Scanning tunneling microscopy (Reprinted from IBM Journal of Research and development, vol 30, 1986)

Presented here is an overview of the present status and future prospects of scanning tunneling microscopy. Topics covered include the physical basis o f the scanning tunneling microscope, its instrumentation aspects, and its u se for structural and spectroscopic imaging-on a scale which extends to ato mic dimensions. Associated experimental and theoretical studies are reviewe d, including several which suggest potential applicability of this new type of microscope to a relatively broad range of biological, chemical, and tec hnological areas.