Substrate dependent bonding distances of PTCDA - A comparative XSW study on Cu(111) and Ag(111)

Abstract

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.

7 pages, 9 figure pages, 2 tables

References in corpus (2)

• Adsorption-Induced Distortion of F_{16}CuPc on Cu(111) and Ag(111): An X-ray Standing Wave Study
• Late growth stages and post-growth diffusion in organic epitaxy: PTCDA on Ag(111)

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