Growths of Au cluster and Au surface seen at atomic level by high resolution UHV electron microscopy are briefly summarized. Au clusters consisting of several atoms are directly seen during growth on a graphitized carbon and they show rapid structure change even at room temperature. On a stepped (110) surface, bilayer step growth is seen, which is closely related with the stability of the (110) surface having the 2 x 1 missing-row reconstructed structure.
