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Title: Polarizational stopping power of heavy-ion diclusters in two-dimensional electron liquids

Abstract

The in-plane polarizational stopping power of heavy-ion diclusters in a two-dimensional strongly coupled electron liquid is studied. Analytical expressions for the stopping power of both fast and slow projectiles are derived. To go beyond the random-phase approximation we make use of the inverse dielectric function obtained by means of the method of moments and some recent analytical expressions for the static local-field correction factor.

Authors:
; ;  [1]
  1. Departament de Matematica Aplicada, Universitat Politecnica de Valencia, 46022 Valencia (Spain)
Publication Date:
OSTI Identifier:
20957777
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. B, Condensed Matter and Materials Physics; Journal Volume: 75; Journal Issue: 11; Other Information: DOI: 10.1103/PhysRevB.75.115109; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BEAM-PLASMA SYSTEMS; DIELECTRIC MATERIALS; ELECTRON CORRELATION; HEAVY IONS; ION BEAMS; LIQUIDS; MOMENTS METHOD; RANDOM PHASE APPROXIMATION; STOPPING POWER; TWO-DIMENSIONAL CALCULATIONS

Citation Formats

Ballester, D., Fuentes, A. M., and Tkachenko, I. M. Polarizational stopping power of heavy-ion diclusters in two-dimensional electron liquids. United States: N. p., 2007. Web. doi:10.1103/PHYSREVB.75.115109.
Ballester, D., Fuentes, A. M., & Tkachenko, I. M. Polarizational stopping power of heavy-ion diclusters in two-dimensional electron liquids. United States. doi:10.1103/PHYSREVB.75.115109.
Ballester, D., Fuentes, A. M., and Tkachenko, I. M. Thu . "Polarizational stopping power of heavy-ion diclusters in two-dimensional electron liquids". United States. doi:10.1103/PHYSREVB.75.115109.
@article{osti_20957777,
title = {Polarizational stopping power of heavy-ion diclusters in two-dimensional electron liquids},
author = {Ballester, D. and Fuentes, A. M. and Tkachenko, I. M.},
abstractNote = {The in-plane polarizational stopping power of heavy-ion diclusters in a two-dimensional strongly coupled electron liquid is studied. Analytical expressions for the stopping power of both fast and slow projectiles are derived. To go beyond the random-phase approximation we make use of the inverse dielectric function obtained by means of the method of moments and some recent analytical expressions for the static local-field correction factor.},
doi = {10.1103/PHYSREVB.75.115109},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 11,
volume = 75,
place = {United States},
year = {Thu Mar 15 00:00:00 EDT 2007},
month = {Thu Mar 15 00:00:00 EDT 2007}
}
  • The velocity dependence of the stopping power of a two-dimensional noninteracting electron gas for heavy in-plane ions is calculated. The transport cross section required in the kinetic treatment is determined for a bare Coulomb potential. Detailed analytical and illustrative numerical results are derived. The problem of screening is also discussed.
  • Measurements of stopping powers for several diatomic ions are presented and compared to values derived from well known wake models. While independently determined wake forces can be superposed to calculate correctly the stopping forces on light fast ions, such as H/sub 2//sup +/, the method appears to be invalid for slower, more highly charged N/sub 2//sup +/ ions. To include non-linear terms in the interaction wake charge distributions must be determined for pairs of ionic cores. To avoid the complexities of a proper quantum mechanical treatment a semi-classical calculation of free electron scattering by two screened ionic cores was usedmore » to determine the stopping forces. While a quantum mechanical calculation is needed to obtain a definitive result the semi-classical calculation provides qualitative agreement with experiment for 3 MeV N/sub 2//sup +/ ions in carbon.« less
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  • We reconsider the results of Lontano and Raimondi [Phys. Rev. E {bold 51}, R2755 (1995)] within the full random-phase approximation. We show that the correlation and also velocity dispersion of the cluster ions enhance and reduce the stopping power, respectively. Nevertheless, the enhancement of energy losses due to ionic correlation is much stronger than that obtained by Lontano and Raimondi, and furthermore, the projectile velocity dependence of the stopping power is strictly monotonic, presenting no oscillations. We also did not obtain negative values for the cluster stopping power, as did Lontano and Raimondi. {copyright} {ital 1997} {ital The American Physicalmore » Society}« less