Dynamics of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">He</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>ion neutralization at clean metal surfaces: Energy- and spin-resolved studies

Lancaster, J. C.; Kontur, F. J.; Walters, G. K.; Dunning, F. B.

doi:10.1103/physrevb.67.115413

Cited by 45 publications

(38 citation statements)

References 24 publications

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“…44 Lancaster et al inferred the level shift from the high-energy cut-off in Auger electron spectra. 9 The effect of the level shift on AN was already discussed in the pioneering work by Hagstrum.…”

Section: B He 1s Level Shiftmentioning

confidence: 95%

“…To proceed one step further toward this aim, the present study investigates how the electronic properties of the target influence AN of He + ions in low energy ion scattering (LEIS) where single scattering events by a large angle prevail. This is not only of fundamental interest but also of vital importance in manifold applications, especially for surface analysis techniques such as Auger electron spectroscopy, [9][10][11][12] ion scattering under grazing incidence, 13 and LEIS. 14,15 LEIS is a common surface analysis technique, which is sensitive to the outermost atomic layers of the sample under investigation when noble gas ions are used as projectiles.…”

Section: Introductionmentioning

confidence: 99%

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Band structure effects in Auger neutralization of He ions at metal surfaces

et al. 2011

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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 the projectile level, which varies significantly when considering different target materials.

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Section: B He 1s Level Shiftmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Band structure effects in Auger neutralization of He ions at metal surfaces

et al. 2011

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“…Other experiments measured the spin-polarization of the electrons emitted when a beam of metastable He (2 3 S) atoms are scattered off metal surfaces [52,53,54]. The basic idea in these experiments is that He * loses resonantly the excited electron at a large distance from the surface, leaving a He + ion with a well defined electron spin.…”

Section: Vc Vmentioning

confidence: 99%

“…For the case of non-magnetic surfaces, the experiments of [53] were analyzed in terms of the exchange interaction at the surface [73,74]. Other experiments [54] have been analyzed in terms of the exchange interaction not at the surface but in the volume of a free-electron gas, including the production of secondary (cascade) electrons and the transport to the surface [75].…”

Section: Theoretical Modelsmentioning

confidence: 99%

“…[145]. The picture was completed by measurements of shifts of the high-energy tails of Auger electron distributions [54] and shifts of angular distributions for incident neutrals and ions for different energies (different distances of neutralization) [152,153], an experiment proposed by More et al [145], that directly measured reduced (and even negative) energy shifts of the He-1s level close to the surface.…”

Section: Comparison Of Theory and Experimentsmentioning

confidence: 99%

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Auger neutralization and ionization processes for charge exchange between slow noble gas atoms and solid surfaces

Monreal

2014

Progress in Surface Science

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Electron and energy transfer processes between an atom or molecule and a surface are extremely important for many applications in physics and chemistry. Therefore a profound understanding of these processes is essential in order to analyze a large variety of physical systems. The microscopic description of the two-electron Auger processes, leading to neutralization/ionization of an ion/neutral atom in front of a solid surface, has been a long-standing problem. It can be dated back to the 1950s when H. D. Hagstrum proposed to use the information contained in the spectrum of the electrons emitted during the neutralization of slow noble gas ions as a surface analytical tool complementing photoelectron spectroscopy. However, only recently a comprehensive description of the Auger neutralization mechanism has been achieved by the combined efforts of theoretical and experimental methods. In this article we review the theoretical models for this problem, stressing how their outcome compare with experimental results. We also analyze the inverse problem of Auger ionization. We emphasize the understanding of the key quantities governing the processes and outline the challenges remaining. This opens new perspectives for future developments of theoretical and experimental work in this field.

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