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	<CENTER><A HREF = "http://lammps.sandia.gov">LAMMPS WWW Site</A> - <A HREF = "Manual.html">LAMMPS Documentation</A> - <A HREF = "Section_commands.html#comm">LAMMPS Commands</A>
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	<H3>bond_style class2 command
	</H3>
	<P><B>Syntax:</B>
	</P>
	<PRE>bond_style class2
	</PRE>
	<P><B>Examples:</B>
	</P>
	<PRE>bond_style class2
	bond_coeff 1 1.0 100.0 80.0 80.0
	</PRE>
	<P><B>Description:</B>
	</P>
	<P>The <I>class2</I> bond style uses the potential
	</P>
	<CENTER><IMG SRC = "Eqs/bond_class2.jpg">
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	<P>where r0 is the equilibrium bond distance.
	</P>
	<P>See <A HREF = "#Sun">(Sun)</A> for a description of the COMPASS class2 force field.
	</P>
	<P>The following coefficients must be defined for each bond type via the
	<A HREF = "bond_coeff.html">bond_coeff</A> command as in the example above, or in
	the data file or restart files read by the <A HREF = "read_data.html">read_data</A>
	or <A HREF = "read_restart.html">read_restart</A> commands:
	</P>
	<UL><LI>R0 (distance)
	<LI>K2 (energy/distance^2)
	<LI>K3 (energy/distance^3)
	<LI>K4 (energy/distance^4)
	</UL>
	<P><B>Restrictions:</B>
	</P>
	<P>This bond style can only be used if LAMMPS was built with the "class2"
	package. See the <A HREF = "Section_start.html#2_3">Making LAMMPS</A> section for
	more info on packages.
	</P>
	<P><B>Related commands:</B>
	</P>
	<P><A HREF = "bond_coeff.html">bond_coeff</A>, <A HREF = "delete_bonds.html">delete_bonds</A>
	</P>
	<P><B>Default:</B> none
	</P>
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	<A NAME = "Sun"></A>

	<P><B>(Sun)</B> Sun, J Phys Chem B 102, 7338-7364 (1998).
	</P>
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