A position-dependent Inverse Inelastic Mean Free Path (IIMFP), calculated according to the Chen-Kwei theory of inelastic scattering, is used to obtain Reflection Electron Energy Loss Spectra (REELS) by a Monte Carlo approach. The basic ingredient of the theory is the energy-loss and momentum-transfer dependent dielectric function, for which we use a plasmon-pole approximation to the Lindhard dielectric function. The dependence on the momentum transfer enters by assuming a proper dispersion relation for the energy loss. Experiments reveal however that, beside energy loss, also plasmon damping disperses with momentum transfer. By comparing measured and calculated REEL spectra, we explore the role of damping dispersion for a quasi-free-electron material like silicon.

Reflection Electron Energy Loss Spectra beyond the optical limit / Calliari, L.; Dapor, M.; Garberoglio, G.; Fanchenko, S.. - In: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION B, BEAM INTERACTIONS WITH MATERIALS AND ATOMS. - ISSN 0168-583X. - 352:(2015), pp. 171-175. [10.1016/j.nimb.2014.11.106]

Reflection Electron Energy Loss Spectra beyond the optical limit

Dapor M.;Garberoglio G.;
2015-01-01

Abstract

A position-dependent Inverse Inelastic Mean Free Path (IIMFP), calculated according to the Chen-Kwei theory of inelastic scattering, is used to obtain Reflection Electron Energy Loss Spectra (REELS) by a Monte Carlo approach. The basic ingredient of the theory is the energy-loss and momentum-transfer dependent dielectric function, for which we use a plasmon-pole approximation to the Lindhard dielectric function. The dependence on the momentum transfer enters by assuming a proper dispersion relation for the energy loss. Experiments reveal however that, beside energy loss, also plasmon damping disperses with momentum transfer. By comparing measured and calculated REEL spectra, we explore the role of damping dispersion for a quasi-free-electron material like silicon.
2015
Calliari, L.; Dapor, M.; Garberoglio, G.; Fanchenko, S.
Reflection Electron Energy Loss Spectra beyond the optical limit / Calliari, L.; Dapor, M.; Garberoglio, G.; Fanchenko, S.. - In: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION B, BEAM INTERACTIONS WITH MATERIALS AND ATOMS. - ISSN 0168-583X. - 352:(2015), pp. 171-175. [10.1016/j.nimb.2014.11.106]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/325758
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