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dihedral_opls.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

			dihedral_style opls command :h3

			[Syntax:]

			dihedral_style opls :pre

			[Examples:]

			dihedral_style opls
			dihedral_coeff 1 90.0 90.0 90.0 70.0 :pre

			[Description:]

			The {opls} dihedral style uses the potential

			:c,image(Eqs/dihedral_opls.jpg)

			Note that the usual 1/2 factor is not included in the K values.

			This dihedral potential is used in the OPLS force field and is
			described in "(Watkins)"_#Watkins.

			The following coefficients must be defined for each dihedral type via the
			"dihedral_coeff"_dihedral_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:

			K1 (energy)
			K2 (energy)
			K3 (energy)
			K4 (energy) :ul

			[Restrictions:]

			This dihedral 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:]

			"dihedral_coeff"_dihedral_coeff.html

			[Default:] none

			:line

			:link(Watkins)
			[(Watkins)] Watkins and Jorgensen, J Phys Chem A, 105, 4118-4125 (2001).