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

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Títol: Calculation of energy-loss straggling of C, Al, Si, and Cu for fast H, He, and Li ions
Autors: Montanari, C.C. | Miraglia, J.E. | Heredia-Avalos, Santiago | García Molina, Rafael | Abril, Isabel
Grups d'investigació o GITE: Interacción de Partículas Cargadas con la Materia
Centre, Departament o Servei: Universidad de Alicante. Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal | Universidad de Alicante. Departamento de Física Aplicada
Paraules clau: Energy loss straggling | Dielectric formalism | Swift ions
Àrees de coneixement: Física Aplicada
Data de publicació: 20-de febrer-2007
Editor: American Physical Society
Citació bibliogràfica: MONTANARI, 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. 022903-1/11
Resum: We 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 energies.
Patrocinadors: This 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 grant.
ISSN: 1050-2947 (Print) | 1094-1622 (Online)
DOI: 10.1103/PhysRevA.75.022903
Idioma: eng
Tipus: info:eu-repo/semantics/article
Drets: © 2007 The American Physical Society
Revisió científica: si
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