A clue for unusual metallic aggregates with monomers in the nanometer scale

Laser evaporation of metals followed by condensation within an inert gas has yielded monomers in the nanometer range aggregated in a complex cobweb like pattern, quite unusual when compared with the results obtained via ohmic heating. The latter correspond to isolated fractal structures well reproduced by diffusion limited aggregation models. A multiple aggregation model appears to provide a clue to the understanding of the observations reported here.