Local work function effects in the neutralization of alkali ions scattered from cesiated surfaces

Geerlings, J.J.C.; Kwakman, L.F.Tz.; Los, J.

doi:10.1016/s0039-6028(87)80359-x

Cited by 103 publications

(27 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The neutralization of low energy alkali ions provides a unique method for measuring the surface local electrostatic potential (LEP) [12][13][14]31]. 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].…”

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

View full text Add to dashboard Cite

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.

show abstract

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

View full text Add to dashboard Cite

show abstract

“…This is consistent with figure 5.5, where the work function below which the resonant neutralisation is possible for the different ions is approximately 1.5 eV lower than expected based on the energy of the level at infinite distance from the surface (see table 5.1). This lower work function compared to the energy of the first excited level is caused by the level shift of the ions near the surface [69,72,73]. The level shift of the first excited levels is of the order of 1-2 eV a few Ångstrom from the surface where the charge state is frozen [24,25].…”

Section: Resonant Neutralisation At Low Work Functionsmentioning

confidence: 99%

Surface analysis of thermionic dispenser cathodes

Cortenraad

Gon

Brongersma

et al. 2002

Applied Surface Science

View full text Add to dashboard Cite

“…This lower work function compared to the energy of the first excited level is caused by the level shift of the ions near the surface. 56,59,60 The shift of the first excited level a few angstrom from the surface where the charge state is frozen is of the order of 1 or 2 eV. 13,14 For RN to take place, the Fermi level has to be near or above the energy of the first excited level at the freezing distance.…”

Section: ͑4͒mentioning

confidence: 99%

Work function dependent neutralization of low-energy noble gas ions

et al. 2002

View full text Add to dashboard Cite

The work function dependence of the neutralization of low-energy He ϩ , Ne ϩ , and Ar ϩ ions was studied by determining the neutralization probability of ions scattered from submonolayer coverages of Ba on W͑110͒ and Re͑0001͒ substrates. At high work functions ͑Ͼ3.5 eV͒, it was found that the dominant neutralization mechanism for noble gas ions with initial energy between 2 and 5 keV scattering from Ba is collision-induced neutralization. The neutralization probability for this mechanism was found to be insensitive to work function changes. We argue that collision-induced neutralization is also the dominant charge transfer process for scattering from other earth-alkali and alkali elements in this energy range, although at lower energies it is expected that Auger neutralization will become important. At work functions below roughly 3.5 eV, resonant neutralization to the first excited level of the noble gas ions occurs in addition to the charge transfer processes operating at high work functions. We show that the additional neutralization at low work functions can be described using resonant charge exchange theory. Due to resonant neutralization, the neutralization probability for noble gas ions increases exponentially with decreasing work function.

show abstract

Local work function effects in the neutralization of alkali ions scattered from cesiated surfaces

Cited by 103 publications

References 15 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

Surface analysis of thermionic dispenser cathodes

Work function dependent neutralization of low-energy noble gas ions

Contact Info

Product

Resources

About