Study of Metal Surfaces by Scanning Tunneling Microscopy with Field Ion Microscope

The reconstruction of metal surfaces, Au (100)-(1x5) and Ni (110)-Au (7x4), have been studied with scanning tunneling microscopy (STM). The microscope is equipped with a field ion microscope which allows us to study the atomic structure of the tip and to correlate that geometry with the observed STM image. On the Au (100)-(1x5) surface, the measured corrugation depth of the (1x5) rows was found to be a function of the size of the atomic cluster on the first plane of the tungsten tip. On the Ni(110)-Au (7x4) surface, nearest neighbor Au atoms, separated by 2.9A, were resolved in the incommensurate structure. The growth mode of the Ni (110) will be presented.