Berlin 2008 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 63: Symposium: Frontiers of Surface Sensitive Electron Microscopy II (Invited Speakers: Jürgen Kirschner, Liviu Chelaru, Michael Bauer, Claus Schneider)
O 63.5: Vortrag
Donnerstag, 28. Februar 2008, 11:15–11:30, MA 043
Energy and time resolved photoelectron emission microscopy (PEEM) measurements of nanostructured surfaces — •Christian Schneider1, Martin Rohmer1, Daniela Bayer1, Michael Bauer2, and Martin Aeschlimann1 — 1Department of Physics, TU Kaiserslautern, Erwin Schrödinger Str. 46, 67663 Kaiserslautern — 2Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24908 Kiel
The combination of two photon photoemission and photoelectron emission microscopy is a versatile tool to study electron dynamics at nano-structured surfaces with high spatial and temporal resolution. The fast parallel image acquisition allows to obtain "lifetime maps" with a temporal accuracy of a few femtoseconds, however, in general without any spectral selectivity. In the past year, our setup was upgraded with an interchangeable delayline-detector allowing simultaneously energy resolved measurements. The performance and the high energy resolution provided with this detector will be demonstrated at the example of the Shockley surface state of Cu (111). The simultaneous access to space, time and energy by the combination of PEEM, time-resolved 2PPE and delayline-detector provides thus the potential to study coupling effects between nanoparticles as well as plasmon decay in realtime. We will show first results of specially shaped silver nanoparticles measured with high spatial, temporal and spectral resolution, including lifetime-maps created for different electron energies.