2011
DOI: 10.1103/physrevb.84.165428
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Band structure effects in Auger neutralization of He ions at metal surfaces

Abstract: A comparative study of Auger neutralization (AN) of He ions at noble metal surfaces is presented in order to reveal how the electronic structure of the sample influences this charge exchange process. Comparison of calculated ion fractions to experimental data obtained in low energy ion scattering (LEIS) shows that good agreement is achieved only if the relevant aspects of the He-metal interaction are properly taken into consideration. For instance AN depends sensitively on the distance-dependent position of th… Show more

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Cited by 21 publications
(27 citation statements)
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“…This behavior indicates that in this regime, neutralization is exclusively due to Auger neutralization (AN). The characteristic velocity v c is significantly higher for Pt (220.000 m/s) than for Ag (140.000 m/s); this can be understood as a band structure effect in Auger neutralization [28]. For Pt, E th is considerably lower than for Ag, i.e., 700 eV for Pt, compared to 1200 eV for Ag.…”
Section: Resultsmentioning
confidence: 95%
“…This behavior indicates that in this regime, neutralization is exclusively due to Auger neutralization (AN). The characteristic velocity v c is significantly higher for Pt (220.000 m/s) than for Ag (140.000 m/s); this can be understood as a band structure effect in Auger neutralization [28]. For Pt, E th is considerably lower than for Ag, i.e., 700 eV for Pt, compared to 1200 eV for Ag.…”
Section: Resultsmentioning
confidence: 95%
“…Several such calculations have been performed for jellium-model wave functions, but this approach would in turn not provide a good description for a semiconductor, nor does it allow us to include the electronic structure of the chosen surface. Gloebl et al [21,22] and Valdès et al [23] did calculate the Auger neutralization rate by considering the matrix elements for the neutralization using a linear combination of atomic orbitals (LCAO) and various distances and positions of an incoming He + ion on several metals and Ge. The electronic response of the surface was modeled using the response function, once again calculated from the jellium model.…”
Section: A Hagstrum's Modelmentioning
confidence: 99%
“…Fig. 13 shows the Auger rates for He on Cu(111), Ag (111) and Au(111) surfaces on-top position [140,141]. The qualitative behavior of the three metals is very similar.…”
Section: Results: Noble Metal Surfacesmentioning
confidence: 94%
“…29 ion fractions for three crystal orientations of Cu are compared [140]. In the simulations, the He level was set to -20.5 eV with respect to the Fermi level which results in almost perfect agreement with the experimental data for the polycrystalline surface.…”
Section: Leis Regimementioning
confidence: 88%