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Scanning Tunneling Microscopy and Atomic Force Microscopy

(Dr. G. Meyer, Dr. R. Koch, S. Zoephel, Dr. L. Bartels, E. Henze, K. Schaeffer, K. Braun)

Research Fields

UHV-STM at room and high temperature

Several STMs operating in UHV with atomic resolution have been developed to study the structure of single crystal metal surfaces and adsorbate systems as well as adsorbate induced reconstructions. [For example: Oxygen on Co(10-10), R. Koch et al.: Phys. Rev. Lett. 71, 1047 (1993)]. Recently one instrument was modified to allow operation up to 1000 K with the aim to study deconstruction and phase transitions.

Atom manipulation with low temperature STM

With an easy-to-operate versatile and low cost STM developed by Dr. G. Meyer, which can be operated between 15 and 300 K, we were able to prove controlled manipulation of single atoms and molecules as well as formation of nanostructures on atomic scale. Decisive progress was made recently as also native substrate atoms can be released from different high coordinated sites leading to the possibility to restructure the substrate itself in an atom by atom manner, whereby also deeper lying layers can be included. Together with manipulation of evaporated foreign substances this offers exciting possibilities for the build-up of man- made structures in the nanometer scale regime. The wide temperature range allows also the study of ordered weakly chemisorbed or physisorbed species like the rare gases.

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