SPC model of water

The simple point charge (SPC) model is an empirical model of water. The molecule is modelled as a rigid isosceles triangle, having charges situated on each of the three atoms. Apart from Coulombic interactions, the molecules interact via long-range Lennard-Jones sites, situated on the oxygen atoms. The parameters are as follows:

parameter	value
$\sigma$	$3.166 {\mathrm {\AA}}$
$\epsilon$	$0.650$ kJ mol-1
$r_\mathrm{OH}$	$1.000\mathrm{\AA}$
$\angle_\mathrm{HOH}$	$109.47^{\circ}$
$q_{\mathrm{O}}$	$-0.82 e$
$q_{\mathrm{H}}$	$q_{\mathrm{O}}/2$ (charge neutrality)
$r_\mathrm{OM}$	$0$ (charge sits on oxygen)

References

1. H. J. C. Berendsen, J. P. M. Postma, W. F. van Gunsteren and J. Hermans, in: Intermolecular Forces (B. Pullman, ed.), Reidel, Dordrecht, p. 331 (1981).