Berlin 2005 – wissenschaftliches Programm
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O: Oberflächenphysik
O 25: Zeitaufgelöste Spektroskopie II
O 25.7: Vortrag
Samstag, 5. März 2005, 16:30–16:45, TU EB420
How much does the surface projected band structure influence ultra fast charge transfer at a surface?
The case of Ar adsorbed on Cu(111) and Cu(100) — •Alexander Föhlisch, Sethuraman Vijayalakshmi, Franz Hennies, Annette Pietzsch, Mitsuru Nagasono, and Wilfried Wurth — Universität Hamburg, Institut für Experimentalphysik, Luruper Chaussee 149, D-22761 Hamburg
Surfaces and interfaces determine many properties of matter. Next to the geometric structure of the surface the surface projected bulk band structure and surface states and resonances play an important role. Even the difference of the surface electronic structure of different crystal faces has consequences for the charge transfer dynamics at these surfaces. Charge transfer at the Cu(100) and Cu(111) surfaces has drawn considerable attention from experiment and theory [1,2,3], due to the difference of their surface projected band gap. Using core hole clock spectroscopy we have shown in previous work that ultra fast charge transfer varies significantly for different metal surfaces [4].
In this contribution we show that charge transfer of the 4s electron of core-excited 2p3/2−14s1 Ar adsorbed on the Cu(100) surface is a factor of two faster than on the Cu(111) surface.
This work was supported by the DFG SPP 1093.
[1] M. Bauer et al., Phys. Rev. B 60, 5016 (1999)
[2] A.G. Borisov et al., Phys. Rev. Lett. 86, 488 (2001)
[3] J. P. Gauyacq and A. G. Borisov, Phys. Rev. B 69, 235408 (2004)
[4] A. Föhlisch et al., Chem. Phys. 289, 107 (2003)