Berlin 2008 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 52: Time-Resolved Spectroscopy III

O 52.10: Vortrag

Mittwoch, 27. Februar 2008, 17:30–17:45, MA 042

Towards time resolved core level photoelectron spectroscopy with femtosecond X-ray free-electron lasers — •Annette Pietzsch, Alexander Föhlisch, Martin Beye, Martin Deppe, Franz Hennies, Mitsuru Nagasono, and Wilfried Wurth — Institut für Experimentalphysik, Universität Hamburg, Luruper Chaussee 149, D-22761 Hamburg

We have conducted an investigation of space-charge induced peak shift and peak broadening in W 4f core-level photoemission from a W(110) single crystal surface using femtosecond X-ray pulses from the Free-Electron Laser at Hamburg (FLASH). We have established experimentally and through theoretical modelling what should be generally applicable conditions for photoelectron spectroscopy on solids and surfaces using femtosecond X-ray pulses from free-electron laser facilities. As a next step, we have studied within this working range time-resolved core-level photoelectron spectroscopy on a surface combining a femtosecond optical laser synchronized to the femtosecond X-ray pulses. Here, side bands to the W 4f core level lines give evidence of the cross-correlation between the femtosecond x-ray and optical pulses needed for future studies of femtosecond time-resolved core-level photoelectron spectroscopy on solids and surfaces. This work is supported in the framework of the BMBF Forschungsschwerpunkt 301 FLASH: Matter in the light of ultrashort and extremely intense x-ray pulses.

A. Pietzsch et al., submitted