Development of an improved four-site water model for biomolecular simulations: TIP4P-Ew

A four-site water model, TIP4P-Ew, was developed for biomolecular simulations. It was observed that TIP4P-Ew potential had a potential density maximum at ∼ 1 °C. It was found that the model reproduced bulk-densities and the enthalpy of vaporization from -37.5 to 127 °C at 1 atm. The results show that structural properties of the water model are in good agreement with the x-ray scattering intensities between 0 and 77 °C.