Monte Carlo simulation of kilovolt electron transport in solids
作者:
J. D. Marti´nez,
R. Mayol,
F. Salvat,
期刊:
Journal of Applied Physics
(AIP Available online 1990)
卷期:
Volume 67,
issue 6
页码: 2955-2964
ISSN:0021-8979
年代: 1990
DOI:10.1063/1.345415
出版商: AIP
数据来源: AIP
摘要:
A Monte Carlo procedure to simulate the penetration and energy loss of low‐energy electron beams through solids is presented. Elastic collisions are described by using the method of partial waves for the screened Coulomb field of the nucleus. The atomic charge density is approximated by an analytical expression with parameters determined from the Dirac–Hartree–Fock–Slater self‐consistent density obtained under Wigner–Seitz boundary conditions in order to account for solid‐state effects; exchange effects are also accounted for by an energy‐dependent local correction. Elastic differential cross sections are then easily computed by combining the WKB and Born approximations to evaluate the phase shifts. Inelastic collisions are treated on the basis of a generalized oscillator strength model which gives inelastic mean free paths and stopping powers in good agreement with experimental data. This scattering model is accurate in the energy range from a few hundred eV up to about 50 keV. The reliability of the simulation method is analyzed by comparing simulation results and experimental data from backscattering and transmission measurements.
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