I am having trouble using the non-bonded terms in energy minimization routines in XPLOR-NIH.
The way I read the docs is that if I turn repel off ( repel=0) I get the L-J force, which has both attractive and repulsive terms, I realize that the replusive term overwhelms the attractive at close radii, but I have yet to see any attractive force whatsoever regardless of where my atoms are and what the cut* values are. I feel like I am missing something - could someone show me what the magic combination of nbonds parameters turn on an attractive force? All I ever get is atoms pushing each other away. Thanks- Tom
