Ground- and excited-state scattering potentials for the stopping of protons in an electron gas
| Autor: | Gregor Schiwietz, Natalia E. Koval, Néstor R. Arista, Pedro Luis Grande, Andrei G. Borisov, R. C. Fadanelli, R. Díez Muiño, F. Matias |
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| Přispěvatelé: | Universidad del País Vasco, Conselho Nacional das Fundaçôes Estaduais de Amparo à Pesquisa (Brasil), Alexander von Humboldt Foundation, Eusko Jaurlaritza, Ministerio de Economía y Competitividad (España), Fundações de Amparo à Pesquisa (Brasil), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Brasil), Institut des Sciences Moléculaires d'Orsay (ISMO), Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Nanophysique et Surfaces, Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2017 |
| Předmět: |
Physics
Free electron model [PHYS]Physics [physics] Espalhamento de íons de energia intermediaria Electron Prótons Condensed Matter Physics 7. Clean energy 01 natural sciences Atomic and Molecular Physics and Optics 010305 fluids & plasmas Ion Energy loss Electron gas Atomic orbital Excited state 0103 physical sciences Stopping power (particle radiation) Atomic physics 010306 general physics Fermi gas Valence electron Stopping power ComputingMilieux_MISCELLANEOUS |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname Repositório Institucional da UFRGS Universidade Federal do Rio Grande do Sul (UFRGS) instacron:UFRGS Journal of Physics B: Atomic, Molecular and Optical Physics Journal of Physics B: Atomic, Molecular and Optical Physics, IOP Publishing, 2017, 50 (18), pp.185201. ⟨10.1088/1361-6455/aa843d⟩ |
| ISSN: | 0953-4075 1361-6455 |
| DOI: | 10.1088/1361-6455/aa843d⟩ |
| Popis: | The self-consistent electron-ion potential V(r) is calculated for H ions in an electron gas system as a function of the projectile energy to model the electronic stopping power for conduction-band electrons. The results show different self-consistent potentials at low projectile-energies, related to different degrees of excitation of the electron cloud surrounding the intruder ion. This behavior can explain the abrupt change of velocity dependent screening-length of the potential found by the use of the extended Friedel sum rule and the possible breakdown of the standard free electron gas model for the electronic stopping at low projectile energies. A dynamical interpolation of V(r) is proposed and used to calculate the stopping power for H interacting with the valence electrons of Al. The results are in good agreement with the TDDFT benchmark calculations as well as with experimental data. We are indebted to the Brazilian agencies CAPES, CNPq and FAPERGS for the partial support of this research project. One of the authors (PLG) acknowledges funding by the Alexander-von-Humboldt foundation. NEK and RDM acknowledge financial support by the Basque Departamento de Educación, Universidades e Investigación, the University of the Basque Country UPV/EHU (Grant No. IT-756-13) and the Spanish Ministerio de Economía y Competitividad (Grants FIS2013-48286-C02-02-P and FIS2016-76471-P). |
| Databáze: | OpenAIRE |
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