Abstract
We have studied the evolution of the Pt(111) Shockley-type surface state, which can be described as a surface resonance upon deposition of Ag monolayers. We have combined angle-resolved photoemission and scanning-tunneling-spectroscopy measurements with electronic-structure and photoemission calculations for true semi-infinite systems to guarantee a complete description of all surface-sensitive spectral features. An unusual energy shift and a considerable Rashba-type spin-orbit splitting of the surface resonance were observed and are discussed in terms of modifications in the electronic structure and relationship between the semi-infinite bulk and the surface potential via multiple electron scattering. The maximum magnitude of the splitting in momentum space amounts to $0.051\ifmmode\pm\else\textpm\fi{}0.007$ \AA{}${}^{\ensuremath{-}1}$ and appears as one of the highest values so far observed in the $\mathrm{\ensuremath{\Gamma}\ifmmode \bar{}\else \={}\fi{}}$-type surface-state-resonance bands.
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