Editing Weeks-Chandler-Andersen perturbation theory

The '''Weeks-Chandler-Andersen perturbation theory''' <ref>[http://dx.doi.org/10.1063/1.1674820     John D. Weeks, David Chandler and Hans C. Andersen "Role of Repulsive Forces in Determining the Equilibrium Structure of Simple Liquids", Journal of Chemical Physics '''54''' pp. 5237-5247 (1971)]</ref> is based on the following
decomposition of the [[intermolecular pair potential]] (in particular, the [[Lennard-Jones model | Lennard-Jones potential]]):

The reference system pair potential is given by (Eq, 4):

:<math>
\Phi_{\rm repulsive} (r) = \left\{ 
\begin{array}{ll}
\Phi_{\rm LJ}(r) + \epsilon & {\rm if} \; r < 2^{1/6}\sigma \\
0 &  {\rm if} \; r \ge 2^{1/6}\sigma 
\end{array} \right.
</math>

and the perturbation potential is given by (Eq, 5 Ref. 1):

:<math>
\Phi_{\rm attractive} (r) = \left\{ 
\begin{array}{ll}
-\epsilon & {\rm if} \; r < 2^{1/6}\sigma \\
\Phi_{\rm LJ}(r) &  {\rm if} \; r \ge 2^{1/6}\sigma 
\end{array} \right.
</math>
==Ben-Amotz-Stell reformulation==
<ref>[http://dx.doi.org/10.1021/jp037810s  Dor Ben-Amotz and George Stell "Reformulation of Weeks-Chandler-Andersen Perturbation Theory Directly in Terms of a Hard-Sphere Reference System", Journal of Physical Chemistry B '''108''' pp. 6877-6882 (2004)]</ref>
==Colloids==
The repulsive component of the WCA decomposition has been used as a model for [[colloids]] <ref>[http://dx.doi.org/10.1063/1.3572059 L. Filion, R. Ni, D. Frenkel, and M. Dijkstra "Simulation of nucleation in almost hard-sphere colloids: The discrepancy between experiment and simulation persists", Journal of Chemical Physics '''134''' 134901 (2011)]</ref>.
==References==
<references/>
[[category: perturbation theory]]