Scanning Tunneling Microscopy

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The publication entitled "Surface Studies by Scanning Tunneling Mi¿ Rl croscopy" by Binnig, Rohrer, Gerber and Weibel of the IBM Research Lab¿ oratory in Riischlikon in 1982 immediately raised considerable interest in the sur¿ face science community. It was demonstrated in Reference R1 that images from atomic structures of surfaces like individual steps could be obtained simply by scanning the surface with a sharp metal tip, which was kept in a constant distance of approximately 10 A from the sample surface. The distance control in scanning tunneling microscopy (STM) was realized by a feedback circuit, where the electri¿ cal tunneling current through the potential barrier between tip and sample is used for regulating the tip position with a piezoelectric xyz-system. A similar experi¿ mental approach has already been described by Young et al. for the determination l of the macroscopic roughness of a surface. A number of experimental difficulties had to be solved by the IBM group until t