The motion of Au crystallites on the (100) surface of a single crystal was monitored by using electron microscopic techniques. The crystallites were found to migrate as separate entities. The diffusion coefficient at 100C was equal to 6 x 10-14cm2/s.

Detection of the Brownian Migration of Au Crystalline Adherent to a Clean KCl (100) Surface by a High Step Size Shadow Method. J.J.Metois, M.Gauch, A.Masson: Comptes Rendus de l’Academie des Sciences – B, 1971, 272[17], 958-61