Charge exchange in low-energy He+ ion scattering from solid surfaces

R.J.A. Oetelaar, van den, C.F.J. Flipse

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    We present a model for neutralization of He+ based on resonant charge transfer from a surface valence band to the He 2s level, followed by Auger deexcitation or autoionization, thus creating a He atom in the ground state. If a He+ ion approaches a surface, it is energetically favorable for the He-surface system to screen the 1s core hole by putting an electron in the 2s level. By taking into account this Coulomb interaction Q we are able to explain the trend in the neutralization behavior of 1–5-keV He+ ions scattered from clean metal surfaces. It is shown that the neutralization probability of He+ is mainly determined by the work function and the surface local density of states.
    Original languageEnglish
    Pages (from-to)10807-10807
    Number of pages4
    JournalPhysical Review B: Condensed Matter
    Issue number15
    Publication statusPublished - 1995


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