Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 23: Scanning probe methods II
O 23.8: Vortrag
Montag, 14. März 2011, 19:00–19:15, WIL C307
Structure of the first water layer on Ru(0001) — •Sabine Maier1,2, Ingeborg Stass1, Peter J. Feibelman3, and Miquel Salmeron1 — 1Lawrence Berkeley National Laboratory, Berkeley, CA, USA — 2Friedrich-Alexander-Universität Erlangen, Erlangen — 3Sandia National Laboratories, Albuquerque, NM, USA
The structure and chemistry of water at surfaces and interfaces, though fundamental to many areas of science and technology, is largely unknown. Low temperature scanning tunneling microscopy data in combination with DFT calculations can, however, reveal the molecular structure of monolayer thick water films. By these means, we have found that compact clusters of flat-lying H2O molecules lie low on Ru(0001), and anchor the adsorbed layer to it. They alternate with clusters of molecules possessing a dangling H-bond, which bind weakly to the metal and, correspondingly, lie higher above the surface. Counter to conventional expectation, the high-lying molecular hexagons are rotated 30∘ relative to the principal axes of the metal crystal surface. This rotation leads to a bonding structure that significantly deviates from the conventional ice-like water model on hexagonal metals. Above 130K, we observed the formation of mixed water-hydroxyl structures following partial dissociation.