Study on interactions of He atoms and ions with an Al(111) surface

Wethekam, S.; Winter, H.

doi:10.1016/j.nimb.2006.12.079

Cited by 11 publications

(8 citation statements)

References 34 publications

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“…This is motivated by the fact that in the grazing scattering regime ionization of neutral atoms is experimentally seen even at low perpendicular energies, with a threshold in parallel energy of 5 keV for the system He/Al. Earlier experimental results on the ionization of neutral atoms [153,166,167] seemed to agree with theoretical estimates [168] for the existence of a kinetic energy threshold below which AI is forbidden, but a detailed theory have been lacking until recently. 39 …”

Section: Mutielectron Theory Of Auger Ionizationmentioning

confidence: 91%

“…[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%

“…Correlated thermal displacements are included in the simulations within the Debye model at T=300 K, as in Ref. [153]. For the calculation of trajectories for He 0 atoms we made use of a Moliere potential with a screening length modified by O'Connor and Biersack (OCB) [159].…”

Section: Aluminum Surfacesmentioning

confidence: 99%

“…This choice is different from Refs. [152,153], where an interaction potential derived from data for rainbow scattering under axial surface channeling [160] was used. Although being very sensitive to the interaction potential, the rainbow data does not yield enough information for an unequivocal derivation of the potential and, without further input, very different potentials can be constructed from the data.…”

Section: Aluminum Surfacesmentioning

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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Section: Mutielectron Theory Of Auger Ionizationmentioning

confidence: 91%

Section: Comparison Of Theory and Experimentsmentioning

confidence: 99%

Section: Aluminum Surfacesmentioning

confidence: 99%

Section: Aluminum Surfacesmentioning

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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“…This paper is about static mode of Faraday cup. The typical Faraday cup is composed of suppressor grid, shielding case and sensitive electrode [11].…”

Section: Introductionmentioning

confidence: 99%

Study on simulation and experiment of array micro Faraday cup ion detector for FAIMS

Tang

Wang

Zhang

et al. 2010

Sci. China Technol. Sci.

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An array micro Faraday cup ion detector for FAIMS (High-field Asymmetric Waveform Ion Mobility Spectrometry) was introduced, with which the size of the FAIMS system was reduced. With simple structure, good stability, low noise, large measurements range, this detector can work under the condition of atmospheric pressure. The array micro Faraday cup was composed of gate electrode, sensitive electrode and shielding electrode. The sensitive electrode was made of tens of crossing silicon columns with diameter of 200 μm. It was fabricated through typical MEMS technology, which was compatible completely with plane FAIMS. It was shown from FLUENT simulation result that the resistance to gas motion was low and the flow field distribution was helpful for full absorption of the ion in this array design. Through electricity simulation, the method to reduce interference on the detection signal of the micro Faraday cup was given out. Connecting with KEITHLEY 237 ampere meter, the noise level of the array micro Faraday cup was lower than 0.5 pA. The output signal of the acetone sample measured by experiment was about 210 pA. Through contrast experiment, the design parameter of the micro Faraday cup was obtained primarily. This array micro Faraday cup can meet the requirements of the FAIMS system. FAIMS, MEMS, Faraday cup, ion detector, low current Citation:Tang F, Wang X H, Zhang L, et al. Study on simulation and experiment of array micro Faraday cup ion detector for FAIMS.

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Effect of energy loss in the simulation of slow ion scattering by a solid surface

Khalal-Kouache

Aissous

Mekhtiche

et al. 2008

Nuclear Instruments and Methods in Physics Research Section B:

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Study on interactions of He atoms and ions with an Al(111) surface

Cited by 11 publications

References 34 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

Study on simulation and experiment of array micro Faraday cup ion detector for FAIMS

Effect of energy loss in the simulation of slow ion scattering by a solid surface

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