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Influence of the elastic scattering cross‐section on angle‐resolved reflection electron energy loss spectra of polycrystalline Al, Ni, Pt and Au
Author(s) -
Werner Wolfgang S. M.,
Hayek Markus
Publication year - 1994
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.740220120
Subject(s) - scattering , spectral line , elastic scattering , cross section (physics) , inelastic scattering , atomic physics , reflection (computer programming) , electron energy loss spectroscopy , mott scattering , chemistry , electron , materials science , molecular physics , optics , small angle neutron scattering , physics , neutron scattering , quantum mechanics , astronomy , computer science , programming language
Reflection electron energy loss spectroscopy (REELS) spectra for Al, Ni, Pt and Au were measured in the energy range 300–1500 eV for different scattering geometries. The energy dependence of the loss spectra was found to depend strongly on the shape and the magnitude of the elastic scattering cross‐section. This effect is extremely pronounced in the angle‐resolved spectra, but also persists in the angle‐integrated case. It was moreover observed that the relative intensities of the surface excitations in REELS spectra exhibit a similar dependence on the elastic scattering properties. These experimental observations are in good agreement with MC calculations accounting for elastic scattering through the differential Mott cross‐section and demonstrate that quantitative information regarding the inelastic scattering probability can only be extracted from REELS spectra if the exact shape of the elastic scattering cross‐section is accounted for and a quantitative description of surface excitations is available.