Inelastic scattering and energy loss of swift electron beams in biologically relevant materials

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Title: Inelastic scattering and energy loss of swift electron beams in biologically relevant materials
Authors: García Molina, Rafael | Abril, Isabel | Kyriakou, Ioanna | Emfietzoglou, Dimitris
Research Group/s: Interacción de Partículas Cargadas con la Materia
Center, Department or Service: Universidad de Alicante. Departamento de Física Aplicada
Keywords: Electron beam | Inelastic mean free path | Biomaterials
Knowledge Area: Física Aplicada
Issue Date: Jan-2017
Publisher: John Wiley & Sons
Citation: Surface and Interface Analysis. 2017, 49(1): 11-17. doi:10.1002/sia.5947
Abstract: The inelastic mean free path and the stopping power of swift electrons in relevant biomaterials, such as liquid water, DNA, protein, lipid, carotene, sugar, and ice are calculated in the framework of the dielectric formalism. The Mermin Energy Loss Function – Generalized Oscillator Strength model is used to determine the energy loss function of these materials for arbitrary energy and momentum transfer using electron energy-loss spectroscopy data as input. To ensure the consistency of the model, efforts are made so that both the Kramers–Kronig and f-sum rules are fulfilled to better than 2%. Our findings indicate sizeable differences in the inelastic mean free path and stopping power among these biomaterials for low-energy electrons. For example, at 100-eV electron energy, the inelastic mean free path in protein is 25% smaller than for water and around 10% smaller than for the other biomaterials. The stopping power values of protein, DNA, and sugar are rather similar but 20% larger than for water. Taking into account these results, we conclude that electron interactions with living tissues at the nanometric scale cannot be reliably described using only liquid water as the surrogate of the biological target.
Sponsor: The authors acknowledge financial support by the Spanish Ministerio de Economía y Competitividad (Project FIS2014-58849-P). IK and DE acknowledge financial support from the European Union FP7 (Marie Curie Actions) program “RADDEL” (REA grant agreement No. 290023).
ISSN: 0142-2421 (Print) | 1096-9918 (Online)
DOI: 10.1002/sia.5947
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2016 John Wiley & Sons, Ltd.
Peer Review: si
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Appears in Collections:Research funded by the EU
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