Dresden 2006 – wissenschaftliches Programm

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O: Oberflächenphysik

O 29: Poster session II (Nanostructures, Magnetism, Particles and clusters, Scanning probe techniques, Time-resolved spectroscopy, Structure and dynamics, Semiconductor surfaces and interfaces, Oxides and insulators, Solid-liquid interfaces)

O 29.45: Poster

Mittwoch, 29. März 2006, 14:30–17:30, P2

Improved design for a variable temperature scanning tunneling microscope — •Jan Wienhausen, Germar Hoffmann, and Roland Wiesendanger — Institut für Angewandte Physik und Zentrum fürMikrostrukturforschung, Universität Hamburg, 20355 Hamburg,Germany

Variable temperature scanning tunneling microscopy (VT-STM) is a versatile tool to study locally the growth of molecular systems on a carrier substrate. A recently installed VT-STM operated in ultra-high vacuum demonstrated high vertical and lateral stability down to 30 K sufficient for single molecule spectroscopy. To increase the available temperature range further we studied numerically the heat flow in the STM design. Whereas the rigid STM design itself is kept unmodified the design is optimized in terms of the heat balance. Heat transfer from a liquid helium flow cryostat is increased and heat losses to the environment are reduced. Here we will discuss the numerical results along with the detailed instrumental realization in comparison with its precursor. First applications to insitu prepared molecular films will be presented.