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O: Fachverband Oberflächenphysik

O 18: Focus Session: Structure, Chemistry, and Ion Solvation at Solid-Liquid Interfaces I

O 18.1: Topical Talk

Dienstag, 17. März 2015, 10:30–11:00, HE 101

Water adsorption on Ru(0001): A molecular perspective — •Sabine Maier — Department of Physics, FAU Erlangen-Nürnberg, Germany

Water and its dissociation products play an important role in many areas of fundamental science and technological applications. The water molecules at the interface with metal surfaces are arranged differently than those in the bulk liquid or ice due to their strong bonding to the surface. Here, molecular level studies are presented using low temperature scanning tunneling microscopy, that offer new insights into the formation of a wetting layer and the water dissociation process on Ru(0001). We found a bonding motif of the first water layer consisting of rotated hexagonal molecular domains connected by pentagons and heptagons, which deviates significantly from the conventional ice-like water model.[1] Above 150K, we observed the formation of mixed water-hydroxyl structures following partial dissociation. The reaction path for the dissociation process and its energetics will be discussed.[2]

[1] S. Maier et al. Phys. Rev. B 85, 155434 (2012)

[2] S. Maier et al. Phys. Rev. Lett. 112, 126101 (2014)