Dresden 2009 – wissenschaftliches Programm
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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 42.20: Poster
Mittwoch, 25. März 2009, 17:45–20:30, P2
Surface energy gradient produced by collision cascades: effects on pattern formation by ion beam sputtering — Reiner Kree1, •Taha Yasseri1, and Alexander K. Hartmann2 — 1Institute for Theoretical Physics, University of Göttingen, Friedrich-Hund Platz 1, D-37075 Göttingen, Germany. — 2Institute for Physics, University Oldenburg, Carl-von-Ossietzky Strasse 9-11, D-26111 Oldenburg, Germany
In the existing theories of pattern formation due to ion beam sputtering, the energy of collision cascades leads to sputtering of atoms. But the lateral displacements at the surface due to the excess energy are not taken into account. We provide a continuum and a Monte Carlo model, which include this effect. Both models are based on standard transport theory.
We discuss the importance of the additional lateral transport on ripple formation using results of MC simulations and numerical (finite element) solutions of the continuum model.