Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 19: Metal substrates: Adsorption of O / H and inorganic molecules II
O 19.7: Vortrag
Montag, 14. März 2011, 18:45–19:00, WIL A317
CuN structures on Cu(110) — •Mariella Denk, Richard Denk, Michael Hohage, Lidong Sun, and Peter Zeppenfeld — Institut für Experimentalphysik, Johannes Kepler Universität Linz, A-4040 Linz, Austria
Chemisorption of atomic nitrogen on Cu(110) leads, at a saturation coverage of 2/3, to the formation of a well ordered Cu(110)-(2x3)N reconstruction upon annealing at 650 K [1], [2].
An in-depth study concerning the formation of the nitrogen induced reconstruction has been performed to address open questions regarding the exact structure of the surface at the atomic scale. In case of an annealing temperature below 550 K, a precursory Cu-N phase which consists of elongated molecule-like structures, termed “CuN compounds”, has been found on the surface by Scanning Tunneling Microscopy (STM). The CuN compounds are characterised by their high mobility on the surface and have been found to be stable up to at least 550 K. The compounds are expected to play a crucial role in the formation of the final (2x3)N phase, as the Cu coverage of the surface layer is increased to 4/3 compared to the pristine Cu(110) surface. A model structure for the CuN compounds has been derived on the basis of the STM images. The CuN compounds may consist of Cu4N subunits, which appear as bright dots in the STM images.
[1] D. Heskett, A. Baddorf and E. W. Plummer, Surf. Sci.,
195, p. 94 (1988)
[2] A. P. Baddorf and D. M. Zehner, Surf. Sci., 238, p. 255
(1990)