bond_class2.html
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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#start_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).
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