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O: Fachverband Oberflächenphysik

O 42: Poster Session II (Nanostructures at surfaces: arrays; Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: Other; Nanostructures at surfaces: Wires, tubes; Metal substrates: Adsorption of O and/or H; Metal substrates: Clean surfaces; Metal substrates: Adsorption of organic/bio moledules; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsorption of inorganic molecules; Metal substrates: Epitaxy and growth; Heterogeneous catalysis; Surface chemical reactions; Ab-initio approaches to excitations in condensed matter; Organic, polymeric, biomolecular films– also with adsorbates; Particles and clusters)

O 42.42: Poster

Mittwoch, 25. März 2009, 17:45–20:30, P2

Spatial modulation of molecular adsorption energies due indirect interactions — •Stephan Blankenburg and Wolf Gero Schmidt — Theoretische Physik, Universität Paderborn, Germany

The autonomous ordering and assembly of atoms and molecules on atomically well-defined surfaces appears as a very promising alternative route to even smaller functional systems with nanometre dimensions. However, the mechanisms controlling the self-ordering phenomena need to thoroughly understood in order to use them for nanofabrication processes. In this context we investigate computationally the origin of long-range order observed experimentally for the adsorption of (i) (s)-glutamic acid on Ag(110) [1] and (ii) phenylglycine and adenine on Cu(110) [2,3]. In both cases we find long-wave oscillations of the substrate charge density to be decisive for the adsorption configuration. In case of glutamic acid adsorbed on Ag(110), long-rangestrain field are very important as well, while they are nearly negligible for phenylglycine and adenine adsorbed on Cu(110).
[1] T. E. Jones, M. Rocca and L. Vattuone, Langmuir 21, 9468 (2005)
[2] Q. Chen and N.V. Richardson, Nat. Mater. 2, 324 (2003).
[3] S. Blankenburg and W. G. Schmidt, PRL 99, 196107 (2007).