Regensburg 2004 – wissenschaftliches Programm
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O: Oberflächenphysik
O 11: Elektronische Struktur (Experiment und Theorie) I
O 11.10: Vortrag
Montag, 8. März 2004, 18:00–18:15, H44
Interface states of rare gas covered noble metal surfaces — •Frank Forster1, Dunja Popovic1, Stefan Schmidt1, Brigitte Eltner1, Friedrich Reinert1, Stefan Hüfner1, Valeri Grigoryan2, and Michael Springborg2 — 1FR 7.2 Experimentalphysik, Universität des Saarlandes, 66041 Saarbrücken — 2FR 8.13 Physikalische Chemie, Universität des Saarlandes, 66041 Saarbrücken
On the example of surfaces in (111)-direction of Cu, Ag and Au we demonstrate that even one monolayer of physisorbed adsorbates like Ar, Kr and Xe essentially influences the electronic structure of these systems. Thus, angular resolved photoemission spectroscopy (ARPES) (Δ E=3.5 meV, Δ Θ=0.3∘) is not only able to measure subtle and characteristic shifts of the binding energies of the L-gap Shockley states of the substrates towards or even above the Fermi-level, but also — in the case of Au(111) — an increase of the spin-orbit-splitting by about 30%. Furthermore, we studied the influence of the surface reconstruction in the case of the commensurate growth of one Xe layer on Cu(111) on the bulk and surface states. Our results have been supported by slab-layer-calculations that also result in a detailed understanding of the electronic processes in the adsorbate-substrate-interface.