Target inner-shells contributions to the stopping power and straggling for H and He ions in gold

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Title: Target inner-shells contributions to the stopping power and straggling for H and He ions in gold
Authors: Heredia-Avalos, Santiago | Abril, Isabel | Denton Zanello, Cristian D. | Moreno Marín, Juan Carlos | García Molina, Rafael
Research Group/s: Interacción de Partículas Cargadas con la Materia
Center, Department or Service: Universidad de Alicante. Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal | Universidad de Alicante. Departamento de Física Aplicada
Keywords: Energy loss | Stopping power | Swift ions | Gold | Target inner-shells
Knowledge Area: Física Aplicada
Issue Date: 23-Oct-2007
Publisher: IOP Publishing
Citation: HEREDIA-AVALOS, Santiago, et al. “Target inner-shells contributions to the stopping power and straggling for H and He ions in gold”. Journal of Physics: Condensed Matter. Vol. 19, No. 46 (2007). ISSN 0953-8984, 466205 (8pp)
Abstract: The electronic energy loss of swift H and He ions in gold is studied, paying special attention to the contribution to the projectile energy loss due to the ionization of the target inner-shells. We calculate the stopping power and the energy-loss straggling as a function of the projectile energy, taking into account the different charge states that the projectile can acquire inside the target and using the dielectric formalism. The electronic response of gold is described by the MELF-GOS model, where the excitation of valence and N-shell electrons is characterized by a linear combination of Mermin-type energy-loss functions, whereas the contribution to the projectile energy loss due to the target K-, L-, and M-shell ionization is included through hydrogenic generalized oscillator strengths. Stopping powers and straggling are, respectively, systematically above and below the data in our linear response formulation when H and He ions are below 0.1 MeV/u. Our calculations show that the total contribution of K-, L-, and M-shells to stopping power and straggling is less than 0.5% and 3.5% below 1 MeV/u, respectively. For stopping powers, the contribution of these inner-shells increases to 9% at 10 MeV/u and continues to rise to 20% at 100 MeV/u. For straggling, it increases to 23% at 10 MeV/u and rises to 35% at 100 MeV/u.
Sponsor: This work has been financially supported by the Spanish Ministerio de Educación y Ciencia (Projects Nos FIS2006-13309-C02-01 and FIS2006-13309-C02-02). SHA thanks the Fundación CajaMurcia and the Vicerectorat d’Investigació, Desenvolupament i Innovació de la Universitat d’Alacant for financial support. CDD thanks the Spanish Ministerio de Educación y Ciencia and Generalitat Valenciana for support under the Ramón y Cajal program.
URI: http://hdl.handle.net/10045/25387
ISSN: 0953-8984 (Print) | 1361-648X (Online)
DOI: 10.1088/0953-8984/19/46/466205
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2007 IOP Publishing
Peer Review: si
Publisher version: http://dx.doi.org/10.1088/0953-8984/19/46/466205
Appears in Collections:INV - IPCM - Artículos de Revistas

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