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O: Fachverband Oberflächenphysik

O 59: Poster Session II (Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: arrays; Nanostructures at surfaces: Wires, tubes; Nanostructures at surfaces: Other; Plasmonics and nanooptics; Metal substrates: Epitaxy and growth; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsoprtion of organic / bio molecules; Metal substrates: Adsoprtion of inorganic molecules; Metal substrates: Adsoprtion of O and/or H; Metal substrates: Clean surfaces; Density functional theory and beyond for real materials)

O 59.97: Poster

Mittwoch, 24. März 2010, 17:45–20:30, Poster B1

Vibrational Spectroscopy of Adsorbate Molecules on Roughened Cu(111) — Heiner Maslosz, •Jan Pischel, Olaf Skibbe, and Annemarie Pucci — Kirchhoff-Institut für Physik, Im Neuenheimer Feld 227, D-69120 Heideberg

In order to close the so-called material gap between pristine low-index single crystal surfaces and rough surfaces we study slightly roughened copper surfaces. The roughness is introduced by evaporation of small amounts of copper to the cooled Cu(111) surface. Vibrational spectroscopy (HREELS and IRRAS) has shown in the past several interesting findings regarding the interaction of the roughened surface with adsorbed molecules (e.g. [1,2]). In this study, we present high-resolution electron energy loss spectroscopy (HREELS) measurements of the system O₂/Cu/Cu(111). We found already at oxygen exposures of 0.01 Langmuir spectral features that we attribute to atomically adsorbed oxygen. Since the sticking probability for oxygen on the smooth Cu(111) surface is quite low, this system provides a sensitive tool to quantify the introduced roughness.

[1] O. Skibbe, M. Binder, A. Otto, and A. Pucci. J. Chem. Phys., 128:194703, 2008.

[2] O. Skibbe, D. Vogel, M. Binder, A. Pucci, T. Kravchuk, L. Vattuone, V. Venugopal, A. Kokalj, and M. Rocca. J. Chem. Phys., 131:024701, 2009.