Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 41: Inorganic/Organic Interfaces
O 41.12: Poster
Dienstag, 17. März 2015, 18:15–21:00, Poster B
A light-microscope for samples under ultra-high vacuum conditions — •Christian Marquardt, Nils Rohbohm, Alexander Paulheim, and Moritz Sokolowski — Institut für Physikalische und Theoretische Chemie, Universität Bonn, Wegelerstraße 12, 53115 Bonn, Deutschland
Talking about microscopy in the field of surface science, most people would think about scanning probe microscopy (SPM) or low energy electron microscopy (LEEM). However, there is less than a handful of publications dealing with conventional light microscopy and samples under UHV-conditions. Such a microscope can be a direct tool to image surfaces prepared inside the UHV. Besides, it may be adapted to observe fluorescence from molecules adsorbed on these.
We modified a Nikon incident light microscope and combined it with our UHV-chamber. Due to the requirements of UHV, which are vacuum and bake-out stability, we place all optical components outside the vacuum and observe our sample through a window at the end of a glass tube. Using this technique, we are able to image our sample at a pressure of 1·10−10 mbar and temperatures down to 6 K directly after preparation.
First images of our Ag(100) crystal show a macroscopic corrugation of the surface with a typical structure size of 10-50 µm that is not expected from STM or LEED data. Supported by DFG.