LB2

This keyword specifies the potential[17,18,19]

$$V = \frac{\epsilon}{2} \sum_{i<j} \left[ \left(\frac{r_{ij}}{\sigma}\right)^2+ \left(\frac{\sigma}{r_{ij}}\right)^2 \right],$$ (3)

where $\epsilon$ and $\sigma$ are set to unity.