Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 69: Focussed Session: Towards a Quantitative Understanding of Complex Adsorption Structures: Surface Science goes Organic II
O 69.5: Vortrag
Donnerstag, 3. April 2014, 12:00–12:15, HSZ 01
Substrate induced intermolecular dispersion and observed hybridisation: Pentacene on Cu(110) — •Thomas Ules1, Eva Reinisch1, Markus Ostler2, Georg Koller1, Daniel Lüftner1, Peter Puschnig1, and Michael Ramsey1 — 1Institute of Physics, Karl-Franzens University Graz, 8010 Graz, Austria — 2University of Erlangen-Nürnberg, Erlangen, Germany
The 5A monolayer on Cu(110) has been studied by Angle Resolved UPS (ARUPS). The tomographic analysis of the ARUPS data cube into band (E vs. k) and momentum (kx vs. ky) maps reveal changes in both the substrate and molecule electronic structure upon the formation of the monolayer. In the region down to 1eV below the Fermi edge the momentum maps clearly show a 5A LUMO intensity distribution with a remarkably large dispersion of ~ 0.7eV in the direction of the long molecular axes. This contrasts to the calculated dispersion of a free standing 5A monolayer of only 20 meV and a truly significant enhancement of intermolecular dispersion is claimed. The strong periodic potential of the 5A overlayer leads to an apparent opening of a band gap in the Cu sp band which will be argued to be the result of the change of Cu sp states to molecular LUMO character.