Berlin 2005 – wissenschaftliches Programm

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O: Oberflächenphysik

O 41: Elektronische Struktur III

O 41.8: Vortrag

Dienstag, 8. März 2005, 12:30–12:45, TU EB107

PES and LEED-IV measurements of Cu(100)c(2×2)N in comparison with theoretical studies — •Ch. Kant¹, Th. Michalke¹, Ch. Bumiller¹, J. Braun², A. Postnikov³, and R. Matzdorf¹ — ¹Institut für Physik, Universität Kassel — ²Universität Münster — ³Universität Osnabrück

The atomic structure of the self organized nanopatterned adsorbate system Cu(100)c(2×2)N is still under discussion and the electronic band-structure was not measured so far. Although it is known since 30 years, that nitrogen adsorbs at the fourfold hollow site, the positions of the outermost copper-atoms, which may undergo a strong reconstruction due to the incommensurate adsorption of nitrogen, is not clarified completely. We present the first angle resolved photoemission spectra of this system. The measurements are compared with detailed theoretical calculations based on the one-step model of photoemission. These calculated spectra are very sensitive to the positions of N- and Cu-atoms. The results from the calculations may help to understand the atomic structure of the adsorbate system. In addition we use LEED-IV analysis to evaluate the models of the surface structure.