Dresden 2011 – wissenschaftliches Programm

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SYAP: Intersectional Symposium Attosecond Physics: Atoms, Molecules and Condensed Matter

SYAP 1: Attosecond Physics: Atoms, Molecules, Condensed Matter

SYAP 1.4: Hauptvortrag

Montag, 14. März 2011, 12:00–12:30, HSZ 01

Attosecond spectroscopy on solid surfaces — •Reinhard Kienberger — Fakultät für Physik, TUM, James Franck Str., 85748 Garching

The generation of ever shorter pulses is a key to exploring the dynamic behavior of matter on ever shorter time scales. Attosecond XUV pulses together with the few-cycle (few-femtosecond) IR 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 or solids. 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 [1]. After the full characterization of these tools, first experiments have been carried out to measure sub-femtosecond behavior of matter. Recently, the dynamics of the photoionization process on solids has been studied [2]. 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. For absolute determination of the emission process, the *travel* time of electrons through defined numbers of adlayers is investigated.

[1]*R. Kienberger et al., Nature 2004, 427, 817. [2]*A. Cavalieri et al., Nature 2007, 449, 1029.