There's been some discussion lately on dissociative water models, and I
saw this paper http://dx.doi.org/10.1021/jp072530o, which may be of
interest to some people.
Dissociative Water Potential for Molecular Dynamics Simulations
T. S. Mahadevan and S. H. Garofalini*
J. Phys. Chem. B; 2007; ASAP Web Release Date: 30-Jun-2007
A new interatomic potential for dissociative water was developed for use
in molecular dynamics simulations. The simulations use a multibody
potential, with both pair and three-body terms, and the Wolf summation
method for the long-range Coulomb interactions. A major feature in the
potential is the change in the short-range O-H repulsive interaction as
a function of temperature and/or pressure in order to reproduce the
density-temperature curve between 273 K and 373 at 1 atm, as well as
high-pressure data at various temperatures. Using only the change in
this one parameter, the simulations also reproduce room-temperature
properties of water, such as the structure, cohesive energy, diffusion
constant, and vibrational spectrum, as well as the liquid-vapor
coexistence curve. Although the water molecules could dissociate, no
dissociation is observed at room temperature. However, behavior of the
hydronium ion was studied by introduction of an extra H+ into a cluster
of water molecules. Both Eigen and Zundel configurations, as well as
more complex configurations, are observed in the migration of the hydronium.
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