Lennard-Jones model

Lennard-Jones Potential:

$V(r)=4\epsilon \left[\left({\frac {\sigma }{r}}\right)^{12}-\left({\frac {\sigma }{r}}\right)^{6}\right]$

where:

V(r): Potential energy of interaction betweeen two particles at a distance r;

σ: Diameter (length);

ε: well depth (energy)

References

J. E. Lennard-Jones "Cohesion", Proc. Phys. Soc. Lond. volume 43 pages 461 (1931)