Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 102: Epitaxy and growth: Metals and semiconductors II

O 102.6: Vortrag

Freitag, 18. März 2011, 12:30–12:45, WIL C307

Properties of Cu on Ru(10-10) revealed by AES, LEED and DEPES — •Michal Jurczyszyn, Jacek Brona, Ireneusz Morawski, and Marek Nowicki — Institute of Experimental Physics, University of Wroclaw, Pl. Maxa Borna 9, 50-204 Wroclaw, Poland

The growth of Cu and the crystalline structure of the Cu/Ru(10-10) system was investigated by means of Auger electron spectroscopy (AES), low energy electron diffraction (LEED) and directional elastic peak electron spectroscopy (DEPES). All experiments were performed by using an RFA analyzer. The Auger signal from the substrate and adsorbate recorded during continuous Cu deposition shows the formation of two monolayers of Cu at early stages of growth. Further evaporation leads to 3D growth of Cu. In DEPES the intensity of elastically backscattered electrons was measured as a function of the incidence angle of the primary electron beam at energies: 0.6keV, 0.9keV, 1.2keV, 1.5keV, and 1.8keV. Due to the forward scattering of primaries the enhancement of the recorded signal was obtained at incidence angles parallel to the close packed rows of atoms in clean and covered substrate. The distribution of intensity maxima reflects very well the twofold symmetry of the Ru(10-10) sample. The stereographic distributions obtained for 6ML of Cu reflect threefold symmetry pattern, characteristic for a (111) surface of the fcc structure. The latter was confirmed by LEED pattern observations. The experimental DEPES results were compared to theoretical distributions obtained by using the multiple scattering (MS) theory.