"Attosecond electron dynamics in solids."

After the full characterization of the tools for attosecond spectroscopy by the attosecond streaking technique [1], 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 [2,3]. 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. We measured different time delays in the emission of the aforemention two types of electrons in different solids. Recent experiments towards an absolute measurement of the travel time of electron inside solids and through layered systems are discussed.On the other hand, experiments with molecules in the gas phase and on surfaces are carried out. UV pump / XUV probe experiments to investigate ultrafast electron dynamics in these molecules are introduced. [1] R. Kienberger et al., Nature 427, 817 (2004)[2] A. Cavalieri et al., Nature 449, 1029 (2007)[3] S. Neppl et al., PRL 109 (8), 087401 (2012)