The general Lennard-Jones potential combines a repulsive potential, 1 / r n , with an attractive potential, − − 1 / r m , using empirically determined coefficients A n and B m : V LJ ( r ) = A n r n − − B m r m . In his 1931 review Lennard-Jones suggested using m = 6 to match the London dispersion force and n = 12 based matching experimental data. Setting A n = 4 ε ε σ σ 12 and B m = 4 ε ε σ σ 6 gives the widely used Lennard-Jones 12-6 potential: V LJ ( r ) = 4 ε ε [ ( σ σ r ) 12 − − ( σ σ r ) 6 ] , where r is the distance between two interacting particles, ε is the depth of the potential well, and σ is the distance at which the particle-particle potential energy V is zero. The Lennard-Jones 12-6 potential has its minimum at a distance of r = r m i n = 2 1 / 6 σ σ , where the potential energy has the value V = − − ε ε .