Calculation of energy-loss straggling of C, Al, Si, and Cu for fast H, He, and Li ions

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dc.contributorInteracción de Partículas Cargadas con la Materiaes
dc.contributor.authorMontanari, C.C.-
dc.contributor.authorMiraglia, J.E.-
dc.contributor.authorHeredia-Avalos, Santiago-
dc.contributor.authorGarcía Molina, Rafael-
dc.contributor.authorAbril, Isabel-
dc.contributor.otherUniversidad de Alicante. Departamento de Física, Ingeniería de Sistemas y Teoría de la Señales
dc.contributor.otherUniversidad de Alicante. Departamento de Física Aplicadaes
dc.identifier.citationMONTANARI, C.C., et al. “Calculation of energy-loss straggling of C, Al, Si, and Cu for fast H, He, and Li ions”. Physical Review A. Vol. 75, No. 2 (2007). ISSN 1050-2947, pp. 022903-1/11es
dc.identifier.issn1050-2947 (Print)-
dc.identifier.issn1094-1622 (Online)-
dc.description.abstractWe present theoretical calculations of the energy-loss straggling of C, Al, Si, and Cu targets for H, He, and Li ions in the range of intermediate to high energies (0.01–10 MeV∕u). These calculations have been done by employing the dielectric formalism and by considering the different equilibrium charge states of the swift ion inside the solid as a function of its energy. Two different models are used: the Mermin energy-loss functions combined with generalized oscillator strengths (MELF-GOS) and the shellwise application of the local plasma approximation (SLPA). The MELF-GOS describes the target outer-electron excitations through a fitting to experimental data in the optical limit, employing a linear combination of Mermin-type energy-loss functions; the excitations of the inner-shell electrons are taken into account by means of generalized oscillator strengths. The SLPA employs a free-electron-gas model for the target valence electrons and the local density approximation for each shell of target electrons separately by using Hartree-Fock atomic wave functions. The results of the energy-loss straggling obtained by the two independent models show good agreement with the available experimental data. The calculated energy-loss straggling tends at high energies to the Bohr value and takes values below it at intermediate energies. The Bethe-Livingston shoulder (or overshooting) at intermediate energies does not appear in the present calculations. We find that the energy-loss straggling normalized to ZP2 is almost independent of the ion atomic number ZP; therefore, the results for H, He, and Li projectiles in each target can be approximated by a universal curve at high
dc.description.sponsorshipThis work was supported by the Spanish Ministerio de Educación y Ciencia (Projects Nos. BFM2003-04457-C02-01 and BFM2003-04457-C02-02), by the Universidad de Buenos Aires (Project UBACyT), the Argentinian Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), and the Agencia Nacional de Promoción Científica y Tecnológica of Argentina (ANPCyT). S.H.A. thanks Fundación Cajamurcia for a postdoctoral
dc.publisherAmerican Physical Societyes
dc.rights© 2007 The American Physical Societyes
dc.subjectEnergy loss stragglinges
dc.subjectDielectric formalismes
dc.subjectSwift ionses
dc.subject.otherFísica Aplicadaes
dc.titleCalculation of energy-loss straggling of C, Al, Si, and Cu for fast H, He, and Li ionses
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