Charge exchange in atom-surface collisions

Los, J.; Geerlings, J.J.C.

doi:10.1016/0370-1573(90)90104-a

Cited by 511 publications

(220 citation statements)

References 119 publications

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“…When an alkali-metal atomic particle is in the vicinity of a surface, its ionization level shifts towards the Fermi level of the solid due to the interaction with its image charge, and it also broadens due to overlap of the projectile atomic level and surface wave functions [32]. In the resonant charge transfer (RCT) model, which is typically used to describe alkali-surface interactions, electrons tunnel between the projectile and the solid through a non-adiabatic process, and the neutralization probability is determined along the outgoing trajectory while the projectile is still within a few Å's of the surface.…”

Section: Low Energy Ion Scattering (Leis) Is An Experimental Techniqumentioning

confidence: 99%

Spatial distribution of topological surface state electrons in Bi2Te3 probed by low-energy Na+ ion scattering

2018

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Bi 2 Se 3 is a topological insulator whose unique properties result from topological surface states (TSS) in the band gap. Low energy ion scattering can determine the properties of the outermost few atomic layers of a solid. The deposition of Cs helps to reveal that the neutralization of Na + is larger when scattered from surface Se than from Bi. This is caused by the spatial redistribution of the conductive charges in the TSS, which are primarily positioned between the first and second atomic layers. This provides direct experimental evidence of the spatial distribution of the TSS electrons.

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Section: Low Energy Ion Scattering (Leis) Is An Experimental Techniqumentioning

confidence: 99%

Spatial distribution of topological surface state electrons in Bi2Te3 probed by low-energy Na+ ion scattering

2018

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“…This is consistent with the prediction of the RCT model that the neutral fraction should change in the opposite direction as the work function. 2 A striking feature of Fig. 4͑b͒, however, is that the I SSP neutral fractions are considerably larger than those of the Ni SSP over the entire iodine coverage range.…”

Section: Resultsmentioning

confidence: 85%

Effects of adsorbates on charge exchange in Li+ ion scattering from Ni(100)

Yang

Yarmoff

2003

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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Resonant charge transfer during the backscattering of 3.0 keV Li ϩ from hydrogen-and iodine-covered Ni͑100͒ is probed with time-of-flight spectroscopy. Hydrogen adsorption on Ni͑100͒ induces only a small increase of the surface work function and the neutralization probabilities for backscattered Li are not significantly affected. Iodine adsorbs with some net negative charge, so that a dipole directed into the surface is expected. Such a dipole would increase the work function thereby decreasing the neutralization probability. Iodine adsorption decreases the work function of Ni͑100͒, however, and the neutralization probabilities for Li scattered from the iodine sites are always larger than for scattering from nickel sites. These results suggest that the local charge density associated with adsorbed iodine is not uniform.

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“…The shape of the work function curves are roughly ''mirrored'' in the neutral fraction curves, which is consistent with the prediction of the RCT model that the neutral fraction goes in the opposite direction as the work function change. 15 A surprising feature of the data, however, is that the I SSP neutral fractions are considerably larger than those of the Fe SSP over the entire iodine exposure range. 22 Similar results are found for bromine adsorption on Fe͑110͒, as shown in Fig.…”

Section: B Exposure Dependence Of the Neutral Fractionmentioning

confidence: 81%

“…͑1͒ for the analysis of our data by comparing, in certain instances, the N obtained from Eq. ͑1͒ to the N obtained by a complete solution of the Newns-Anderson Hamiltonian in the independent particle picture 15,42,43 and found them to be comparable.…”

Section: Semiquantitative Theoretical Estimatementioning

confidence: 99%

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Internal electronic structure of adatoms on Fe(110) and Fe(100) surfaces: A low-energyLi+scattering study

2004

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The neutralization of 400-3000 eV 7 Li ϩ ions scattered from clean and adsorbate-covered Fe͑110͒ and Fe͑100͒ surfaces was measured with time-of-flight spectroscopy. Li singly scattered from bromine, iodine, and cesium adatoms has a consistently larger neutral fraction than that for scattered from substrate sites. This suggests that the local electrostatic potential directly above these adatoms is reduced from that of the clean substrate. The neutral fraction of Li scattered from halogen adatoms is surprising in that it decreases as the emission angle moves off-normal, yet increases in the usual manner for cesium and silver adatoms. This indicates that the charge distribution associated with a halogen adsorbate is nonuniform, most likely due to internal polarization. A semiquantitative theoretical analysis shows that a nonuniform internal electron density would give rise to the observed behavior. The polarization of halogen adatoms is likely responsible for anomalous work function changes observed previously. Alkali-ion scattering is shown to be an effective tool for detecting the internal electronic structure of an adatom.

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Charge exchange in atom-surface collisions

Cited by 511 publications

References 119 publications

Spatial distribution of topological surface state electrons in Bi2Te3 probed by low-energy Na+ ion scattering

Spatial distribution of topological surface state electrons in Bi2Te3 probed by low-energy Na+ ion scattering

Effects of adsorbates on charge exchange in Li+ ion scattering from Ni(100)

Internal electronic structure of adatoms on Fe(110) and Fe(100) surfaces: A low-energyLi+scattering study

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