Dresden 2003 – wissenschaftliches Programm
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O: Oberflächenphysik
O 6: Nanostrukturen I
O 6.1: Vortrag
Montag, 24. März 2003, 11:15–11:30, M\"UL/ELCH
Energy shift of surface phonon-resonances in a variable nanograting: HREELS studies of the striped Cu(110)(2×1)O surface — •Olaf Skibbe1,2, Karsten Berge1, Gero Meister1, and Albrecht Goldmann1 — 1Fachbereich Physik der Universität Kassel — 2Kirchhoff-Institut für Physik, Universität Heidelberg
Dissociative room-temperature chemisorption of oxygen on Cu(110) and subsequent annealing selforganizes the formation of a quasi-one-dimensional nanograting consisting of alternating stripes of reconstructed Cu(110)(2×1)O and unreconstructed Cu(110). Depending on the global oxygen coverage (between zero and 0.5), the ratio of Cu-domain width to oxide-domain width can be varied from about 4 to 0.2 while the periodicity of the grating changes between 6 nm and about 14 nm [1]. Using high-resolution electron-energy-loss spectroscopy we demonstrate that surface phonons characteristic for the oxide and copper domains can be distinguished experimentally. We report and discuss their energy shifts as a function of domain widths. The phonon frequencies respond to the pattern formation even at the largest distances between neighboring oxygen-covered stripes.
[1] K. Kern et al., Phys. Rev. Lett. 67, 855 (1991)