Auger neutralization rate for slow<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi mathvariant="normal">Ar</mml:mi><mml:mo>+</mml:mo></mml:msup></mml:math>ions in front of KCl(001)

Kimura, Kenji; Tsujioka, T.; Tanaka, Shigetoshi; Nakamoto, Atsushi; Nakajima, K.; Suzuki, Motofumi

doi:10.1103/physreva.70.022901

“…Similar deviations from the classical behavior were also calculated for the 1s state of H [30,31], for excited states of He in front of an Al surface [148], and predicted for other systems [37]. A similar downward shift was found for the ground state of Ar in front of a KCl(001) surface [149].…”

Section: Energy Level Variationsupporting

confidence: 80%

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

Monreal

2014

Preprint

0

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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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“…Similar deviations from the classical behavior were also calculated for the 1s state of H [30,31], for excited states of He in front of an Al surface [148], and predicted for other systems [37]. A similar downward shift was found for the ground state of Ar in front of a KCl(001) surface [149]. Fig.17 shows the diabatic and adiabatic levels for He approaching Al(111) on a top position.…”

Section: Energy Level Variationsupporting

confidence: 77%

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

Monreal

¹

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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“…The latter was an experiment proposed by More et al [26] , that directly measured reduced (and even negative) energy shifts of the ground state energy of He close to the surface. A similar downward shift was also found for the ground state of Ar in front of a KCl (0 0 1) surface [33] . The problem of energy level variation of atoms in front of noble metal surfaces is addressed in section III.…”

Section: Introductionsupporting

confidence: 79%

Effects of the atomic level shift in the Auger neutralization rates of noble metal surfaces

Monreal

¹

,

Goebl

²

,

Primetzhofer

³

et al. 2013

Nuclear Instruments and Methods in Physics Research Section B:

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In this work we compare characteristics of Auger neutralization of He+ ions at noble metal and free-electron metal surfaces. For noble metals, we find that the position of the energy level of He with respect to the Fermi level has a non-negligible influence on the values of the calculated Auger rates through the evaluation of the surface dielectric susceptibility. We conclude that even though our calculated rates are accurate, further theoretical effort is needed to obtain realistic values of the energy level of He in front of these surfaces.

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Auger neutralization rate for slowAr+ions in front of KCl(001)

Cited by 7 publications

References 17 publications

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

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

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

Effects of the atomic level shift in the Auger neutralization rates of noble metal surfaces

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