I am using the CHARMM-TIP3P parameters (parameterized for a cutoff) and not the improved parameters for long range electrostatics, but I think either set of parameters should vaporize at 1500 K and be a liquid at 300 K. I will look at forces between two waters or in an even simpler system of 1 NaCl in a large box to see if they are correct.
Has anyone used this potential (lj/charmm/coul/charmm) recently?
Brian Novak