Reflection Electron Energy Loss Spectra beyond the optical limit

被引：2

作者：

Calliari, Lucia ^{[1
,2
]}

Dapor, Maurizio ^{[1
,2
]}

Garberoglio, Giovanni ^{[1
,2
]}

Fanchenko, Sergey ^{[3
]}

机构：

[1] European Ctr Theoret Studies Nucl Phys & Related, I-38123 Trento, Italy

[2] Ist Nazl Fis Nucl, Trento Inst Fundamental Phys & Applicat, I-38123 Trento, Italy

[3] Kurchatov Inst, Natl Res Ctr, Moscow 123182, Russia

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS | 2015年 / 352卷

关键词：

Inelastic scattering; Electron energy loss; Monte Carlo; Plasmon energy dispersion; Plasmon damping dispersion; BETHE SURFACE; SPECTROSCOPY; METALS; DEPENDENCE; SOLIDS; WATER; SI;

D O I：

10.1016/j.nimb.2014.11.106

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

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. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：171 / 175

页数：5

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