Dresden 2006 – scientific programme
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O: Oberflächenphysik
O 32: Adsorption IV
O 32.2: Talk
Thursday, March 30, 2006, 11:30–11:45, TRE Phys
Observation of the Dynamical Change in a Water Monolayer Adorbed on a ZnO Surface — •B. Meyer1, O. Dulub2, and U. Diebold2 — 1Lehrstuhl für Theoretische Chemie, Ruhr-Universität Bochum — 2Department of Physics, Tulane University, New Orleans, USA
A combined density functional theory (DFT) and scanning tunneling microscopy (STM) study shows a rich structure of water monolayers adsorbed on the ZnO(1010) surface at room temperature. Most of the water is in a lowest-energy configuration where every second molecule is dissociated. It co-exists with an energetically almost degenerate configuration, consisting of a fully molecular water monolayer. Parts of the layer continuously switch back and forth between these two states. DFT calculations reveal that water molecules repeatedly associate and dissociate in this sustained dynamical process.
[1] O. Dulub, B. Meyer, U. Diebold, Phys. Rev. Lett. 95, 136101 (2005)