Forward–backward correlated secondary electron emission depending on the emergence angle of 1MeV/u light ions

Ogawa, H.; Amano, Shigeru; Ishii, K.; Kaneko, T.

doi:10.1016/j.nimb.2014.09.025

Cited by 3 publications

(1 citation statement)

References 23 publications

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“…Second, the transport of the emitted electrons through the solid volume potentially leads to other electron excitation or ionization events and finally, the transmission of the electron through the surface barrier. Most experimental measurements and theoretical calculations focus on the total electron emission yield γ (the average number of emitted electrons per incident Backscattered electron emission after proton impact on gold nanoparticles with and without polymer shell coating particle) (Billebaud et al 1996, Ogawa et al 2003, Dingfelder et al 2008, Toburen et al 2010, Ogawa et al 2015. γ is considered to be proportional to the electronic stopping power S e :…”

Section: Introductionmentioning

confidence: 99%

Backscattered electron emission after proton impact on gold nanoparticles with and without polymer shell coating

Hespeels¹,

Heuskin²,

Tabarrant³

et al. 2019

Phys. Med. Biol.

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This work aims at measuring experimentally proton induced secondary electron energy spectra after interaction with gold nano particles (GNPs) and polymer-coated GNPs. Backscattered electron energy spectra were collected over a 0 to 1000 eV energy range using a retarding field analyzer (RFA). This paper presents the spectra obtained for proton beam energies of 0.5 and 2 MeV and diameter 2.5 and 3.8 nm GNPs. The spectra were also measured for 3.8 nm GNPs after 5 and 10 MeV proton irradiations. GNPs were deposited on a 100 nm carbon film. Each experimental spectrum was compared with dedicated simulations based on existing numerical models used in the TRAX and Geant4 Monte Carlo codes.For 100 nm carbon target, good agreement between experimental, TRAX and Geant4 simulation results can be observed.For 3.8 nm GNPs, the TRAX simulations reproduce with good agreement the electron energy spectra produced after 0.5, 2, 5 and 10 MeV proton irradiations, while Geant4 spectra display a lower secondary electron yield at low energy (<600 eV) for all the studied energies. This underestimation can mostly be explained by the 790 eV threshold applied in the condensed history model used by Geant4 which impacts the secondary electron energy distribution. Results obtained for carbon and gold targets highlight the impact of the secondary electron production threshold for proton ionization process considered in condensed history models.The experimental results demonstrate that the single interaction approach used in TRAX is adapted to reproduce secondary electron emission from GNPs. On the other hand, the standard electron generation threshold implement in G4BetheBlochModel and G4BraggModel condensedhistory models used in Geant4 is not adapted to reproduce low energy electron emission in gold targets.Finally, the results highlight that the GNP coating leads to a decrease of the electron yield and mostly affects low energy electrons (<500 eV) emitted from GNPs.

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Section: Introductionmentioning

confidence: 99%

Backscattered electron emission after proton impact on gold nanoparticles with and without polymer shell coating

Hespeels¹,

Heuskin²,

Tabarrant³

et al. 2019

Phys. Med. Biol.

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

Hespeels

Heuskin

Scifoni

et al. 2017

Nuclear Instruments and Methods in Physics Research Section B:

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SECONDARY ELECTRON EMISSION INDUCED BY α-PARTICLES FROM Mg-MgO LAYERS

Zhurenko¹,

Kononenko²,

Mahotka³

et al. 2019

Problems of Atomic Science and Technology

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The paper presents the results of experimental study of forward and backward electron emission induced by α-particles from the deposited film of magnesium. It was shown that during the deposition of magnesium in residual gas atmosphere the deposited film contained a large amount of MgO component, which makes it possible to consider the resulting structure as Mg-MgO. The presence of magnesium oxide on the surface of the target and the collector leads to the fact that the previously obtained dependence of the ratio of forward and backward electron yields on specific energy loss of the ion for various metals is not applicable in the case of deposited magnesium. The differences are explained by the specificity of the emission from magnesium in the presence of a significant amount of MgO. The results obtained can be used to detect MgO on the surface of a magnesium substrate. It was shown the differences in the experimental data for the bulk magnesium collector and the collector with deposited magnesium layer

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Forward–backward correlated secondary electron emission depending on the emergence angle of 1MeV/u light ions

Cited by 3 publications

References 23 publications

Backscattered electron emission after proton impact on gold nanoparticles with and without polymer shell coating

Backscattered electron emission after proton impact on gold nanoparticles with and without polymer shell coating

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

SECONDARY ELECTRON EMISSION INDUCED BY α-PARTICLES FROM Mg-MgO LAYERS

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