The mobility of Ag atoms adsorbed on Ag(110) was investigated along the <1¯10> and <001> azimuthal directions by means of energy-resolved He atom scattering. The results obtained at up to 775K exhibited a strong anisotropy. Above 600K, the adsorbed atoms diffused only along the <1¯10> azimuth. Information on the diffusion process was obtained by investigating the evolution of the quasi-elastic peak broadening with parallel momentum transfer and temperature. The main diffusion mechanism was pointed out, and the diffusion coefficient and effective diffusion barrier were measured.

Anisotropic Self-Diffusion on Ag(110). L.Pedemonte, R.Tatarek, M.Vladiskovic, G.Bracco: Surface Science, 2002, 507-510, 129-34