In this article: http://ambermd.org/antechamber/gaff.pdf, in Table-7, authors have calculated "intermolecular energy" of a molecule set. I wonder how can I calculate this energy by using gaussian09 and amber-17? Is there any tutorial ? or what is the way for this? I need to calculate this energy to prove my "new force field parameters are correct" but I really don't know this. Thank you.