The migration of K on (112) W surfaces, which were covered with pre-adsorbed Ni, was studied via the spectral analysis of field emission flicker noise. It was found that the activation energy for surface diffusion depended upon the Ni coverage. That is, it first decreased from a value of about 0.5eV to a value of about 0.33eV and then increased to almost 0.55eV, with increasing Ni coverage. The reduction was attributed to a smoothing effect which was caused by the presence of the Ni atoms on the (112) plane.

R.Blaszczyszyn, C.Kleint: Surface Science, 1991, 253[1-3], 129-36