Coulomb: public feasst::ModelTwoBody¶
Compute energy between two point charges, \(q_i\) and \(q_j\) with a plain Coulomb potential.
\(U = q_i q_j \chi/r\)
where \(r\) is the separation distance, and \(\chi\) is the charge conversion factor assuming the following units:
Avoid Coulomb explosion by returning a large number when \(r\) is near zero.