MW model of water

The mW model ^[1] of water is an atom with tetrahedrality intermediate between carbon and silicon. mW mimics the hydrogen-bonded structure of water through the introduction of a nonbond angular dependent term that encourages tetrahedral configurations. The model is given by:

E=\sum _{i}\sum _{j>i}\Phi _{ij}(r_{ij})+\sum _{i}\sum _{j\neq i}\sum _{k>j}\Phi _{ijk}(r_{ij},r_{ik},\theta _{ijk})

where

\Phi _{ij}(r_{ij})=A\epsilon \left[B\left({\frac {\sigma }{r}}\right)^{p}-\left({\frac {\sigma }{r}}\right)^{q}\right]\exp \left({\frac {\sigma }{r-a\sigma }}\right)

and

Failed to parse (Conversion error. Server ("https://wikimedia.org/api/rest_") reported: "Cannot get mml. Server problem."): {\displaystyle \Phi _{ijk}(r_{ij},s_{ik},\theta _{ijk})=\lambda \epsilon \left[\cos \theta -\cos \theta _{0}\right]^{2}\exp \left({\frac {\gamma \sigma }{r-a\sigma }}\right)\exp \left({\frac {\gamma \sigma }{s-a\sigma }}\right)}

where

Failed to parse (Conversion error. Server ("https://wikimedia.org/api/rest_") reported: "Cannot get mml. Server problem."): {\displaystyle A=7.049556277} , $B=0.6022245584$ , Failed to parse (Conversion error. Server ("https://wikimedia.org/api/rest_") reported: "Cannot get mml. Server problem."): {\displaystyle p=4} , Failed to parse (Conversion error. Server ("https://wikimedia.org/api/rest_") reported: "Cannot get mml. Server problem."): {\displaystyle q=0} , and $\gamma =1.2$