https://doi.org/10.1007/s100510050711
Electron transmission through organized organic thin films studied by discrete initial electron kinetic energies
1
Department of Chemical Physics,
Weizmann Institute of Science,
76100 Rehovot, Israel
2
Department of Organic Chemistry,
Weizmann Institute of Science,
76100 Rehovot, Israel
3
Max-Born-Institut für Nichtlineare
Optik und Kurzzeitspektroskopie,
Postfach 1107, 12474 Berlin, Germany
Received:
24
July
1998
Published online: 15 April 1999
Synchrotron radiation (SR) pulses are used to eject electrons from a gold substrate covered with 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 effects of band structure above the vacuum level in the well-ordered molecular adsorbate. We also present valence photoemission spectra (PES) of different type OOTF and demonstrate how their coverage of the substrate affects the PES.
PACS: 79.60.Dp – Adsorbed layers and thin films / 73.20.At – Surface states, band structure, electron density of states / 73.61.Ph – Polymers; organic compounds
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 1999
