improper_style_harmonic.txt
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improper_style_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)

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			improper_style harmonic command :h3

			[Syntax:]

			improper_style harmonic :pre

			[Examples:]

			improper_style harmonic
			improper_coeff 1 100.0 0 :pre

			[Description:]

			The {harmonic} improper style uses the potential

			:c,image(Eqs/improper_harmonic.jpg)

			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"_improper_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)
			X0 (degrees) :ul

			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:]

			"improper_coeff"_improper_coeff.html

			[Default:] none