Artículo
Band structure effects in the energy loss of low-energy protons and deuterons in thin films of Pt
Celedón, C E.; Sánchez, E. A.; Salazar Alarcón, Leonardo
; Guimpel, Julio Juan
; Cortés, A.; Vargas, P.; Arista, Nestor Ricardo
Fecha de publicación:
10/2015
Editorial:
Elsevier Science
Revista:
Beam Interactions with Materials and Atoms
ISSN:
0168-583X
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We have investigated experimentally and by computer simulations the energy-loss and angular distribution of low energy (E<10 keV) protons and deuterons transmitted through thin polycrystalline platinum films. The experimental results show significant deviations from the expected velocity dependence of the stopping power in the range of very low energies with respect to the predictions of the Density Functional Theory for a jellium model. This behavior is similar to those observed in other transition metals such as Cu, Ag and Au, but different from the linear dependence recently observed in another transition metal, Pd, which belongs to the same Group of Pt in the Periodic Table. These differences are analyzed in term of the properties of the electronic bands corresponding to Pt and Pd, represented in terms of the corresponding density of states. The present experiments include also a detailed study of the angular dependence of the energy loss and the angular distributions of transmitted protons and deuterons. The results are compared with computer simulations based on the Monte Carlo method and with a theoretical model that evaluates the contributions of elastic collisions, path length effects in the inelastic energy losses, and the effects of the foil roughness. The results of the analysis obtained from these various approaches provide a consistent and comprehensive description of the experimental findings.
Palabras clave:
Band Structure
,
Pt
,
Stopping Power
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Articulos(CCT - PATAGONIA NORTE)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Citación
Celedón, C E.; Sánchez, E. A.; Salazar Alarcón, Leonardo; Guimpel, Julio Juan; Cortés, A.; et al.; Band structure effects in the energy loss of low-energy protons and deuterons in thin films of Pt; Elsevier Science; Beam Interactions with Materials and Atoms; 360; 10-2015; 103-110
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