<p>The <a class="reference internal" href="pair_modify.html"><span class="doc">pair_modify</span></a> command sets options for mixing of
type I-J interaction coefficients and adding energy offsets or tail
corrections to Lennard-Jones potentials. Details on these options as
they pertain to individual potentials are described on the doc page
for the potential. Likewise, info on whether the potential
information is stored in a <a class="reference internal" href="write_restart.html"><span class="doc">restart file</span></a> is listed
on the potential doc page.</p>
<p>In the formulas listed for each pair style, <em>E</em> is the energy of a
pairwise interaction between two atoms separated by a distance <em>r</em>.
The force between the atoms is the negative derivative of this
expression.</p>
<p>If the pair_style command has a cutoff argument, it sets global
cutoffs for all pairs of atom types. The distance(s) can be smaller
or larger than the dimensions of the simulation box.</p>
<p>Typically, the global cutoff value can be overridden for a specific
pair of atom types by the <a class="reference internal" href="pair_coeff.html"><span class="doc">pair_coeff</span></a> command. The
pair style settings (including global cutoffs) can be changed by a
subsequent pair_style command using the same style. This will reset
the cutoffs for all atom type pairs, including those previously set
explicitly by a <a class="reference internal" href="pair_coeff.html"><span class="doc">pair_coeff</span></a> command. The exceptions
to this are that pair_style <em>table</em> and <em>hybrid</em> settings cannot be
reset. A new pair_style command for these styles will wipe out all
previously specified pair_coeff values.</p>
<hr class="docutils" />
<p>Here is an alphabetic list of pair styles defined in LAMMPS. They are
also given in more compact form in the pair section of <a class="reference internal" href="Section_commands.html#cmd-5"><span class="std std-ref">this page</span></a>.</p>
<p>Click on the style to display the formula it computes, arguments
specified in the pair_style command, and coefficients specified by the
<li><a class="reference internal" href="pair_born.html"><span class="doc">pair_style born/coul/wolf</span></a> - Born-Mayer-Huggins with Coulombics via Wolf potential</li>
<li><a class="reference internal" href="pair_brownian.html"><span class="doc">pair_style brownian</span></a> - Brownian potential for Fast Lubrication Dynamics</li>
<li><a class="reference internal" href="pair_brownian.html"><span class="doc">pair_style brownian/poly</span></a> - Brownian potential for Fast Lubrication Dynamics with polydispersity</li>
<li><a class="reference internal" href="pair_kim.html"><span class="doc">pair_style kim</span></a> - interface to potentials provided by KIM project</li>
<li><a class="reference internal" href="pair_class2.html"><span class="doc">pair_style lj/class2</span></a> - COMPASS (class 2) force field with no Coulomb</li>
<li><a class="reference internal" href="pair_lubricateU.html"><span class="doc">pair_style lubricateU</span></a> - hydrodynamic lubrication forces for Fast Lubrication Dynamics</li>
<li><a class="reference internal" href="pair_lubricateU.html"><span class="doc">pair_style lubricateU/poly</span></a> - hydrodynamic lubrication forces for Fast Lubrication with polydispersity</li>
<p>Some pair styles are part of specific packages. They are only enabled
if LAMMPS was built with that package. See the <a class="reference internal" href="Section_start.html#start-3"><span class="std std-ref">Making LAMMPS</span></a> section for more info on packages.
The doc pages for individual pair potentials tell if it is part of a
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