect of octupole transitions on the intensity of X-ray-photoelectron spectra under photoionization

Doklady Physics, 2003

Without Abstract

Research paper thumbnail of Determination of the thickness of ultrathin films by X-ray photoelectron spectroscopy

Research paper thumbnail of Contribution of octupole transitions to the angular distribution of photoelectrons emitted in photoionization

Doklady Physics, 2003

Without Abstract

Research paper thumbnail of Nuclear spin—spin coupling constants and mutual influence of the ligands

Research paper thumbnail of Additional Quantum Numbers for Electron Orbitals of Nanoparticles

arXiv (Cornell University), Apr 21, 2011

Research paper thumbnail of On the validity of the quasi-particle approximation in photoelectron spectroscopy

Journal of Physics B: Atomic and Molecular Physics, 1985

ABSTRACT

Research paper thumbnail of Linewidths and intensities of satellites in photoelectron spectra in the presence of an underlying continuum

Journal of Physics B: Atomic, Molecular and Optical Physics, 1995

ABSTRACT

Research paper thumbnail of Calculation of the shake-up satellites in the 1s and 2s X-ray photoelectron spectra of neon

Journal of Physics B: Atomic, Molecular and Optical Physics, 1993

ABSTRACT

Research paper thumbnail of Electronic structure and the structure of the order parameter in high-T c superconductors based on copper oxides and iron pnictides

Inorganic Materials, 2014

Experimental data on the symmetry of the superconducting state in the high T c superconductors ba... more Experimental data on the symmetry of the superconducting state in the high T c superconductors based on copper oxides and iron pnictides have been analyzed using a space group approach to the wavefunc tion of a Cooper pair. We have found the irreducible representations of the crystal symmetry groups of these materials for singlet states with zero total momentum corresponding to experimental data on the structure of their order parameter.

Research paper thumbnail of Determination of the Thickness of Ultrathin Gold Films from X-ray Photoelectron Spectroscopy Data

Inorganic Materials, 2005

Research paper thumbnail of Influence of nondipolar effects on the photoelectron angular distribution upon photoionization of 2p and 3d atomic shells

Optics and Spectroscopy, 2004

Relativistic calculations of the angular distribution of photoelectrons upon photoionization of 2... more Relativistic calculations of the angular distribution of photoelectrons upon photoionization of 2p and 3d shells in the range of photoelectron energies from 1 to 10 keV are carried out for unpolarized and linearly polarized radiation. An exact expression for the angular distribution of photoelectrons that takes into account nondipolar terms of the order of O[(kr)2] (k is the photon energy and r is the radius of the ionized shell) is obtained in the case of unpolarized radiation. It is shown that the contribution of the O[(kr)2] terms to the differential cross section can be considerable, reaching 24% at the maximum energy considered. Accounting for such terms in the calculation of the ratio of differential cross sections, which is experimentally measured at a certain geometry of angles in the case of linearly polarized radiation, can change this ratio twofold. The parameters of the angular distribution, which are necessary for the conduction of a quantitative x-ray photoelectron analysis, are given for the 2p 1/2 and 2p 3/2 shells of elements with 11≤Z≤29 and for the 3d 3/2 and 3d 5/2 shells of elements with 30≤Z≤54.

Research paper thumbnail of Relativistic photoelectron angular distribution parameters in the quadrupole approximation

Journal of Physics B: Atomic, Molecular and Optical Physics, 2001

ABSTRACT

Research paper thumbnail of Effective atomic charges and charge transfer after photoionization in sulfur compounds and phosphorus compounds

Journal of Electron Spectroscopy and Related Phenomena, 1994

Research paper thumbnail of Influence of octupole photoionization transitions on the angular distribution of photoelectrons from solids with account for elastic scattering

Journal of Electron Spectroscopy and Related Phenomena, 2005

ABSTRACT Using the transport theory approach, equations are derived for the angular dependence of... more ABSTRACT Using the transport theory approach, equations are derived for the angular dependence of XPS intensities from semi-infinite solids taking into account elastic scattering of photoelectrons and non-dipolar transitions up the second-order corrections. The unpolarized excitation source is considered. The elastic scattering is the main term smearing the non-dipolar contribution in complete analogy with smearing of dipole contribution. Some additional terms are shown to be negligible in comparison with the main term for complete sets of emission and azimuth angles, three representative single scattering albedo values and several representative sets of the second-order non-dipolar parameters. The photoelectron angular distributions are calculated for Al 2s and Ag 3d lines using transport theory and Monte-Carlo simulation. The Monte-Carlo calculations are in agreement with transport theory approach.

Research paper thumbnail of The influence of octupole transitions on the XPS intensities

Journal of Electron Spectroscopy and Related Phenomena, 2003

Research paper thumbnail of Angular distribution of photoelectrons from solids with account for elastic scattering and non-dipolar transitions up to the second order corrections: the linearly polarized excitation

Journal of Electron Spectroscopy and Related Phenomena, 2003

Using the transport theory approach, equations are derived for the angular dependence of X-ray ph... more Using the transport theory approach, equations are derived for the angular dependence of X-ray photoelectron spectroscopy intensities from semi-infinite solids taking into account elastic scattering of photoelectrons and non-dipolar transitions up the second order corrections. The linearly polarized source is considered. The elastic scattering presented by the main term smeared the non-dipolar contribution in complete analogy with smearing of dipole

Research paper thumbnail of The influence of core hole relaxation on the main-line intensities in X-ray photoelectron spectra

Journal of Electron Spectroscopy and Related Phenomena, 2002

The main photoelectron line spectroscopic factors that are currently used in photoelectron spectr... more The main photoelectron line spectroscopic factors that are currently used in photoelectron spectroscopy for quantitative analysis are calculated for a broad set of atoms. General trends of the behaviour of the spectroscopic factors of core atomic levels are discussed. The influence of the spectroscopic factors on the main line intensities and on concentrations of the elements, that are obtained using X-ray photoelectron spectra, is analysed.

Research paper thumbnail of Subgroups of Hypercubic Group and Many Electron States in Crystals

International Journal of Theoretical Physics, 2006

The point subgroups of index 2 of hypercubic group and their irreducible representations are obta... more The point subgroups of index 2 of hypercubic group and their irreducible representations are obtained. The elements of the hypercubic group are represented as rotation about two axis. Possible physical meaning of hypercubic group for electron states is investigated. The reduction relations for the representations of orthogonal group O4 on hypercubic group are obtained. These relations are used for additional classification of electron states in crystals.

Research paper thumbnail of Structure of triplet states in magnetic crystals

Doklady Physics, 2007

ABSTRACT A group theoretical method for constructing and analyzing the structure of two-electron ... more ABSTRACT A group theoretical method for constructing and analyzing the structure of two-electron states in crystals and its application to particular materials is presented. The induced-representation method or the projection-operator method can be used to construct the singlet and triplet two-electron wave functions transformed according to the irreducible representations of the symmetry group. The difference between the symmetry groups of the coordinate and spin subsystem allows to choose the symmetry of the two-electron state so that the spatial operators act only on the coordinate part, and time reversal, only on the spin part. The group theoretical method makes it possible to reveal the dependence of their structure on the symmetry group.

Research paper thumbnail of Crystal symmetry and the structure of two-electron states in high-temperature superconductors

Doklady Physics, 2005

1. The main characteristic of unusual superconductors such as heavy-fermion superconductors and h... more 1. The main characteristic of unusual superconductors such as heavy-fermion superconductors and hightemperature superconductors (HTSCs) is that the superconducting order parameter (SOP) vanishes at points and lines of the Fermi surface [1‐3]. For spherically symmetric interaction, the SOP coincides with the wave function of a Cooper pair.

Research paper thumbnail of The effect of octupole transitions on the intensity of X-ray-photoelectron spectra under photoionization

Doklady Physics, 2003

Without Abstract

Research paper thumbnail of Determination of the thickness of ultrathin films by X-ray photoelectron spectroscopy

Research paper thumbnail of Contribution of octupole transitions to the angular distribution of photoelectrons emitted in photoionization

Doklady Physics, 2003

Without Abstract

Research paper thumbnail of Nuclear spin—spin coupling constants and mutual influence of the ligands

Research paper thumbnail of Additional Quantum Numbers for Electron Orbitals of Nanoparticles

arXiv (Cornell University), Apr 21, 2011

Research paper thumbnail of On the validity of the quasi-particle approximation in photoelectron spectroscopy

Journal of Physics B: Atomic and Molecular Physics, 1985

ABSTRACT

Research paper thumbnail of Linewidths and intensities of satellites in photoelectron spectra in the presence of an underlying continuum

Journal of Physics B: Atomic, Molecular and Optical Physics, 1995

ABSTRACT

Research paper thumbnail of Calculation of the shake-up satellites in the 1s and 2s X-ray photoelectron spectra of neon

Journal of Physics B: Atomic, Molecular and Optical Physics, 1993

ABSTRACT

Research paper thumbnail of Electronic structure and the structure of the order parameter in high-T c superconductors based on copper oxides and iron pnictides

Inorganic Materials, 2014

Experimental data on the symmetry of the superconducting state in the high T c superconductors ba... more Experimental data on the symmetry of the superconducting state in the high T c superconductors based on copper oxides and iron pnictides have been analyzed using a space group approach to the wavefunc tion of a Cooper pair. We have found the irreducible representations of the crystal symmetry groups of these materials for singlet states with zero total momentum corresponding to experimental data on the structure of their order parameter.