Electron inelastic mean free paths in biological matter based on dielectric theory and local-field corrections

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Title: Electron inelastic mean free paths in biological matter based on dielectric theory and local-field corrections
Authors: Emfietzoglou, Dimitris | Kyriakou, Ioanna | Abril, Isabel | García Molina, Rafael | Petsalakis, I.D. | Nikjoo, Hooshang | Pathak, A.
Research Group/s: Interacción de Partículas Cargadas con la Materia
Center, Department or Service: Universidad de Alicante. Departamento de Física Aplicada
Keywords: Inelastic mean free path | Dielectric theory | Local-field corrections | Biological materials | Water
Knowledge Area: Física Aplicada
Issue Date: 20-Nov-2008
Publisher: Elsevier
Citation: EMFIETZOGLOU, D., et al. “Electron inelastic mean free paths in biological matter based on dielectric theory and local-field corrections”. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. Vol. 267, No. 1 (Jan. 2009). ISSN 0168-583X, pp. 45-52
Abstract: The inelastic mean free path (IMFP) of electrons with energies up to a few keV is calculated from the dielectric electron-gas theory for densities corresponding to those of biological matter. The effect of the many-body local-field correction on the Lindhard dielectric response function is examined using some of the available analytical approximations to its static limit. We have tested the performance of several Hubbard-type local-field corrections along with the formula proposed by Corradini and co-workers [M. Corradini, R. Del Sole, G. Onida, M. Palumno, Phys. Rev. B 57 (1998) 14569] which is extensively used in connection with the exchange-correlation kernel of time-dependent density functional theory. It is shown that the Lindhard dielectric function provides reasonable estimates of electron IMFPs below about 50 eV, where the majority of semi-empirical dielectric calculations based on the extended-optical-data methodology fail. The use of LFC results in a sizeable reduction of the IMFP which, at low energies, may reach ∼20%.
Sponsor: DE and IK acknowledge financial support by the European Union FP7 ANTICARB (HEALTH-F2-2008-201587) research programme and by an internal grand from the Research Committee of the University of Ioannina (Grant No. 80037). IA and RGM acknowledge financial support by the Spanish Ministerio de Educación y Ciencia (Projects FIS2006-13309-C02-01 and FIS2006-13309-C02-02).
URI: http://hdl.handle.net/10045/25432
ISSN: 0168-583X (Print) | 1872-9584 (Online)
DOI: 10.1016/j.nimb.2008.11.008
Language: eng
Type: info:eu-repo/semantics/article
Peer Review: si
Publisher version: http://dx.doi.org/10.1016/j.nimb.2008.11.008
Appears in Collections:INV - IPCM - Artículos de Revistas

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