Berlin 2008 – wissenschaftliches Programm

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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 58.1: Hauptvortrag (ohne Erstattung)

Donnerstag, 28. Februar 2008, 09:30–10:00, HE 101

First steps of attosecond spectroscopy in condensed matter — •Reinhard Kienberger — Max-Planck-Institut für Quantenoptik, Hans Kopfermann Str. 1, 85748 Garching, Deutschland

The generation of ever shorter pulses is a key to exploring the dynamic behavior of matter on ever shorter time scales. Electronic dynamics inside atoms often evolve on an attosecond (1 as = 10-18 s) timescale and require sub-femtosecond pulses for capturing them. Atoms exposed to a few oscillation cycles of intense visible or near-infrared light are able to emit a single electron and XUV photon wavepacket of sub-femtosecond duration. Precise control of these sub-femtosecond wavepackets have been achieved by full control of the electromagnetic field in few-cycle light pulses. These XUV pulses together with the few-cycle (few-femtosecond) laser pulses used for their generation have opened the way to the development of a technique for attosecond sampling of electrons ejected from atoms or molecules. First experiments have been carried out to measure sub-femtosecond behavior of matter like the dynamics of the photoionization process on solids. Not only that attosecond metrology now enables clocking on surface dynamics, but also the individual behaviour of electrons of different type (core electrons vs. conduction band electrons) can be resolved. Here, we measured a time delay of about 100 as on the emission of the aforemention two types of electrons.