Regensburg 1998 – wissenschaftliches Programm

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DS: Dünne Schichten

DS 15: Organische Schichten

DS 15.3: Fachvortrag

Dienstag, 24. März 1998, 18:45–19:00, H 34

Electron Transmission Through Organized Organic Thin Films for Discrete Initial Electron Kinetic Energies — •T. Quast¹, B. Winter¹, I.V. Hertel¹, A. Haran², and R. Naaman² — ¹Max-Born-Institut f"ur Nichtlineare Optik und Kurzzeitspektroskopie, Postfach 1107, D-12474 Berlin, Germany — ²Weizmann Institute of Science, Dept. of Chem. Physics, Rehovot 76100, Israel

Synchrotron ratiation (SR) pulses are used to eject electrons from a gold substrate covered with highly organized organic thin films (OOTF)in order to investigate their transmission probability through the OOTF as a function of the electron initial kinetic energy. By variation of the SR photon energy within a few eV above the Au-4f binding energy levels we controlled the initial kinetic energy of the substrate electrons. The observed oscillations in the transmission probability for porphyrin-based films as a function of the kinetic energy is argued to be due to band structure effects of the well-ordered molecular adsorbate. We also present valence photoemission spectra (PES) of different type OOTF in order to confirm the films’ molecular structural order.