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Time-Resolved Photoelectron Spectroscopy at Metal Surfaces
Ulrich Hoefer (Marburg University)
Seminar Room 3, 15.00 h
Electron transfer processes at surfaces and interfaces play a crucial role in diverse fields of materials sciences, e.g. in chemical catalysis or in electronic device physics. Time-resolved two-photon photoemission (2PPE), a method that combines femtosecond pump-probe techniques with photoelectron spectroscopy, can provide detailed information about the ultrafast dynamics of such processes. As an example, I will discuss the rich electron dynamics of a simple model system, the hydrogen-like image-potential states at metal surfaces.
Emphasis will be on coherent phenomena and quantum interference effects: wavepacket excitation, coherently controlled electrical currents and resonance trapping.
