3 Interaction function and force fields
4 =====================================
6 To accommodate the potential functions used in some popular force fields
7 (see :ref:`ff`), |Gromacs| offers a choice of functions, both for
8 non-bonded interaction and for dihedral interactions. They are described
9 in the appropriate subsections.
11 The potential functions can be subdivided into three parts
13 #. *Non-bonded*: Lennard-Jones or Buckingham, and Coulomb or modified
14 Coulomb. The non-bonded interactions are computed on the basis of a
15 neighbor list (a list of non-bonded atoms within a certain radius),
16 in which exclusions are already removed.
18 #. *Bonded*: covalent bond-stretching, angle-bending, improper
19 dihedrals, and proper dihedrals. These are computed on the basis of
22 #. *Restraints*: position restraints, angle restraints, distance
23 restraints, orientation restraints and dihedral restraints, all based
26 #. *Applied Forces*: externally applied forces, see
27 chapterĀ :ref:`special`.
33 functions/nonbonded-interactions
34 functions/bonded-interactions
36 functions/polarization
37 functions/free-energy-interactions
38 functions/interaction-methods
39 functions/long-range-electrostatics
40 functions/long-range-vdw