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Title: Monte Carlo simulation of x-ray spectra generated by kilo-electron-volt electrons
Author: Llovet Ximenes, Xavier
Sorbier, Loïc
Campos, C. S.
Acosta, Eva
Salvat Gavaldà, Francesc
Keywords: Mètode de Montecarlo
Propietats òptiques
Monte Carlo method
Optical properties
Issue Date: 1-Apr-2003
Publisher: American Institute of Physics
Abstract: We present a general algorithm for the simulation of x-ray spectra emitted from targets of arbitrary composition bombarded with kilovolt electron beams. Electron and photon transport is simulated by means of the general-purpose Monte Carlo code PENELOPE, using the standard, detailed simulation scheme. Bremsstrahlung emission is described by using a recently proposed algorithm, in which the energy of emitted photons is sampled from numerical cross-section tables, while the angular distribution of the photons is represented by an analytical expression with parameters determined by fitting benchmark shape functions obtained from partial-wave calculations. Ionization of K and L shells by electron impact is accounted for by means of ionization cross sections calculated from the distorted-wave Born approximation. The relaxation of the excited atoms following the ionization of an inner shell, which proceeds through emission of characteristic x rays and Auger electrons, is simulated until all vacancies have migrated to M and outer shells. For comparison, measurements of x-ray emission spectra generated by 20 keV electrons impinging normally on multiple bulk targets of pure elements, which span the periodic system, have been performed using an electron microprobe. Simulation results are shown to be in close agreement with these measurements.
Note: Reproducció del document publicat a:
It is part of: Journal of Applied Physics, 2003, vol. 93, núm. 7, p. 3844-3851
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ISSN: 0021-8979
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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