Berlin 2012 – scientific programme

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O: Fachverband Oberflächenphysik

O 35: Poster Session II (Polymeric biomolecular films; Nanostructures; Electronic structure; Spin-orbit interaction; Phase transitions; Surface chemical reactions; Heterogeneous catalysis; Particles and clusters; Surface magnetism; Electron and spin dynamics; Surface dynamics; Methods; Electronic structure theory; Functional molecules)

O 35.121: Poster

Tuesday, March 27, 2012, 18:15–21:45, Poster B

A scanning tunneling microscope control system based on a field programmable gate array — •Peter-Jan Peters, Thomas Jürgens, and Richard Berndt — Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany

A new scanning tunneling microscope control device based on a field programmable gate array (FGPA) and a real time computer is presented. Industry standard PXI data acquisition cards and custom design digital to analog converter circuits are used. The custom converters show a noise density of 950 nV/√Hz in the relevant frequency range. New modes of measurement can be implemented in a flexible manner owing to the programmability of the FPGA. A layered software design is used to hide the detail of the FPGA programming from most users. Test measurements on Au(111) surfaces performed at ambient temperatures resolving the surface reconstruction show that state of the art performance is achieved.