Syntax:
improper_style harmonic
Examples:
improper_style harmonic improper_coeff 1 100.0 0
Description:
The harmonic improper style uses the potential
where X is the improper angle, X0 is its equilibrium value, and K is a prefactor. Note that the usual 1/2 factor is included in K.
The following coefficients must be defined for each improper type via the improper_coeff command as in the example above, or in the data file or restart files read by the read_data or read_restart commands:
X0 is specified in degrees, but LAMMPS converts it to radians internally; hence the units of K are in energy/radian^2.
Restrictions: none
Related commands:
Default: none