Construction and assembly of a scanning tunneling microscope
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In the scope of this master thesis, a home-made brass scanning tunneling microscope (STM) was machined, assembled and tested for its functionality. For this microscope, a new approach-technique was used which follows the design suggested by Pan. The difference to Pan's design is the use of piezoplates, instead of piezostacks. Hence, the approach is still based on the stick and slip motion, but it allows the microscope to be more compact. A new and simple electronic circuit, in order to control the approach, is presented and was put together. This circuit is based on mechanical relays, which provide a sufficient long time gap between the single moving steps, due to their mechanical functional principle. Subsequently the approach-technique and the scanning was successfully tested. Finally, first images of HOPG were taken under ambient conditions.