# angle_style mm3 command

## Syntax

angle_style mm3


## Examples

angle_style mm3
angle_coeff 1 100.0 107.0


## Description

The mm3 angle style uses the potential that is anharmonic in the angle as defined in (Allinger)

where theta0 is the equilibrium value of the angle, and K is a prefactor. The anharmonic prefactors have units deg^(-n), for example -0.014 deg^(-1), 5.6(10)^(-5) deg^(-2), …

The following coefficients must be defined for each angle type via the angle_coeff command as in the example above, or in the data file or restart files read by the read_data or read_restart commands: