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SYSX: Symposium Soft X-ray induced ultafast processes on the atomic scale

SYSX 1: Soft X-ray induced ultrafast processes I

SYSX 1.1: Invited Talk

Thursday, March 22, 2007, 14:00–14:30, 6G

Unraveling ultra fast dynamic processes at selected atomic sites — •Alexander Foehlisch — Department Physik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg

Ultra fast electron and nuclear dynamics play a decisive role in processes like photo- and electrochemistry as well as in molecular electronics and single electron devices. If we are interested in a dynamic process within a complex systems it is of equal importance to address the temporal evolution of the wave packet and the question at which atomic center the dynamic has started. These requirements can be matched with the element specific information from soft x-ray spectroscopy [1,2]. The novel X-ray source of the Free-Electron-Laser provides us with an unprecedented peak brilliance of femtosecond X-ray pulses. With these femtosecond radiation pulses at the Free Electron Laser in Hamburg (FLASH) we have investigated ultra fast dynamic processes in a pump-probe set-up in combination with an optical short-pulse laser.

[1] A. Föhlisch, P. Feulner, F. Hennies, A. Fink, D. Menzel, D. Sanchez-Portal, P. M. Echenique, W. Wurth, Direct observation of electron dynamics in the attosecond domain. Nature 436, 373 (2005).

[2] S. Vijayalakshmi, A. Föhlisch , F. Hennies, A. Pietzsch, M. Nagasono, W. Wurth. Surface projected electronic band structure and Adsorbate charge transfer dynamics: Ar adsorbed on Cu(111) and Cu(100). Chem. Phys. Lett. 427, 91-95 (2006).