angle_harmonic.txt
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	"LAMMPS WWW Site"_lws - "LAMMPS Documentation"_ld - "LAMMPS Commands"_lc :c

	:link(lws,http://lammps.sandia.gov)
	:link(ld,Manual.html)
	:link(lc,Section_commands.html#comm)

	:line

	angle_style harmonic command :h3

	[Syntax:]

	angle_style harmonic :pre

	[Examples:]

	angle_style harmonic
	angle_coeff 1 300.0 107.0 :pre

	[Description:]

	The {harmonic} angle style uses the potential

	:c,image(Eqs/angle_harmonic.jpg)

	where theta0 is the equilibrium value of the angle, and K is a
	prefactor. Note that the usual 1/2 factor is included in K.

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

	K (energy/radian^2)
	theta0 (degrees) :ul

	Theta0 is specified in degrees, but LAMMPS converts it to radians
	internally; hence the units of K are in energy/radian^2.

	[Restrictions:] none

	This angle style can only be used if LAMMPS was built with the
	"molecular" package (which it is by default). See the "Making
	LAMMPS"_Section_start.html#2_3 section for more info on packages.

	[Related commands:]

	"angle_coeff"_angle_coeff.html

	[Default:] none