CAN LENNARD-JONES PARTICLES WITH 4 BONDING SITES REALISTICALLY MODEL WATER

The fluid of Lennard-Jones particles with four bonding sites, introduc ed recently as a realistic substitute of hard-core models, has been in vestigated by computer simulations. It is shown that, within the range of potential parameters originally considered, the structure of this fluid is typically normal-fluid-like and does not reproduce any struct ural features typical of associating fluids. By considerably increasin g the strength of association, the structure becomes, but only qualita tively, water-like and similar to the structure produced by the origin al hard-core models.