Extended classical over-barrier model for collisions of highly charged ions with conducting and insulating surfaces

Ducrée, Jens; Casali, Fulvio; Thumm, Uwe

doi:10.1103/physreva.57.338

Cited by 84 publications

(29 citation statements)

References 55 publications

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“…Upon approach of the HCI charge transfer occurs already above the surface from electrons near the Fermi edge (see Fig. 1) [7,8]. The transferred electrons are captured in highly excited Rydberg states.…”

Section: Energy Deposition Of Slow Highly Charged Ionsmentioning

confidence: 99%

Highly charged ion induced nanostructures at surfaces by strong electronic excitations

Wilhelm¹,

El-Said²,

Heller³

et al. 2015

Progress in Surface Science

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a b s t r a c tNanostructure formation by single slow highly charged ion impacts can be associated with high density of electronic excitations at the impact points of the ions. Experimental results show that depending on the target material these electronic excitations may lead to very large desorption yields in the order of a few 1000 atoms per ion or the formation of nanohillocks at the impact site. Even in ultra-thin insulating membranes the formation of nanometer sized pores is observed after ion impact. In this paper, we show recent results on nanostructure formation by highly charged ions and compare them to structures and defects observed after intense electron and light ion irradiation of ionic crystals and graphene. Additional data on energy loss, charge exchange and secondary electron emission of highly charged ions clearly show that the ion charge dominates the defect formation at the surface.

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Section: Energy Deposition Of Slow Highly Charged Ionsmentioning

confidence: 99%

Highly charged ion induced nanostructures at surfaces by strong electronic excitations

Wilhelm¹,

El-Said²,

Heller³

et al. 2015

Progress in Surface Science

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“…As a consequence, a basically neutral atom is formed with a dominant occupation of outer electronic shells, a so called "hollow atom" [1,2,6]. The formation sequence of those atoms is well described by a classical overbarrier approach [5,7,8], as tested by effects of the image charge on projectile trajectories [9][10][11][12]. These processes take place in an interval of distances starting from some 10 a.u.…”

mentioning

confidence: 99%

Spin-Polarized Electrons in Collisions of Multicharged Nitrogen Ions with a Magnetized Fe(001) Surface

2001

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We report on the first spin-resolved energy spectra for the emission of electrons during grazing scattering of 150 keV multicharged nitrogen ions from a magnetized Fe(001) surface. A substantial spin polarization for KLL Auger electrons emitted in the final stage of the neutralization sequence during the interaction of multicharged ions with a metal surface is observed. We conclude from our data that the projectile L shell is dominantly populated by electrons from the conduction band of the target. For low energy electrons we find an increase of their spin polarization with an increase of the projectile charge.

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“…The potential energies are deposited on the target surface to excite and ionize the target atom. On the other hand, because of its image-charge, the projectile is accelerated, corresponding to a kinetic energy gain ΔE given by [7] 3 2…”

Section: Figurementioning

confidence: 99%

X-ray spectra induced by 129Xe q+ impacting the metal surface

Zhang

Xiao

Yang

et al. 2008

Sci. China Ser. G-Phys. Mech. Astron.

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Using the slow highly charged ions 129 Xe q+ (q = 25, 26, 27; initial kinetic T 0 ≤4.65 keV/a.u.) to impact Au surface, the Au atomic Mα characteristic X-ray spectrum is induced. The result shows that as long as the charge state of projectile is high enough, the heavy atomic characteristic X-ray can be effectively excited even though the incident beam is very weak (nA magnitude), and the X-ray yield per ion is in the order of 10 −8 and increases with the kinetic energy and potential energy of projectile. By measuring the Au Mα-X-ray spectra, Au atomic N-level lifetime is estimated at about 1.33×10 −18 s based on Heisenberg uncertainty relation.slow highly charged ions, characteristic X-ray, level lifetimeThe intensity and excitation condition of atomic characteristic X-rays become very important as the studies on simulation laboratory astrophysics and plasma progress [1][2][3] . Atomic characteristic X-ray spectra play key roles in the study of element abundance, electron density, plasma physics and astrophysics. The X-rays of plasma emission are found in the activity of late-type and supernova and the process of celestial bodies motion, such as nucleons interaction of active galaxy and collapsed stellar [4,5] . By measuring X-ray spectrum, such physical processes as the temperature, density, component element and ionic state of plasmas can be determined, and then the law of plasma physics and astrophysics can be studied. At the same time, so important is the study on atomic construction and X-ray spectra that can be used to develop high density matter, electron function material and X-ray laser material.Based on Bohr's theory, atomic characteristic X-rays derive from the filling of the holes produced after the inner-shell electrons are excitated. At present, there are various means that can be

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Extended classical over-barrier model for collisions of highly charged ions with conducting and insulating surfaces

Cited by 84 publications

References 55 publications

Highly charged ion induced nanostructures at surfaces by strong electronic excitations

Highly charged ion induced nanostructures at surfaces by strong electronic excitations

Spin-Polarized Electrons in Collisions of Multicharged Nitrogen Ions with a Magnetized Fe(001) Surface

X-ray spectra induced by 129Xe q+ impacting the metal surface

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