SPC model of water

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The simple point charge empirical model (SPC) of water. The molecule is modelled as a rigid isosceles triangle, with charge sites at each of the three atoms. Apart from Coulomb interactions, the molecules interact via long-range Lennard-Jones sites only at Oxygen atoms. The parameters are as follows:

Water empirical1.png
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)


  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).