# Module MMTK.ForceFields.BondFF

## Class HarmonicForceField: Simplified harmonic force field for normal mode calculations

Constructor: HarmonicForceField()

This force field is made up of the bonded terms from the Amber 94 force field with the equilibrium positions of all terms changed to the corresponding values in the input configuration, such that the input configuration becomes an energy minimum by construction. The nonbonded terms are replaced by a generic short-ranged deformation term.

See [Hinsen1999b] for a description of this force field, and [Viduna2000] for an application to DNA.