Abstract
The Pb-induced \ensuremath{\surd}3 \ifmmode\times\else\texttimes\fi{} \ensuremath{\surd}3 mosaic phase of the Si(111) surface has been studied with Si 2p core-level and angle-resolved photoelectron spectroscopy. The results from these measurements provide evidence for a model with a 1:1 mixture of Pb and Si adatoms for the \ensuremath{\surd}3 \ifmmode\times\else\texttimes\fi{} \ensuremath{\surd}3 mosaic phase, which was proposed in a recent scanning tunneling microscopy study. We observe quite large surface core-level shifts which are interpreted as due to a charge transfer between the different adatom dangling-bond orbitals.
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