Berlin 2008 – scientific programme

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O: Fachverband Oberflächenphysik

O 58: Symposium: Beyond Optical Wavelengths: Time-Resolved Spectroscopy of Surface Dynamics with EUV and XUV Radiation I (Invited Speakers: Reinhard Kienberger, Martin Aeschlimann)

O 58.2: Invited Talk (no funding)

Thursday, February 28, 2008, 10:00–10:30, HE 101

Time- and angle-resolved photoemission spectroscopy using a femtosecond high-harmonic light-source — •Martin Aeschlimann — Department of Physics, TU Kaiserslautern, 67663 Kaiserslautern

To date, femtosecond high-harmonic (HHG) light sources have been used successfully in a number of IR-pump XUV-probe photoemission experiments to study the ultrafast dynamics of surface processes. Examples include electron relaxation in materials, surface adsorbate dynamics, photoacoustic dynamics, and molecular dissociation. All these IR-XUV geometries are accompanied by incident laser fields of > 10¹¹ W/cm² leading to additional interesting laser-assisted strong-field dynamic processes on solid surfaces. For instance, just recently the laser assisted photoelectric effect (LAPE) could be demonstrated for IR-XUV excitation of a Pt(111) surface [1] as well as laser assisted auger decay (LAAD). Recent experimental results in this field will be presented. Furthermore, time resolved IR-XUV photoemission can be extended to the momentum space by the use of state-of-the-art 2D photoelectron spectrometers [2]. First ARPES spectra recorded with HHG light pulses will be presented, showing the potential of this technique for future investigations of surface dynamics.
L. Miaja-Avila et al., Phys. Rev. Lett. 97, 113604 (2006)
S. Mathias et al., Rev. Sci. Instr. 78, 083105 (2007)