Energy-resolved He atom scattering was used to investigate self-diffusion on Ag(110) at temperatures well below the bulk melting point. Information on the mobility of adsorbed Ag atoms between room temperature and 800K was obtained for the <1¯10> and <001> azimuthal directions by measuring the evolution of the quasi-elastic peak broadening with

parallel momentum transfer at various temperatures. The diffusion coefficients were estimated and a strong anisotropy was revealed by adsorbed atoms moving mainly along the <1¯10> surface rows. The main diffusion mechanism along this azimuth was pointed out and an estimation was made of the effective diffusion barrier. The results were compared with the predictions of molecular-dynamics calculations.

Surface Self-Diffusion at Intermediate Temperature - the Ag(110) Case. L.Pedemonte, R.Tatarek, G.Bracco: Physical Review B, 2002, 66[4], 045414 (5pp)