Berlin 2008 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 43: Poster Session II - MA 141/144 (Surface Spectroscopy on Kondo Systems; Frontiers of Surface Sensitive Electron Microscopy; Methods: Scanning Probe Techniques+Electronic Structure Theory+Other; Time-Resolved Spectroscopy of Surface Dynamics with EUV and XUV Radiation; joined by SYNF posters)

O 43.7: Poster

Dienstag, 26. Februar 2008, 18:30–19:30, Poster F

Time and energy resolved mulitphoton-photoemission microscopy of organic materials — •Florian Lindla, Gerhard Lilienkamp, and Winfried Daum — Institut für Physik und Physikalische Technologien, TU Clausthal, Leibnizstraße 4, 38678 Clausthal, Germany

Polystyrene (PS) microspheres and PS films on oxidized Pt surfaces were investigated by a photoemission-electron-microscope (PEEM) with 400nm (3.1eV) fs laser excitation. For pump-probe measurements the illumination system was equipped with a delay-line consisting of thin film polarizer plates as beam splitter/combiner.

Energy resolved measurements on PS microspheres (300nm in diameter) resulted in an energy distribution showing one peak, which slightly shifts to higher electron energies at higher laser intensities.

For further investigation first time resolved measurements were performed on an oxidized Pt surface with partial PS coverage (around 100nm thickness), revealing the expected 2-photon-photoemission (2PPE) signal for the Pt substrate, while the signal of the PS coating is independent of probe delay, presumably due to an highly filled intermediate state proposed before.