SPC model of water: Difference between revisions

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The '''simple point charge''' (SPC) model is an [[List of empirical water models | empirical model of water]]. The molecule is modelled as
The '''simple point charge''' (SPC) model is an [[List of empirical 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:Water_empirical1.png|center|300px]]
[[Image:Thee_site_water_model.png‎|center|400px]]
{| border="1"
{| border="1"
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|-
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| <math>q_{\mathrm{H}}</math> ||  <math>q_{\mathrm{O}}/2</math> (charge neutrality)
| <math>q_{\mathrm{H}}</math> ||  <math>q_{\mathrm{O}}/2</math> (charge neutrality)
|-
| <math>r_\mathrm{OM}</math> ||  <math>0</math> (charge sits on oxygen)
|}
|}



Revision as of 17:21, 8 June 2009

This article is a 'stub' about water and/or ice. It has no, or next to no, content. It is here at the moment to help form part of the structure of SklogWiki. If you add material to this article, remove the {{Stub-water}} template from this page.

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
kJ mol-1
(charge neutrality)

The SPC model has a dipole moment of 2.27 D.


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).