I want to implement the Tersoff bond order potential form in GULP. The manual indicates that there are three choices (cosine, mdf and murty) for the taper function f(r). I was wondering what are the exact equations for these taper funcrtions that are implemented in GULP. The form of the taper/cut-off function I am looking for is attached here. Is this form achievable in GULP?
Thanks for your help.