SPC model of water: Difference between revisions
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The '''simple point charge''' (SPC) model | The '''simple point charge''' (SPC) model | ||
<ref>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)</ref> | <ref>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)</ref> | ||
is an [[ | is an [[water models | 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 model | Lennard-Jones]] sites, situated on the oxygen atoms. The parameters are as follows: | 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 model | Lennard-Jones]] sites, situated on the oxygen atoms. The parameters are as follows: | ||
[[Image:Thee_site_water_model.png|center|400px]] | [[Image:Thee_site_water_model.png|center|400px]] | ||
Revision as of 13:02, 12 June 2009
The simple point charge (SPC) model [1] 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 |
| kJ mol-1 | |
| (charge neutrality) |
The SPC model has a dipole moment of 2.27 D.
Related models
Over the years a number of variants of the SPC model have been published:
References
- ↑ 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)