Barkas effect in the stopping power for ions with different ionization degrees
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http://hdl.handle.net/10045/39344
Title: | Barkas effect in the stopping power for ions with different ionization degrees |
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Authors: | Archubi, Claudio D. | Abril, Isabel | García Molina, Rafael | Arista, Néstor R. |
Research Group/s: | Interacción de Partículas Cargadas con la Materia |
Center, Department or Service: | Universidad de Alicante. Departamento de Física Aplicada |
Keywords: | Atomic Collisions Solids | Barkas | Stopping | Ions |
Knowledge Area: | Física Aplicada |
Issue Date: | 1-Dec-2013 |
Publisher: | Elsevier |
Citation: | Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 2013, 316: 88-93. doi:10.1016/j.nimb.2013.08.034 |
Abstract: | The Barkas effect in the electronic stopping power for dressed projectiles moving in a free electron gas is studied for a wide range of velocities v . The interaction of the projectile with the target is described using screened interaction potentials, which take into account the self screening due to the projectile bound electrons and the external screening produced by the target electron gas. The Barkas factor is obtained from a classical simulation of the scattering of the target electrons in the potential of the projectile and that of its antiparticle, following the transport cross section model. A large set of numerical simulations were made for different projectiles, degrees of ionization and velocities. We find that the Barkas factor increases at high energies with the number of projectile bound electrons, whereas its velocity dependence changes from the v-3v-3 behavior for bare projectiles to a v-2v-2 behavior for neutral ones. Interesting effects of curve crossings in the Barkas factor at different degrees of ionization as a function of the projectile velocity are observed. A simple scaling law for neutral and fully ionized projectiles is also derived. |
Sponsor: | The work of RGM and IA has been supported by the European Regional Development Fund and the Spanish Ministerio de Economía and Competitividad (Project No. FIS2010-17225). |
URI: | http://hdl.handle.net/10045/39344 |
ISSN: | 0168-583X (Print) | 1872-9584 (Online) |
DOI: | 10.1016/j.nimb.2013.08.034 |
Language: | eng |
Type: | info:eu-repo/semantics/article |
Peer Review: | si |
Publisher version: | http://dx.doi.org/10.1016/j.nimb.2013.08.034 |
Appears in Collections: | INV - IPCM - Artículos de Revistas |
Files in This Item:
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2013_Archubi_etal_NIMB_final.pdf | Versión final (acceso restringido) | 637,3 kB | Adobe PDF | Open Request a copy |
2013_Archubi_etal_NIMB.pdf | Accepted Manuscript (acceso abierto) | 856,69 kB | Adobe PDF | Open Preview |
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