Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 31: Poster Session - Metal substrates: Structure, Epitaxy and Growth

O 31.5: Poster

Montag, 16. März 2020, 18:15–20:00, P1C

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

To observe radiative transitions in molecules, single atoms or clusters it is necessary to decouple those from any metallic substrate. On the other hand, for surface science methods, such as scanning tunneling microscopy, a non-vanishing surface conductivity has to be ensured. Ultrathin insulating layers are the key to circumvent those two requirements. Therefore, we have studied the growth of ultrathin sodium chloride (NaCl) films with various layer thickness on different metallic substrates by low-energy electron diffraction (LEED) and scanning tunneling microscopy (STM) at low temperatures (8K and 80K). We could show that the evaporation of NaCl on Au(110) leads to the growth of NaCl islands of different height. The first two layers are showing a (1x4) superstructure rectangular to the missing-row reconstruction of the Au(110) surface. Incomplete growth structures like holes in the islands as well as the third sodium chloride layer show the well-known rectangular edge geometry. With the aid of DFT-calculations a first structure model could be found to explain the observed superstructure.