Penetrable square well model

The penetrable square well model is given by :

${\mathrm{\Phi }}_{12}(r)=\{\begin{array}{ccc}{ϵ}_r& ;& r<\sigma \\ -{ϵ}_a& ;& \sigma \le r<\sigma +\mathrm{\Delta }\\ 0& ;& r\ge \sigma +\mathrm{\Delta }\end{array}$

where ${\mathrm{\Phi }}_{12}(r)$ is the intermolecular pair potential, ${ϵ}_r$ is the hight of the repulsive core and ${ϵ}_a$ 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)