Backscattered electron emission after proton impact on carbon and gold films: Experiments and simulations

This work aims at measuring the proton induced secondary electron energy spectra from nanometer thin films. Backscattered electron energy spectra were measured within an energy range from 0 to 600eV using a Retarding Field Analyser (RFA). This paper presents energy spectra obtained for proton (0.5Me...

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Published inNuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms Vol. 401; pp. 8 - 17
Main Authors Hespeels, F., Heuskin, A.C., Scifoni, E., Kraemer, M., Lucas, S.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 15.06.2017
Subjects
Carbon target
Electron emission
Geant4
Gold target
Low-energy electron
Monte Carlo
Proton beam
TRAX
TRAX
Proton beam
Monte Carlo
Carbon target
Electron emission
Low-energy electron
Gold target
Geant4
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Summary:This work aims at measuring the proton induced secondary electron energy spectra from nanometer thin films. Backscattered electron energy spectra were measured within an energy range from 0 to 600eV using a Retarding Field Analyser (RFA). This paper presents energy spectra obtained for proton (0.5MeV; 1MeV; 1.5MeV; 2MeV) irradiation of thin carbon films (50 and 100nm thick) and thin gold film (200nm). These experimental spectra were compared with Monte Carlo simulations based on TRAX code and Geant4 simulation toolkit. Good agreement between experimental, TRAX and Geant4 results were observed for the carbon target. For the gold target, we report major differences between both Monte Carlo environments. Limitation of Geant4 models for low energy electron emission was highlighted. On the contrary, TRAX simulations present encouraging results for the modeling of low-energy electron emission from gold target.
ISSN:0168-583X
1872-9584
DOI:10.1016/j.nimb.2017.04.032