Energy Loss Function of Solids Assessed by Ion Beam Energy-Loss Measurements: Practical Application to Ta2O5
| Autor: | Rafael Garcia-Molina, Chiara D. Nascimento, R. C. Fadanelli, Moni Behar, Luiz Carlos Camargo Miranda Nagamine, Néstor R. Arista, Maarten Vos, Isabel Abril |
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| Přispěvatelé: | Universidad de Alicante. Departamento de Física Aplicada, Interacción de Partículas Cargadas con la Materia |
| Rok vydání: | 2015 |
| Předmět: |
Energy loss function
Ion beam Proton Chemistry Electron energy loss spectroscopy Electron Dielectric Rutherford backscattering spectrometry Inelastic mean free path Surfaces Coatings and Films Electronic Optical and Magnetic Materials Ion General Energy Ion beams Física Aplicada Ta2O5 Physical and Theoretical Chemistry Atomic physics |
| Zdroj: | RUA. Repositorio Institucional de la Universidad de Alicante Universidad de Alicante (UA) |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/acs.jpcc.5b04292 |
| Popis: | We present a study where the energy loss function of Ta2O5, initially derived in the optical limit for a limited region of excitation energies from reflection electron energy loss spectroscopy (REELS) measurements, was improved and extended to the whole momentum and energy excitation region through a suitable theoretical analysis using the Mermin dielectric function and requiring the fulfillment of physically motivated restrictions, such as the f- and KK-sum rules. The material stopping cross section (SCS) and energy-loss straggling measured for 300–2000 keV proton and 200–6000 keV helium ion beams by means of Rutherford backscattering spectrometry (RBS) were compared to the same quantities calculated in the dielectric framework, showing an excellent agreement, which is used to judge the reliability of the Ta2O5 energy loss function. Based on this assessment, we have also predicted the inelastic mean free path and the SCS of energetic electrons in Ta2O5. We acknowledge financial support from the Brazilian agencies Coordinação de Aperfeiçoamento de Pessoal de Nivel Superior (CAPES), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) and PRONEX-FAPERGS, as well as the Australian Research Council and the Spanish Ministerio de Economía y Competitividad (Project FIS2014-58849-P). |
| Databáze: | OpenAIRE |
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