The use of a point polarizable dipole in intermolecular potentials for water

The total dipole moment of a pair of isolated water molecules that employ a point polarizable dipole is compared with the total dipole

moment obtained from MP4 calculations for the same intermolecular

orientation and distance. At all reasonable intermolecular distances,

the point dipole models give total dipole moments that are generally in

very good agreement with MP4. This suggests that the point polarizable

dipole approximation for water is reasonable and that the high dipole

moments obtained frequently in molecular simulations of polarizable

water must be attributed to something other than the inadequacy of the

point dipole approximation.