Theoretical study of the charge transfer and electron emission in the scattering of He+ by an AlF3 surface

Experimental results of electron emission from surfaces of aluminum fluoride impacted by keV noble gas ions (He+, Ne+, Ar+) show a high-energy structure that increases in intensity with ion energy in the case of He+ and Ar+ and is nearly independent on the impact energy for Ne+ ions. It is also obse...

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Bibliographic Details
Published in:Physical review. B 2017-08, Vol.96 (7)
Main Authors: Iglesias-García, A, González, C, Goldberg, E C
Format: Article
Language:English
Subjects:
Aluminum fluorides
Argon
Charge transfer
Electron emission
Electrons
Emission analysis
Energy
Fluorides
Insulators
Metal fluorides
Metal surfaces
Neon
Rare gases
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Summary:Experimental results of electron emission from surfaces of aluminum fluoride impacted by keV noble gas ions (He+, Ne+, Ar+) show a high-energy structure that increases in intensity with ion energy in the case of He+ and Ar+ and is nearly independent on the impact energy for Ne+ ions. It is also observed that this high-energy secondary electron peak is less pronounced in the case of impact by Ar+. While ion-induced electron emission in metal surfaces is relatively well understood, in the case of wide band-gap insulators, such as metal fluorides, the nature of high-energy excitations is still an open question. In this work, we propose a mechanism of high-energy electron emission strongly linked to the ion neutralization process and the collision induced excitation of the electrons in the solid.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.96.075428