A molecular dynamics study of the connectivity of water molecules in supercooled states

We examined the distributions of four-coordinated supercooled water molecul es in two state points where the densities differ considerably. It is found that although the coordination numbers are all four in local energy minimu m structures free from thermal excitation, the magnitude of the connectivit y of tetrahedrally coordinated molecules differs significantly between two supercooled states. We also investigated the thermodynamic properties of li quids composed of two kinds of deformed water molecules having wider bond a ngles in order to compare the properties of these liquids with those of a r ealistic water model.