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The first molecular dynamics simulation including many-body effects that account for the experimental results from a structural and dynamic point of view is presented. It is shown that molecular dynamics simulations with an accurate polarizable force field and a cluster approach would be a valuable alternative without losing information in the description of the microscopic system.

The building of a model potential, including polarization energy as an n-body term, for the interaction between alkali cations [from Na(super +) to Cs(super +)] and three different solvent molecules (water, methanol and DME), is discussed. A precision comparable to that of ab initio results can be obtained by taking into account the anisotropy of the electric dipole polarizability tensor for the solvent.