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O: Oberflächenphysik

O 36: Postersitzung (Elektronische Struktur, Grenzfl
äche fest-flüssig, Halbleiteroberfl
ächen und -grenzfl
ächen, Nanostrukturen, Oberfl
ächenreaktionen, Teilchen und Cluster, Struktur und Dynamik reiner Oberfl
ächen)

O 36.6: Poster

Montag, 7. März 2005, 15:00–18:00, Poster TU F

Controlled modification of the surface electronic structure by adsorbates: A high resolution ARPES study — •Johannes Ziroff, Felix Schmitt, Frank Forster, Azzedine Bendounan, and Friedrich Reinert — Experimentelle Physik II, Universität Würzburg, Germany

High energy resolution angular-resolved photoemission (ARPES) is a powerful tool for the direct investigation of electronic states at surfaces. By the example of (111) surfaces of Cu, Ag and Au we study the absorbate derived modification of Shockley surface states as well as the electronic states of the coverage.

We will show that physisorbed rare gases and chemisorbed alkali metals significantly modify the Shockley state binding energies and the band masses. In the case of gold there is an interesting change in the width of the spin-orbit splitting, related to the interaction between adsorbate and surface. Another particular example for an overlayer system are thin films of simple organic molecules on Ag (111). They usually inhibit the formation of Shockley surface states while their own electronic structure is modified by the surface interaction. We discuss the influence of the bonding character on the surface electronic structure.