Diffusion and aggregation of Agn-clusters (n = 2-9) on HOPG probed by fs-two-photon-photoemissionU. Busolt, E. Cottancin, L. Socaciu, H. Röhr, T. Leisner and L. WösteEur. Phys. J. D, 16 1-3 (2001) 297-300DOI: https://doi.org/10.1007/s100530170114