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O: Fachverband Oberflächenphysik

O 36: Poster Session II (Metals; Nanostructures at surfaces; Surface or interface magnetism; Spin-Orbit Interaction at Surfaces; Electron and spin dynamics; Surface dynamics; Methods; Theory and computation of electronic structure)

O 36.54: Poster

Tuesday, March 15, 2011, 18:30–22:00, P4

Vibrational properties of copper on Cu(111) — Heiner Maslosz, •Olaf Skibbe, and Annemarie Pucci — Kirchhoff-Institut für Physik, Im Neuenheimer Feld 227, D-69120 Heidelberg

In the context of understanding the properties of rough and defect-rich surfaces it is useful to be able to characterize the surfaces roughness. By the use of electron energy loss spectroscopy (HREELS) we examined the vibrational features of small amounts of copper on Cu(111) evaporated at liquid nitrogen temperature. We found after annealing to ∼160 K a vibration with an energy of 44 meV polarized perpendicular to the surface. This is an extraordinary high energy compared to the bulk phonon band. Upon annealing to temperatures above 200 K the peak disappears. The attribution of the vibration features to morphological changes upon annealing is ongoing work.