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We study the adsorption geometry of3,4,9,10-perylene-tetracarboxylic-dianhydride (PTCDA) on Ag(111) and Cu(111)using X-ray standing waves. The element-specific analysis shows that the carboncore of the molecule adsorbs in a planar configuration, whereas the oxygenatoms experience a non-trivial and substrate dependent distortion. On copper(silver) the carbon rings resides 2.66 A (2.86 A) above the substrate. Incontrast to the conformation on Ag(111), where the carboxylic oxygen atoms arebent towards the surface, we find that on Cu(111) all oxygen atoms are abovethe carbon plane at 2.73 A and 2.89 A, respectively.Comment: 7 pages, 9 figure pages, 2 table

Substrate-dependent bonding distances of PTCDA: A comparative x-ray standing-wave study on Cu(111) and Ag(111)