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Nguyen-Truong H.T.,Volgograd State Technical University
Journal of Electron Spectroscopy and Related Phenomena | Year: 2014

An approach to include plasmon damping in the energy-loss function is described within the dielectric theory. Use of the energy-loss function included damping for calculating the electron inelastic mean free path yields results in good agreement with the experimental data and other theoretical results at medium-high energies. At a few eV above the Fermi energy, the present results are entirely consistent with those obtained from other measurements for Au. Also, a simple way to predict the values of damping and lifetime at low energies is described. Two values of lifetime for an electron with energy (above the Fermi energy) of 5 eV in Al and 6 eV in Au are predicted to be 2.18 fs and 1.70 fs, respectively. These predicted values are in reasonable agreement with those estimated from other measurements at the corresponding energies: 2.16 ± 0.22 fs in Al, and 1.91 ± 0.32 fs in Au. © 2014 Elsevier B.V. Source

The maximum energy loss for electron stopping power calculations by the full Penn algorithm within the dielectric formalism is determined with taking into account the contribution of electron and plasmon excitations. Use of these calculated electron stopping powers in Monte Carlo simulations applying continuous slowing down approximation gives the backscattering electron yields in much better agreement with experimental data than previous other theoretical results. The muffin-tin model is used to describe the electron elastic scattering by atom bound in solids with taking into account the exchange correlation and polarization effect. © 2013 AIP Publishing LLC. Source

Nguyen-Truong H.T.,Volgograd State Technical University
Journal of Physical Chemistry C | Year: 2015

We present an approach for introducing damping into the Penn algorithm by using the Mermin dielectric function instead of the Lindhard dielectric function. We find that for a damping of 1.5 eV, the electron inelastic mean free path calculated by the present algorithm for Al is in excellent agreement with experimental values in the energy range 5-9 eV. Meanwhile, for a damping of 2.0 eV, our result for Au is consistent with the GW+T ab initio calculation at several electronvolts. In particular, at an energy of 1 eV, our result for Au is 297 Å and lies within the range 220-330 Å obtained from measurements by ballistic electron emission microscopy. © 2015 American Chemical Society. Source

Nguyen-Truong H.T.,Volgograd State Technical University
Ultramicroscopy | Year: 2015

We propose a modified Bethe formula for low-energy electron stopping power without fitting parameters for a wide range of elements and compounds. This formula maintains the generality of the Bethe formula and gives reasonable agreement in comparing the predicted stopping powers for 15 elements and 6 compounds with the experimental data and those calculated within dielectric theory including the exchange effect. Use of the stopping power obtained from this formula for hydrogen silsesquioxane in Monte Carlo simulation gives the energy deposition distribution in consistent with the experimental data. © 2014 Elsevier B.V. Source

Kryuchkov S.V.,Volgograd State Technical University | Kukhar' E.I.,Volgograd State University
Physica E: Low-Dimensional Systems and Nanostructures | Year: 2012

In tight binding approximation the explicit view of electron energy in graphene superlattice was derived. The possibility of propagation of the cnoidal waves in graphene superlattice is discussed. The direct current induced perpendicularly to the superlattice axis by cnoidal and sinusoidal electromagnetic waves under the presence of longitudinal constant electric field was calculated. Such direct current was shown to change its direction when the intensity of longitudinal electric field changes its absolute value. © 2012 Elsevier B.V. Source

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