Sb energy1

The force field terms
The energy function of the latest CHARMM force field [TODO: add refs] has the following form $$U_{CHARMM}=U_{bonded}+U_{nonbonded}$$

We note in passing that CHARMM can compute energies and forces with other forcefields, included converted versions of the AMBER and OPLS-AA forcefield, but also the Merck force field. [TODO: add refs] Use of these force fields is beyond the scope of this tutorial.