Stopping powers for channeled helium ions in silicon using electron densities from bandstructure calculations

P.W.L. Dijk, van, L.J. IJzendoorn, van, M. de Koning, P.A. Bobbert, W. van Haeringen, M.J.A. Voigt, de

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Abstract

Stopping powers for channeled He ions have been calculated with a modified version of the Monte Carlo code LAROSE [J.H. Barrett, Phys. Rev. B 3 (1971) 1527]. The spatial distribution of the valence electron density in Si was obtained from bandstructure calculations. The stopping power was calculated using Lindhard's free-electron gas approach within the framework of the local density approximation. Spatial variations of the electron density along individual trajectories produce a significant contribution to the energy loss distribution. The average energy loss of 4 MeV He ions channeled in the axial 100, 111 and 110 directions have been calculated and compared with measured values. The contribution of the core electrons to the energy loss is investigated by adding the spherically symmetric Hartree-Fock-Slater electron densities of the closed shells to the valence electron density. Calculations show a high energy loss tail in the spectrum qualitatively in agreement with published experimental results.
Original languageEnglish
Pages (from-to)551-555
Number of pages5
JournalNuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms
Volume85
Issue number1-4
DOIs
Publication statusPublished - 1994

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helium ions
stopping power
Carrier concentration
Helium
Energy dissipation
energy dissipation
Silicon
Ions
silicon
valence
Local density approximation
Electron gas
Spatial distribution
free electrons
electron gas
spatial distribution
ions
Trajectories
trajectories
Electrons

Cite this

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title = "Stopping powers for channeled helium ions in silicon using electron densities from bandstructure calculations",
abstract = "Stopping powers for channeled He ions have been calculated with a modified version of the Monte Carlo code LAROSE [J.H. Barrett, Phys. Rev. B 3 (1971) 1527]. The spatial distribution of the valence electron density in Si was obtained from bandstructure calculations. The stopping power was calculated using Lindhard's free-electron gas approach within the framework of the local density approximation. Spatial variations of the electron density along individual trajectories produce a significant contribution to the energy loss distribution. The average energy loss of 4 MeV He ions channeled in the axial 100, 111 and 110 directions have been calculated and compared with measured values. The contribution of the core electrons to the energy loss is investigated by adding the spherically symmetric Hartree-Fock-Slater electron densities of the closed shells to the valence electron density. Calculations show a high energy loss tail in the spectrum qualitatively in agreement with published experimental results.",
author = "{Dijk, van}, P.W.L. and {IJzendoorn, van}, L.J. and {de Koning}, M. and P.A. Bobbert and {van Haeringen}, W. and {Voigt, de}, M.J.A.",
year = "1994",
doi = "10.1016/0168-583X(94)95881-5",
language = "English",
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pages = "551--555",
journal = "Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms",
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TY - JOUR

T1 - Stopping powers for channeled helium ions in silicon using electron densities from bandstructure calculations

AU - Dijk, van, P.W.L.

AU - IJzendoorn, van, L.J.

AU - de Koning, M.

AU - Bobbert, P.A.

AU - van Haeringen, W.

AU - Voigt, de, M.J.A.

PY - 1994

Y1 - 1994

N2 - Stopping powers for channeled He ions have been calculated with a modified version of the Monte Carlo code LAROSE [J.H. Barrett, Phys. Rev. B 3 (1971) 1527]. The spatial distribution of the valence electron density in Si was obtained from bandstructure calculations. The stopping power was calculated using Lindhard's free-electron gas approach within the framework of the local density approximation. Spatial variations of the electron density along individual trajectories produce a significant contribution to the energy loss distribution. The average energy loss of 4 MeV He ions channeled in the axial 100, 111 and 110 directions have been calculated and compared with measured values. The contribution of the core electrons to the energy loss is investigated by adding the spherically symmetric Hartree-Fock-Slater electron densities of the closed shells to the valence electron density. Calculations show a high energy loss tail in the spectrum qualitatively in agreement with published experimental results.

AB - Stopping powers for channeled He ions have been calculated with a modified version of the Monte Carlo code LAROSE [J.H. Barrett, Phys. Rev. B 3 (1971) 1527]. The spatial distribution of the valence electron density in Si was obtained from bandstructure calculations. The stopping power was calculated using Lindhard's free-electron gas approach within the framework of the local density approximation. Spatial variations of the electron density along individual trajectories produce a significant contribution to the energy loss distribution. The average energy loss of 4 MeV He ions channeled in the axial 100, 111 and 110 directions have been calculated and compared with measured values. The contribution of the core electrons to the energy loss is investigated by adding the spherically symmetric Hartree-Fock-Slater electron densities of the closed shells to the valence electron density. Calculations show a high energy loss tail in the spectrum qualitatively in agreement with published experimental results.

U2 - 10.1016/0168-583X(94)95881-5

DO - 10.1016/0168-583X(94)95881-5

M3 - Article

VL - 85

SP - 551

EP - 555

JO - Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms

JF - Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms

SN - 0168-583X

IS - 1-4

ER -