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MM: Fachverband Metall- und Materialphysik

MM 34: SYM Hydrogen in Materials: New Developments II

MM 34.1: Invited Talk

Thursday, February 28, 2008, 11:40–12:10, H 1058

The Interaction of Hydrogen with Metal Surfaces: Molecular Precursors, Chemisorbed Atoms and Subsurface States — •Klaus Christmann — Institut für Chemie und Biochemie der FU Berlin, 14195 Berlin

In this contribution, the scenario of hydrogen interaction with (single-crystalline) metal surfaces will be surveyed including physisorbed and chemisorbed molecular hydrogen, dissociative (atomic) hydrogen adsorption, and subsurface H state population, whereby both energetic and kinetic phenomena will be considered. Special attention is devoted to H-induced structural changes of the surface region of the exposed crystal (relaxation and reconstruction), on subsurface state population and especially on molecularly chemisorbed hydrogen. Relatively strongly bound adsorbed hydrogen molecules may play an important role as a precursor during H uptake and storage processes, and recent results obtained for H and H2 interacting with the (210) surfaces of the fcc metals Ni, Pd and Rh will be presented.