Physics – Condensed Matter – Materials Science
Scientific paper
2006-11-03
Physics
Condensed Matter
Materials Science
7 pages, 9 figure pages, 2 tables
Scientific paper
10.1103/PhysRevB.75.045401
We study the adsorption geometry of 3,4,9,10-perylene-tetracarboxylic-dianhydride (PTCDA) on Ag(111) and Cu(111) using X-ray standing waves. The element-specific analysis shows that the carbon core of the molecule adsorbs in a planar configuration, whereas the oxygen atoms experience a non-trivial and substrate dependent distortion. On copper (silver) the carbon rings resides 2.66 A (2.86 A) above the substrate. In contrast to the conformation on Ag(111), where the carboxylic oxygen atoms are bent towards the surface, we find that on Cu(111) all oxygen atoms are above the carbon plane at 2.73 A and 2.89 A, respectively.
Gerlach Alexander
Koch N.
Schreiber Frank
Sellner Stefan
Zegenhagen Jörg
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