  Using the embedded-atom method, the structure of small copper clusters on
Au(111) electrodes has been investigated both by static and dynamic
calculations. By varying the size of roughly circular clusters, the edge energy
per atom is obtained; it agrees quite well with estimates based on experimental
results. Small three-dimensional clusters tend to have the shape of a pyramid,
whose sides are oriented in the directions of small surface energy. The
presence of a cluster is found to distort the underlying lattice of adsorbed
copper atoms.
