Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 49: Metal Substrates III: Structure, Epitaxy and Growth

O 49.3: Vortrag

Mittwoch, 3. April 2019, 11:00–11:15, H5

Structure analysis of ultrathin NaCl-layers on various metallic substrates — •Kira Kolpatzeck, Ebru Ekici, Vijaya Begum, Markus Gruner, Rossitza Pentcheva, and Rolf Möller — Faculty of Physics and Center of Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Lotharstr. 1, 47057 Duisburg, Germany

The electronic decoupling of single atoms, molecules or clusters from a metallic substrate gains in importance whenever radiative transitions shall be observed. Moreover, for various surface science methods, such as scanning tunneling microscopy, a non-vanishing surface conductivity is necessary. To combine those two requirements ultrathin insulating layers come into play. We have studied the growth of ultrathin NaCl films with various thicknesses on several copper and gold substrates by low-energy electron diffraction (LEED) and scanning tunneling microscopy (STM) at low temperatures (8 K and 80 K). As well-known from literature [1] the evaporation of NaCl onto a clean Cu(111) surface at room temperature leads to the growth of rectangular monolayer NaCl islands on top of a continuous NaCl film, which covers the surface partially. If the NaCl is deposited onto the heated copper surface, the formation of nanowires associated with dislocation lines is observed in our measurements. The study of evaporated NaCl on Au(110) also reveals two distinguishable superstructures, resulting from different arrangements of the interface atoms.

[1] R. Bennewitz, et al., Surf. Sci. 438, 289 (1999).