Shower approach in the simulation of ion scattering from solids

Khodyrev, V.A.; Andrzejewski, R.; Rivera de Mena, Antonio; Boerma, D.O. y Prieto, J.E. (2011). Shower approach in the simulation of ion scattering from solids. "Physical Review E", v. 83 (n. 5); pp. 1-14. ISSN 1536-6065. https://doi.org/10.1103/PhysRevE.83.056707.

Descripción

Título: Shower approach in the simulation of ion scattering from solids
Autor/es:
  • Khodyrev, V.A.
  • Andrzejewski, R.
  • Rivera de Mena, Antonio
  • Boerma, D.O.
  • Prieto, J.E.
Tipo de Documento: Artículo
Título de Revista/Publicación: Physical Review E
Fecha: 2011
Volumen: 83
Materias:
Escuela: E.T.S.I. Industriales (UPM)
Departamento: Ingeniería Nuclear [hasta 2014]
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

An efficient approach for the simulation of ion scattering from solids is proposed. For every encountered atom, we take multiple samples of its thermal displacements among those which result in scattering with high probability to finally reach the detector. As a result, the detector is illuminated by intensive “showers,” where each event of detection must be weighted according to the actual probability of the atom displacement. The computational cost of such simulation is orders of magnitude lower than in the direct approach, and a comprehensive analysis of multiple and plural scattering effects becomes possible. We use this method for two purposes. First, the accuracy of the approximate approaches, developed mainly for ion-beam structural analysis, is verified. Second, the possibility to reproduce a wide class of experimental conditions is used to analyze some basic features of ion-solid collisions: the role of double violent collisions in low-energy ion scattering; the origin of the “surface peak” in scattering from amorphous samples; the low-energy tail in the energy spectra of scattered medium-energy ions due to plural scattering; and the degradation of blocking patterns in two-dimensional angular distributions with increasing depth of scattering. As an example of simulation for ions of MeV energies, we verify the time reversibility for channeling and blocking of 1-MeV protons in a W crystal. The possibilities of analysis that our approach offers may be very useful for various applications, in particular, for structural analysis with atomic resolution.

Más información

ID de Registro: 11403
Identificador DC: http://oa.upm.es/11403/
Identificador OAI: oai:oa.upm.es:11403
Identificador DOI: 10.1103/PhysRevE.83.056707
URL Oficial: http://link.aps.org/doi/10.1103/PhysRevE.83.056707
Depositado por: Memoria Investigacion
Depositado el: 25 Jul 2012 11:23
Ultima Modificación: 20 Abr 2016 19:29
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