Vicinally cut (100) and (111) surfaces were studied by using perturbed angular correlation spectroscopy and 111In probes at very low concentrations (0.0001ML). The occupation of step and terrace sites by probe atoms at the surfaces was deduced from the electric field gradient tensor, and was studied as a function of annealing temperature. The activation energies for microscopic diffusion steps were deduced from data on thermal conversion between the various 111In surface sites.

R.Fink, R.Wesche, T.Klas, G.Krausch, R.Platzer, J.Voigt, U.Wöhrmann, G.Schatz: Surface Science, 1990, 225[3], 331-40