Electron Emission from Surfaces Mediated by Ion-Induced Plasmon Excitation

Baragiola, R. A.; Monreal, R.

doi:10.1007/3-540-70789-1_6

Cited by 6 publications

(9 citation statements)

References 73 publications

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“…It is well established that plasmon excitations play an important role in the interaction of ions and metallic surfaces, [ 14–16 ] so any attempt to calculate

\gamma

for a broad range of metals has to include a suitable implementation of these collective electron excitations. This also becomes clear when comparing the results based on the model described in the previous section for He + and Ne + incident on Mg(100) with the experimental result of Baragiola and Dukes [ 14 ] in Figure 2.…”

Section: Plasmonic Excitationsmentioning

confidence: 99%

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Plasmonic effects in the neutralization of slow ions at a metallic surface

Bercx,

Mayda,

Depla

et al. 2023

Contributions to Plasma Physics

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Secondary electron emission is an important process that plays a significant role in several plasma‐related applications. As measuring the secondary electron yield experimentally is very challenging, quantitative modelling of this process to obtain reliable yield data is critical as input for higher‐scale simulations. Here, we build upon our previous work combining density functional theory calculations with a model originally developed by Hagstrum to extend its application to metallic surfaces. As plasmonic effects play a much more important role in the secondary electron emission mechanism for metals, we introduce an approach based on Poisson point processes to include both surface and bulk plasmon excitations to the process. The resulting model is able to reproduce the yield spectra of several available experimental results quite well but requires the introduction of global fitting parameters, which describe the strength of the plasmon interactions. Finally, we use an in‐house developed workflow to calculate the electron yield for a list of elemental surfaces spanning the periodic table to produce an extensive data set for the community and compare our results with more simplified approaches from the literature.

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“…It is well established that plasmon excitations play an important role in the interaction of ions and metallic surfaces, [ 14–16 ] so any attempt to calculate

\gamma

Section: Plasmonic Excitationsmentioning

confidence: 99%

“…This involves the inclusion of plasmonic effects, which are expected to have a significant influence on the IIEE yield of metals. [14][15][16] After comparing the computed results with available experimental spectra, we apply the final model to a whole range of elemental surfaces spanning the periodic table.…”

Section: Introductionmentioning

confidence: 99%

Plasmonic effects in the neutralization of slow ions at a metallic surface

Bercx,

Mayda,

Depla

et al. 2023

Contributions to Plasma Physics

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“…Finally, electron emission can result from the decay of plasmons excited through either kinetic or potential energy transfer processes [60,61]. Experimental characterization of this mechanism has proved elusive because of challenges in isolating it from other electron emission processes [62].…”

Section: Simulated Microscopy Imagesmentioning

confidence: 99%

First-principles simulation of light-ion microscopy of graphene

Kononov¹,

Alexandra²,

Baczewski³

et al. 2022

2D Mater.

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The extreme sensitivity of 2D materials to defects and nanostructure requires precise imaging techniques to verify presence of desirable and absence of undesirable features in the atomic geometry. Helium-ion beams have emerged as a promising materials imaging tool, achieving up to 20 times higher resolution and 10 times larger depth-of-field than conventional or environmental scanning electron microscopes. Here, we offer first-principles theoretical insights to advance ion-beam imaging of atomically thin materials by performing real-time time-dependent density functional theory simulations of single impacts of 10–200 keV light ions in free-standing graphene. We predict that detecting electrons emitted from the back of the material (the side from which the ion exits) would result in up to three times higher signal and up to five times higher contrast images, making 2D materials especially compelling targets for ion-beam microscopy. This predicted superiority of exit-side emission likely arises from anisotropic kinetic emission. The charge induced in the graphene equilibrates on a sub-fs time scale, leading to only slight disturbances in the carbon lattice that are unlikely to damage the atomic structure for any of the beam parameters investigated here.

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“…For a discussion of the surface plasmon-assisted neutralization mechanism and its connection to electron emission, we refer the reader to Ref. [123] and references therein.…”

Section: Jellium Modelmentioning

confidence: 99%

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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Electron Emission from Surfaces Mediated by Ion-Induced Plasmon Excitation

Cited by 6 publications

References 73 publications

Plasmonic effects in the neutralization of slow ions at a metallic surface

Plasmonic effects in the neutralization of slow ions at a metallic surface

First-principles simulation of light-ion microscopy of graphene

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

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