Regensburg 2010 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 5: Electron and spin dynamics I

O 5.5: Vortrag

Montag, 22. März 2010, 12:15–12:30, H34

Ultrafast Electron Transfer Dynamics at Phosphorus-Metal Interfaces — •Florian Blobner, Stefan Neppl, and Peter Feulner — Physik-Department E20, TU-München, Germany

Ultrafast electron transfer reactions in heterogeneous systems are of paramount interest in both fundamental research and technology.

To obtain a better understanding of the underlying mechanisms of ultrafast charge transfer, we investigated the simplest model system, a reactive atom adsorbed on a surface. Using the core hole clock spectroscopy, we studied the influence of the electronic and structural properties of different adsorbate-substrate systems on the charge transfer dynamics. We investigated the following three systems: P/Ru(0001) with two different adsorbate superstructures and P/Cu(111).

Our analysis shows that the charge transfer of the excited phosphorus P2s electron to the conduction band of the Ru(0001) occurs on a timescale of a few femtoseconds down to several hundred attoseconds and is not affected by the symmetry of the adsorbate superstructure nor by the polarization of the electric field. In contrast to that, no evidence for an electron localization could be found for Phosphorus adsorbed on the Cu(111) surface. Our investigations also proved that both P/Ru(0001) systems are well suited for further analysis with the attosecond streaking technique which allows insight into the real time dynamics of the system.

Supported by the Excellence Cluster Munich-Centre for Advanced Photonics (project C1.5). We also thank the staff of BESSY for help during the experiments.