Abstract
Perylene-3,4,9,10-tetracarboxylic-dianhydride (PTCDA) was commensurably grown on Ag(110) by organic molecular-beam deposition (OMBD) under ultra-high vacuum conditions at 5 × 10 −8 Pa. In the monolayer regime, an epitaxial superstructure exists in a single domain orientation, as investigated with low energy electron diffraction (LEED) and scanning tunneling microscopy (STM). Molecular modelling calculations result in the same commensurate structure and provide, in addition, the absolute position of the adsorbate relative to the silver surface. As a result, the flat-lying PTCDA molecules are orientated in the (001) direction of the Ag(110) unit cell, leaving small holes with three uncovered silver atoms between the molecules.
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