Ar and CO_2 physisorption on a very well crystallized sample of fullerene C_60 was studied by means of Monte Carlo computer simulations. Ar and CO_2 experimental isotherms were determined on high-purity C_60 to fit the potential parameters. Analysis of the structure of the adsorbed film indicated that both gases are adsorbed in the voids of the C_60 structure in a solid state with densities slightly larger than the bulk solid. Both gases exhibited a behavior similar to nitrogen. The cross-sectional area found for Ar is 0.121 nm~2. The existence of three adsorption sites found previously has been confirmed.
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