Abstract
Nonradiative deexcitation processes in excited He atom-surface collisions have been investigated by monitoring ejected Auger electrons. At a clean Si(111) surface, He ∗ atoms (mainly in the 2 3S state) were deexcited by the resonance ionization followed by Auger neutralization (RIAN) path. Upon adsorption of lithium, they were forced to be directly Auger-deexcited (AD) at adsorbed-Li sites. The energy spectrum of electrons, thus ejected, reveals that the 2s resonance of adsorbed Li is partially occupied even in the limit of zero coverage. The conversion from RIAN to AD in the deexcitation of He ∗ was observed at exposed Si sites when the induced average work function change reached about −1.3 eV. The local work function at sites where He ∗ atoms approach and the local charge state of adsorbates are discussed.
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