Attosecond photoelectron spectroscopy at surfaces

We apply the attosecond streaking technique for time-resolved studies of electron emission from solids. Employing isolated attosecond XUV pulses in combination with sub-4 femtosecond NIR pulses, the relative timing of photoemission from different electronic states can be determined with a temporal resolution approaching 10 attoseconds. In the quest of measuring the absolute time between photoexcitation an emission of an electron from a solid, we investigate clean metal surfaces in comparison to xenon covered surfaces. In addition, we study the relative emission time of 5d valence electrons and 4d core electrons of atomic xenon in comparison to condensed xenon.