The spatial extent of surface effects on electron inelastic scattering

We calculate the thickness of the surface scattering layer, defined as the region where electron inelastic scattering is affected by the surface, using the semi‐classical treatment of electron energy loss provided by the Chen–Kwei theory. To this end, we consider the depth‐dependent, surface‐related...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Surface and interface analysis 2016-07, Vol.48 (7), p.580-583
Hauptverfasser: Calliari, L., Fanchenko, S.
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:We calculate the thickness of the surface scattering layer, defined as the region where electron inelastic scattering is affected by the surface, using the semi‐classical treatment of electron energy loss provided by the Chen–Kwei theory. To this end, we consider the depth‐dependent, surface‐related contributions to the inverse inelastic mean free path, namely, the excitation of surface plasmons and the reduction in bulk plasmon excitation (Begrenzung effect). We find that surface effects extend further after electrons cross the surface than before they cross it. The ‘pre‐surface thickness’ is given by the ratio of the electron velocity to the plasma frequency, the characteristic decay length for surface effects. All thickness estimates increase linearly with the electron velocity and decrease as (cosα)x with the angle α between the electron trajectory and the surface normal. Copyright © 2015 John Wiley & Sons, Ltd.
ISSN:0142-2421
1096-9918
DOI:10.1002/sia.5884