Penetrable square well model

The penetrable square well model is given by :

\[ \Phi_{12}\left( r \right) = \left\{ \begin{array}{ccc} \epsilon_r & ; & r < \sigma \\ - \epsilon_a & ; &\sigma \le r < \sigma + \Delta\\ 0 & ; & r \ge \sigma + \Delta\end{array} \right. \]

where \(\Phi_{12}(r)\) is the intermolecular pair potential, \(\epsilon_r\) is the hight of the repulsive core and \(\epsilon_a\) is the attractive well depth, \(r\) is the distance between site 1 and site 2 \(r := |\mathbf{r}_1 - \mathbf{r}_2|\).

References

Related reading

• Riccardo Fantoni, Alexandr Malijevský, Andrés Santos and Achille Giacometti "The penetrable square-well model: extensive versus non-extensive phases", Molecular Physics 109 pp. 2723-2736 (2011)