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lammps/doc/html/pair_comb.html
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<title>pair_style comb command &mdash; LAMMPS documentation</title>
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<div class="lammps_version">Version: <b>19 Nov 2024</b></div>
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<li class="toctree-l1"><a class="reference internal" href="Intro.html">1. Introduction</a></li>
<li class="toctree-l1"><a class="reference internal" href="Install.html">2. Install LAMMPS</a></li>
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<p class="caption" role="heading"><span class="caption-text">Programmer Guide</span></p>
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<li class="toctree-l1"><a class="reference internal" href="Library.html">1. LAMMPS Library Interfaces</a></li>
<li class="toctree-l1"><a class="reference internal" href="Python_head.html">2. Use Python with LAMMPS</a></li>
<li class="toctree-l1"><a class="reference internal" href="Modify.html">3. Modifying &amp; extending LAMMPS</a></li>
<li class="toctree-l1"><a class="reference internal" href="Developer.html">4. Information for Developers</a></li>
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<p class="caption" role="heading"><span class="caption-text">Command Reference</span></p>
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<li class="toctree-l1"><a class="reference internal" href="commands_list.html">Commands</a></li>
<li class="toctree-l1"><a class="reference internal" href="fixes.html">Fix Styles</a></li>
<li class="toctree-l1"><a class="reference internal" href="computes.html">Compute Styles</a></li>
<li class="toctree-l1 current"><a class="reference internal" href="pairs.html">Pair Styles</a><ul class="current">
<li class="toctree-l2"><a class="reference internal" href="pair_adp.html">pair_style adp command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_agni.html">pair_style agni command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_aip_water_2dm.html">pair_style aip/water/2dm command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_airebo.html">pair_style airebo command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_airebo.html#pair-style-airebo-morse-command">pair_style airebo/morse command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_airebo.html#pair-style-rebo-command">pair_style rebo command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_amoeba.html">pair_style amoeba command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_amoeba.html#pair-style-hippo-command">pair_style hippo command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_atm.html">pair_style atm command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_awpmd.html">pair_style awpmd/cut command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_beck.html">pair_style beck command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_body_nparticle.html">pair_style body/nparticle command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_body_rounded_polygon.html">pair_style body/rounded/polygon command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_body_rounded_polyhedron.html">pair_style body/rounded/polyhedron command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_bop.html">pair_style bop command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_born.html">pair_style born command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_born.html#pair-style-born-coul-long-command">pair_style born/coul/long command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_born.html#pair-style-born-coul-msm-command">pair_style born/coul/msm command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_born.html#pair-style-born-coul-wolf-command">pair_style born/coul/wolf command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_born.html#pair-style-born-coul-dsf-command">pair_style born/coul/dsf command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_born_gauss.html">pair_style born/gauss command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_bpm_spring.html">pair_style bpm/spring command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_brownian.html">pair_style brownian command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_brownian.html#pair-style-brownian-poly-command">pair_style brownian/poly command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_buck.html">pair_style buck command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_buck.html#pair-style-buck-coul-cut-command">pair_style buck/coul/cut command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_buck.html#pair-style-buck-coul-long-command">pair_style buck/coul/long command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_buck.html#pair-style-buck-coul-msm-command">pair_style buck/coul/msm command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_buck6d_coul_gauss.html">pair_style buck6d/coul/gauss/dsf command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_buck6d_coul_gauss.html#pair-style-buck6d-coul-gauss-long-command">pair_style buck6d/coul/gauss/long command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_buck_long.html">pair_style buck/long/coul/long command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_charmm.html">pair_style lj/charmm/coul/charmm command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_charmm.html#pair-style-lj-charmm-coul-charmm-implicit-command">pair_style lj/charmm/coul/charmm/implicit command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_charmm.html#pair-style-lj-charmm-coul-long-command">pair_style lj/charmm/coul/long command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_charmm.html#pair-style-lj-charmm-coul-msm-command">pair_style lj/charmm/coul/msm command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_charmm.html#pair-style-lj-charmmfsw-coul-charmmfsh-command">pair_style lj/charmmfsw/coul/charmmfsh command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_charmm.html#pair-style-lj-charmmfsw-coul-long-command">pair_style lj/charmmfsw/coul/long command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_class2.html">pair_style lj/class2 command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_class2.html#pair-style-lj-class2-coul-cut-command">pair_style lj/class2/coul/cut command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_class2.html#pair-style-lj-class2-coul-long-command">pair_style lj/class2/coul/long command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_colloid.html">pair_style colloid command</a></li>
<li class="toctree-l2 current"><a class="current reference internal" href="#">pair_style comb command</a></li>
<li class="toctree-l2"><a class="reference internal" href="#pair-style-comb3-command">pair_style comb3 command</a><ul>
<li class="toctree-l3"><a class="reference internal" href="#syntax">Syntax</a></li>
<li class="toctree-l3"><a class="reference internal" href="#examples">Examples</a></li>
<li class="toctree-l3"><a class="reference internal" href="#description">Description</a></li>
<li class="toctree-l3"><a class="reference internal" href="#mixing-shift-table-tail-correction-restart-rrespa-info">Mixing, shift, table, tail correction, restart, rRESPA info</a></li>
<li class="toctree-l3"><a class="reference internal" href="#restrictions">Restrictions</a></li>
<li class="toctree-l3"><a class="reference internal" href="#related-commands">Related commands</a></li>
<li class="toctree-l3"><a class="reference internal" href="#default">Default</a></li>
</ul>
</li>
<li class="toctree-l2"><a class="reference internal" href="pair_cosine_squared.html">pair_style cosine/squared command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_coul.html">pair_style coul/cut command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_coul.html#pair-style-coul-cut-global-command">pair_style coul/cut/global command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_coul.html#pair-style-coul-ctip-command">pair_style coul/ctip command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_coul.html#pair-style-coul-debye-command">pair_style coul/debye command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_coul.html#pair-style-coul-dsf-command">pair_style coul/dsf command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_coul.html#pair-style-coul-exclude-command">pair_style coul/exclude command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_coul.html#pair-style-coul-long-command">pair_style coul/long command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_coul.html#pair-style-coul-msm-command">pair_style coul/msm command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_coul.html#pair-style-coul-streitz-command">pair_style coul/streitz command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_coul.html#pair-style-coul-wolf-command">pair_style coul/wolf command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_coul.html#pair-style-tip4p-cut-command">pair_style tip4p/cut command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_coul.html#pair-style-tip4p-long-command">pair_style tip4p/long command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_coul_diel.html">pair_style coul/diel command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_coul_shield.html">pair_style coul/shield command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_coul_slater.html">pair_style coul/slater command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_coul_slater.html#pair-style-coul-slater-cut-command">pair_style coul/slater/cut command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_coul_slater.html#pair-style-coul-slater-long-command">pair_style coul/slater/long command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_coul_tt.html">pair_style coul/tt command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_cs.html">pair_style born/coul/dsf/cs command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_cs.html#pair-style-born-coul-long-cs-command">pair_style born/coul/long/cs command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_cs.html#pair-style-born-coul-wolf-cs-command">pair_style born/coul/wolf/cs command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_cs.html#pair-style-buck-coul-long-cs-command">pair_style buck/coul/long/cs command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_cs.html#pair-style-coul-long-cs-command">pair_style coul/long/cs command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_cs.html#pair-style-coul-wolf-cs-command">pair_style coul/wolf/cs command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_cs.html#pair-style-lj-cut-coul-long-cs-command">pair_style lj/cut/coul/long/cs command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_cs.html#pair-style-lj-class2-coul-long-cs-command">pair_style lj/class2/coul/long/cs command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_dielectric.html">pair_style coul/cut/dielectric command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_dielectric.html#pair-style-coul-long-dielectric-command">pair_style coul/long/dielectric command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_dielectric.html#pair-style-lj-cut-coul-cut-dielectric-command">pair_style lj/cut/coul/cut/dielectric command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_dielectric.html#pair-style-lj-cut-coul-debye-dielectric-command">pair_style lj/cut/coul/debye/dielectric command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_dielectric.html#pair-style-lj-cut-coul-long-dielectric-command">pair_style lj/cut/coul/long/dielectric command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_dielectric.html#pair-style-lj-cut-coul-msm-dielectric-command">pair_style lj/cut/coul/msm/dielectric command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_dielectric.html#pair-style-lj-long-coul-long-dielectric-command">pair_style lj/long/coul/long/dielectric command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_dipole.html">pair_style lj/cut/dipole/cut command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_dipole.html#pair-style-lj-sf-dipole-sf-command">pair_style lj/sf/dipole/sf command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_dipole.html#pair-style-lj-cut-dipole-long-command">pair_style lj/cut/dipole/long command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_dipole.html#pair-style-lj-long-dipole-long-command">pair_style lj/long/dipole/long command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_dpd.html">pair_style dpd command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_dpd.html#pair-style-dpd-tstat-command">pair_style dpd/tstat command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_dpd_coul_slater_long.html">pair_style dpd/coul/slater/long command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_dpd_ext.html">pair_style dpd/ext command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_dpd_ext.html#pair-style-dpd-ext-tstat-command">pair_style dpd/ext/tstat command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_dpd_fdt.html">pair_style dpd/fdt command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_dpd_fdt.html#pair-style-dpd-fdt-energy-command">pair_style dpd/fdt/energy command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_drip.html">pair_style drip command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_dsmc.html">pair_style dsmc command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_e3b.html">pair_style e3b command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_eam.html">pair_style eam command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_eam.html#pair-style-eam-alloy-command">pair_style eam/alloy command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_eam.html#pair-style-eam-cd-command">pair_style eam/cd command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_eam.html#pair-style-eam-cd-old-command">pair_style eam/cd/old command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_eam.html#pair-style-eam-fs-command">pair_style eam/fs command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_eam.html#pair-style-eam-he-command">pair_style eam/he command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_edip.html">pair_style edip command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_edip.html#pair-style-edip-multi-command">pair_style edip/multi command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_eff.html">pair_style eff/cut command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_eim.html">pair_style eim command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_exp6_rx.html">pair_style exp6/rx command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_extep.html">pair_style extep command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_fep_soft.html">pair_style lj/cut/soft command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_fep_soft.html#pair-style-lj-cut-coul-cut-soft-command">pair_style lj/cut/coul/cut/soft command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_fep_soft.html#pair-style-lj-cut-coul-long-soft-command">pair_style lj/cut/coul/long/soft command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_fep_soft.html#pair-style-lj-cut-tip4p-long-soft-command">pair_style lj/cut/tip4p/long/soft command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_fep_soft.html#pair-style-lj-charmm-coul-long-soft-command">pair_style lj/charmm/coul/long/soft command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_fep_soft.html#pair-style-lj-class2-soft-command">pair_style lj/class2/soft command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_fep_soft.html#pair-style-lj-class2-coul-cut-soft-command">pair_style lj/class2/coul/cut/soft command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_fep_soft.html#pair-style-lj-class2-coul-long-soft-command">pair_style lj/class2/coul/long/soft command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_fep_soft.html#pair-style-coul-cut-soft-command">pair_style coul/cut/soft command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_fep_soft.html#pair-style-coul-long-soft-command">pair_style coul/long/soft command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_fep_soft.html#pair-style-tip4p-long-soft-command">pair_style tip4p/long/soft command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_fep_soft.html#pair-style-morse-soft-command">pair_style morse/soft command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_gauss.html">pair_style gauss command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_gauss.html#pair-style-gauss-cut-command">pair_style gauss/cut command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_gayberne.html">pair_style gayberne command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_gran.html">pair_style gran/hooke command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_gran.html#pair-style-gran-hooke-history-command">pair_style gran/hooke/history command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_gran.html#pair-style-gran-hertz-history-command">pair_style gran/hertz/history command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_granular.html">pair_style granular command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_gromacs.html">pair_style lj/gromacs command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_gromacs.html#pair-style-lj-gromacs-coul-gromacs-command">pair_style lj/gromacs/coul/gromacs command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_gw.html">pair_style gw command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_gw.html#pair-style-gw-zbl-command">pair_style gw/zbl command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_harmonic_cut.html">pair_style harmonic/cut command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_hbond_dreiding.html">pair_style hbond/dreiding/lj command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_hbond_dreiding.html#pair-style-hbond-dreiding-morse-command">pair_style hbond/dreiding/morse command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_hdnnp.html">pair_style hdnnp command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_hybrid.html">pair_style hybrid command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_hybrid.html#pair-style-hybrid-molecular-command">pair_style hybrid/molecular command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_hybrid.html#pair-style-hybrid-overlay-command">pair_style hybrid/overlay command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_hybrid.html#pair-style-hybrid-scaled-command">pair_style hybrid/scaled command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_ilp_graphene_hbn.html">pair_style ilp/graphene/hbn command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_ilp_tmd.html">pair_style ilp/tmd command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_kim.html">pair_style kim command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_kolmogorov_crespi_full.html">pair_style kolmogorov/crespi/full command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_kolmogorov_crespi_z.html">pair_style kolmogorov/crespi/z command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_lcbop.html">pair_style lcbop command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_lebedeva_z.html">pair_style lebedeva/z command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_lepton.html">pair_style lepton command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_line_lj.html">pair_style line/lj command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_list.html">pair_style list command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_lj.html">pair_style lj/cut command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_lj96.html">pair_style lj96/cut command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_lj_cubic.html">pair_style lj/cubic command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_lj_cut_coul.html">pair_style lj/cut/coul/cut command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_lj_cut_coul.html#pair-style-lj-cut-coul-debye-command">pair_style lj/cut/coul/debye command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_lj_cut_coul.html#pair-style-lj-cut-coul-dsf-command">pair_style lj/cut/coul/dsf command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_lj_cut_coul.html#pair-style-lj-cut-coul-long-command">pair_style lj/cut/coul/long command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_lj_cut_coul.html#pair-style-lj-cut-coul-msm-command">pair_style lj/cut/coul/msm command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_lj_cut_coul.html#pair-style-lj-cut-coul-wolf-command">pair_style lj/cut/coul/wolf command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_lj_cut_sphere.html">pair_style lj/cut/sphere command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_lj_cut_tip4p.html">pair_style lj/cut/tip4p/cut command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_lj_cut_tip4p.html#pair-style-lj-cut-tip4p-long-command">pair_style lj/cut/tip4p/long command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_lj_expand.html">pair_style lj/expand command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_lj_expand.html#pair-style-lj-expand-coul-long-command">pair_style lj/expand/coul/long command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_lj_expand_sphere.html">pair_style lj/expand/sphere command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_lj_long.html">pair_style lj/long/coul/long command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_lj_long.html#pair-style-lj-long-tip4p-long-command">pair_style lj/long/tip4p/long command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_lj_relres.html">pair_style lj/relres command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_lj_smooth.html">pair_style lj/smooth command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_lj_smooth_linear.html">pair_style lj/smooth/linear command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_lj_switch3_coulgauss_long.html">pair_style lj/switch3/coulgauss/long command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_lj_switch3_coulgauss_long.html#pair-style-mm3-switch3-coulgauss-long-command">pair_style mm3/switch3/coulgauss/long command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_local_density.html">pair_style local/density command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_lubricate.html">pair_style lubricate command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_lubricate.html#pair-style-lubricate-poly-command">pair_style lubricate/poly command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_lubricateU.html">pair_style lubricateU command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_lubricateU.html#pair-style-lubricateu-poly-command">pair_style lubricateU/poly command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_mdf.html">pair_style lj/mdf command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_mdf.html#pair-style-buck-mdf-command">pair_style buck/mdf command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_mdf.html#pair-style-lennard-mdf-command">pair_style lennard/mdf command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_meam.html">pair_style meam command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_meam.html#pair-style-meam-ms-command">pair_style meam/ms command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_meam_spline.html">pair_style meam/spline command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_meam_sw_spline.html">pair_style meam/sw/spline command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_mesocnt.html">pair_style mesocnt command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_mesocnt.html#pair-style-mesocnt-viscous-command">pair_style mesocnt/viscous command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_mesodpd.html">pair_style edpd command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_mesodpd.html#pair-style-mdpd-command">pair_style mdpd command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_mesodpd.html#pair-style-mdpd-rhosum-command">pair_style mdpd/rhosum command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_mesodpd.html#pair-style-tdpd-command">pair_style tdpd command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_mgpt.html">pair_style mgpt command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_mie.html">pair_style mie/cut command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_mliap.html">pair_style mliap command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_momb.html">pair_style momb command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_morse.html">pair_style morse command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_morse.html#pair-style-morse-smooth-linear-command">pair_style morse/smooth/linear command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_multi_lucy.html">pair_style multi/lucy command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_multi_lucy_rx.html">pair_style multi/lucy/rx command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_nb3b.html">pair_style nb3b/harmonic command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_nb3b.html#pair-style-nb3b-screened-command">pair_style nb3b/screened command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_nm.html">pair_style nm/cut command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_nm.html#pair-style-nm-cut-split-command">pair_style nm/cut/split command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_nm.html#pair-style-nm-cut-coul-cut-command">pair_style nm/cut/coul/cut command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_nm.html#pair-style-nm-cut-coul-long-command">pair_style nm/cut/coul/long command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_none.html">pair_style none command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_oxdna.html">pair_style oxdna/excv command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_oxdna.html#pair-style-oxdna-stk-command">pair_style oxdna/stk command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_oxdna.html#pair-style-oxdna-hbond-command">pair_style oxdna/hbond command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_oxdna.html#pair-style-oxdna-xstk-command">pair_style oxdna/xstk command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_oxdna.html#pair-style-oxdna-coaxstk-command">pair_style oxdna/coaxstk command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_oxdna2.html">pair_style oxdna2/excv command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_oxdna2.html#pair-style-oxdna2-stk-command">pair_style oxdna2/stk command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_oxdna2.html#pair-style-oxdna2-hbond-command">pair_style oxdna2/hbond command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_oxdna2.html#pair-style-oxdna2-xstk-command">pair_style oxdna2/xstk command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_oxdna2.html#pair-style-oxdna2-coaxstk-command">pair_style oxdna2/coaxstk command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_oxdna2.html#pair-style-oxdna2-dh-command">pair_style oxdna2/dh command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_oxrna2.html">pair_style oxrna2/excv command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_oxrna2.html#pair-style-oxrna2-stk-command">pair_style oxrna2/stk command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_oxrna2.html#pair-style-oxrna2-hbond-command">pair_style oxrna2/hbond command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_oxrna2.html#pair-style-oxrna2-xstk-command">pair_style oxrna2/xstk command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_oxrna2.html#pair-style-oxrna2-coaxstk-command">pair_style oxrna2/coaxstk command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_oxrna2.html#pair-style-oxrna2-dh-command">pair_style oxrna2/dh command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_pace.html">pair_style pace command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_pace.html#pair-style-pace-extrapolation-command">pair_style pace/extrapolation command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_pedone.html">pair_style pedone command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_peri.html">pair_style peri/pmb command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_peri.html#pair-style-peri-lps-command">pair_style peri/lps command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_peri.html#pair-style-peri-ves-command">pair_style peri/ves command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_peri.html#pair-style-peri-eps-command">pair_style peri/eps command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_pod.html">pair_style pod command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_polymorphic.html">pair_style polymorphic command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_python.html">pair_style python command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_quip.html">pair_style quip command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_rann.html">pair_style rann command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_reaxff.html">pair_style reaxff command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_rebomos.html">pair_style rebomos command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_resquared.html">pair_style resquared command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_rheo.html">pair_style rheo command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_rheo_solid.html">pair_style rheo/solid command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_saip_metal.html">pair_style saip/metal command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_sdpd_taitwater_isothermal.html">pair_style sdpd/taitwater/isothermal command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_smatb.html">pair_style smatb command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_smatb.html#pair-style-smatb-single-command">pair_style smatb/single command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_smd_hertz.html">pair_style smd/hertz command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_smd_tlsph.html">pair_style smd/tlsph command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_smd_triangulated_surface.html">pair_style smd/tri_surface command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_smd_ulsph.html">pair_style smd/ulsph command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_smtbq.html">pair_style smtbq command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_snap.html">pair_style snap command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_soft.html">pair_style soft command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_sph_heatconduction.html">pair_style sph/heatconduction command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_sph_idealgas.html">pair_style sph/idealgas command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_sph_lj.html">pair_style sph/lj command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_sph_rhosum.html">pair_style sph/rhosum command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_sph_taitwater.html">pair_style sph/taitwater command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_sph_taitwater_morris.html">pair_style sph/taitwater/morris command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_spica.html">pair_style lj/spica command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_spica.html#pair-style-lj-spica-coul-long-command">pair_style lj/spica/coul/long command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_spica.html#pair-style-lj-spica-coul-msm-command">pair_style lj/spica/coul/msm command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_spin_dipole.html">pair_style spin/dipole/cut command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_spin_dipole.html#pair-style-spin-dipole-long-command">pair_style spin/dipole/long command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_spin_dmi.html">pair_style spin/dmi command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_spin_exchange.html">pair_style spin/exchange command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_spin_exchange.html#pair-style-spin-exchange-biquadratic-command">pair_style spin/exchange/biquadratic command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_spin_magelec.html">pair_style spin/magelec command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_spin_neel.html">pair_style spin/neel command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_srp.html">pair_style srp command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_srp.html#pair-style-srp-react-command">pair_style srp/react command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_sw.html">pair_style sw command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_sw.html#pair-style-sw-mod-command">pair_style sw/mod command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_sw_angle_table.html">pair_style sw/angle/table command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_table.html">pair_style table command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_table_rx.html">pair_style table/rx command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_tersoff.html">pair_style tersoff command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_tersoff.html#pair-style-tersoff-table-command">pair_style tersoff/table command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_tersoff_mod.html">pair_style tersoff/mod command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_tersoff_mod.html#pair-style-tersoff-mod-c-command">pair_style tersoff/mod/c command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_tersoff_zbl.html">pair_style tersoff/zbl command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_thole.html">pair_style thole command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_thole.html#pair-style-lj-cut-thole-long-command">pair_style lj/cut/thole/long command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_threebody_table.html">pair_style threebody/table command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_tracker.html">pair_style tracker command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_tri_lj.html">pair_style tri/lj command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_uf3.html">pair_style uf3 command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_ufm.html">pair_style ufm command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_vashishta.html">pair_style vashishta command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_vashishta.html#pair-style-vashishta-table-command">pair_style vashishta/table command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_wf_cut.html">pair_style wf/cut command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_ylz.html">pair_style ylz command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_yukawa.html">pair_style yukawa command</a></li>
<li class="toctree-l2"><a class="reference internal" href="pair_yukawa_colloid.html">pair_style yukawa/colloid command</a></li>
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<p><span class="math notranslate nohighlight">\(\renewcommand{\AA}{\text{Å}}\)</span></p>
<section id="pair-style-comb-command">
<span id="index-2"></span><span id="index-1"></span><span id="index-0"></span><h1>pair_style comb command<a class="headerlink" href="#pair-style-comb-command" title="Link to this heading"></a></h1>
<p>Accelerator Variants: <em>comb/omp</em></p>
</section>
<section id="pair-style-comb3-command">
<h1>pair_style comb3 command<a class="headerlink" href="#pair-style-comb3-command" title="Link to this heading"></a></h1>
<section id="syntax">
<h2>Syntax<a class="headerlink" href="#syntax" title="Link to this heading"></a></h2>
<div class="highlight-LAMMPS notranslate"><div class="highlight"><pre><span></span><span class="k">pair_style</span><span class="w"> </span><span class="n">comb</span>
<span class="k">pair_style</span><span class="w"> </span><span class="n">comb3</span><span class="w"> </span><span class="n">keyword</span>
</pre></div>
</div>
<pre class="literal-block">keyword = <em>polar</em>
<em>polar</em> value = <em>polar_on</em> or <em>polar_off</em> = whether or not to include atomic polarization</pre>
</section>
<section id="examples">
<h2>Examples<a class="headerlink" href="#examples" title="Link to this heading"></a></h2>
<div class="highlight-LAMMPS notranslate"><div class="highlight"><pre><span></span><span class="k">pair_style</span><span class="w"> </span><span class="n">comb</span>
<span class="k">pair_coeff</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">..</span><span class="o">/</span><span class="n">potentials</span><span class="o">/</span><span class="n">ffield.comb</span><span class="w"> </span><span class="n">Si</span>
<span class="k">pair_coeff</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">..</span><span class="o">/</span><span class="n">potentials</span><span class="o">/</span><span class="n">ffield.comb</span><span class="w"> </span><span class="n">Hf</span><span class="w"> </span><span class="n">Si</span><span class="w"> </span><span class="n">O</span>
<span class="k">pair_style</span><span class="w"> </span><span class="n">comb3</span><span class="w"> </span><span class="n">polar_off</span>
<span class="k">pair_coeff</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">..</span><span class="o">/</span><span class="n">potentials</span><span class="o">/</span><span class="n">ffield.comb3</span><span class="w"> </span><span class="n">O</span><span class="w"> </span><span class="n">Cu</span><span class="w"> </span><span class="n">N</span><span class="w"> </span><span class="n">C</span><span class="w"> </span><span class="n">O</span>
</pre></div>
</div>
</section>
<section id="description">
<h2>Description<a class="headerlink" href="#description" title="Link to this heading"></a></h2>
<p>Style <em>comb</em> computes the second generation variable charge COMB
(Charge-Optimized Many-Body) potential. Style <em>comb3</em> computes the
third-generation COMB potential. These COMB potentials are described
in <a class="reference internal" href="#comb"><span class="std std-ref">(COMB)</span></a> and <a class="reference internal" href="#comb3"><span class="std std-ref">(COMB3)</span></a>. Briefly, the
total energy <span class="math notranslate nohighlight">\(E_T\)</span> of a system of atoms is given by</p>
<div class="math notranslate nohighlight">
\[\begin{split}E_T = &amp; \sum_i [ E_i^{self} (q_i) + \sum_{j&gt;i} [E_{ij}^{short} (r_{ij}, q_i, q_j) + E_{ij}^{Coul} (r_{ij}, q_i, q_j)] + \\
&amp; E^{polar} (q_i, r_{ij}) + E^{vdW} (r_{ij}) + E^{barr} (q_i) + E^{corr} (r_{ij}, \theta_{jik})]\end{split}\]</div>
<p>where <span class="math notranslate nohighlight">\(E_i^{self}\)</span> is the self-energy of atom <em>i</em> (including
atomic ionization energies and electron affinities),
<span class="math notranslate nohighlight">\(E_{ij}^{short}\)</span> is the bond-order potential between atoms <em>i</em> and
<em>j</em>, <span class="math notranslate nohighlight">\(E_{ij}^{Coul}\)</span> is the Coulomb interactions,
<span class="math notranslate nohighlight">\(E^{polar}\)</span> is the polarization term for organic systems (style
<em>comb3</em> only), <span class="math notranslate nohighlight">\(E^{vdW}\)</span> is the van der Waals energy (style
<em>comb3</em> only), <span class="math notranslate nohighlight">\(E^{barr}\)</span> is a charge barrier function, and
<span class="math notranslate nohighlight">\(E^{corr}\)</span> are angular correction terms.</p>
<p>The COMB potentials (styles <em>comb</em> and <em>comb3</em>) are variable charge
potentials. The equilibrium charge on each atom is calculated by the
electronegativity equalization (QEq) method. See <a class="reference internal" href="#rick2"><span class="std std-ref">Rick</span></a> for
further details. This is implemented by the <a class="reference internal" href="fix_qeq_comb.html"><span class="doc">fix qeq/comb</span></a> command, which should normally be
specified in the input script when running a model with the COMB
potential. The <a class="reference internal" href="fix_qeq_comb.html"><span class="doc">fix qeq/comb</span></a> command has options
that determine how often charge equilibration is performed, its
convergence criterion, and which atoms are included in the
calculation.</p>
<p>Only a single pair_coeff command is used with the <em>comb</em> and <em>comb3</em>
styles which specifies the COMB potential file with parameters for all
needed elements. These are mapped to LAMMPS atom types by specifying
N additional arguments after the potential file in the pair_coeff
command, where N is the number of LAMMPS atom types.</p>
<p>For example, if your LAMMPS simulation of a Si/SiO2/
HfO2 interface has 4 atom types, and you want the first and
last to be Si, the second to be Hf, and the third to be O, and you would
use the following pair_coeff command:</p>
<div class="highlight-LAMMPS notranslate"><div class="highlight"><pre><span></span><span class="k">pair_coeff</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">..</span><span class="o">/</span><span class="n">potentials</span><span class="o">/</span><span class="n">ffield.comb</span><span class="w"> </span><span class="n">Si</span><span class="w"> </span><span class="n">Hf</span><span class="w"> </span><span class="n">O</span><span class="w"> </span><span class="n">Si</span>
</pre></div>
</div>
<p>The first two arguments must be * * so as to span all LAMMPS atom
types. The first and last Si arguments map LAMMPS atom types 1 and 4
to the Si element in the <em>ffield.comb</em> file. The second Hf argument
maps LAMMPS atom type 2 to the Hf element, and the third O argument
maps LAMMPS atom type 3 to the O element in the potential file. If a
mapping value is specified as NULL, the mapping is not performed.
This can be used when a <em>comb</em> potential is used as part of the
<em>hybrid</em> pair style. The NULL values are placeholders for atom types
that will be used with other potentials.</p>
<p>For style <em>comb</em>, the provided potential file <em>ffield.comb</em> contains
all currently-available second generation COMB parameterizations: for Si,
Cu, Hf, Ti, O, their oxides and Zr, Zn and U metals. For style
<em>comb3</em>, the potential file <em>ffield.comb3</em> contains all
currently-available third generation COMB parameterizations: O, Cu, N, C,
H, Ti, Zn and Zr. The status of the optimization of the compounds, for
example Cu2O, TiN and hydrocarbons, are given in the
following table:</p>
<table class="docutils align-default">
<tbody>
<tr class="row-odd"><td></td>
<td><p>O</p></td>
<td><p>Cu</p></td>
<td><p>N</p></td>
<td><p>C</p></td>
<td><p>H</p></td>
<td><p>Ti</p></td>
<td><p>Zn</p></td>
<td><p>Zr</p></td>
</tr>
<tr class="row-even"><td><p>O</p></td>
<td><p>F</p></td>
<td><p>F</p></td>
<td><p>F</p></td>
<td><p>F</p></td>
<td><p>F</p></td>
<td><p>F</p></td>
<td><p>F</p></td>
<td><p>F</p></td>
</tr>
<tr class="row-odd"><td><p>Cu</p></td>
<td><p>F</p></td>
<td><p>F</p></td>
<td><p>P</p></td>
<td><p>F</p></td>
<td><p>F</p></td>
<td><p>P</p></td>
<td><p>F</p></td>
<td><p>P</p></td>
</tr>
<tr class="row-even"><td><p>N</p></td>
<td><p>F</p></td>
<td><p>P</p></td>
<td><p>F</p></td>
<td><p>M</p></td>
<td><p>F</p></td>
<td><p>P</p></td>
<td><p>P</p></td>
<td><p>P</p></td>
</tr>
<tr class="row-odd"><td><p>C</p></td>
<td><p>F</p></td>
<td><p>F</p></td>
<td><p>M</p></td>
<td><p>F</p></td>
<td><p>F</p></td>
<td><p>M</p></td>
<td><p>M</p></td>
<td><p>M</p></td>
</tr>
<tr class="row-even"><td><p>H</p></td>
<td><p>F</p></td>
<td><p>F</p></td>
<td><p>F</p></td>
<td><p>F</p></td>
<td><p>F</p></td>
<td><p>M</p></td>
<td><p>M</p></td>
<td><p>F</p></td>
</tr>
<tr class="row-odd"><td><p>Ti</p></td>
<td><p>F</p></td>
<td><p>P</p></td>
<td><p>P</p></td>
<td><p>M</p></td>
<td><p>M</p></td>
<td><p>F</p></td>
<td><p>P</p></td>
<td><p>P</p></td>
</tr>
<tr class="row-even"><td><p>Zn</p></td>
<td><p>F</p></td>
<td><p>F</p></td>
<td><p>P</p></td>
<td><p>M</p></td>
<td><p>M</p></td>
<td><p>P</p></td>
<td><p>F</p></td>
<td><p>P</p></td>
</tr>
<tr class="row-odd"><td><p>Zr</p></td>
<td><p>F</p></td>
<td><p>P</p></td>
<td><p>P</p></td>
<td><p>M</p></td>
<td><p>F</p></td>
<td><p>P</p></td>
<td><p>P</p></td>
<td><p>F</p></td>
</tr>
</tbody>
</table>
<ul class="simple">
<li><p>F = Fully optimized</p></li>
<li><p>M = Only optimized for dimer molecule</p></li>
<li><p>P = in progress, but have it from mixing rule</p></li>
</ul>
<p>For style <em>comb3</em>, in addition to ffield.comb3, a special parameter
file, <em>lib.comb3</em>, that is exclusively used for C/O/H systems, will be
automatically loaded if carbon atom is detected in LAMMPS input
structure. This file must be in your working directory or in the
directories listed in the environment variable <code class="docutils literal notranslate"><span class="pre">LAMMPS_POTENTIALS</span></code>, as
described on the <a class="reference internal" href="pair_coeff.html"><span class="doc">pair_coeff</span></a> command doc page.</p>
<p>The keyword <em>polar</em> indicates whether the force field includes
the atomic polarization. Since the equilibration of the polarization
has not yet been implemented, it can only set polar_off at present.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>You can not use potential file <em>ffield.comb</em> with style <em>comb3</em>,
nor file <em>ffield.comb3</em> with style <em>comb</em>.</p>
</div>
<hr class="docutils" />
<p>Styles with a <em>gpu</em>, <em>intel</em>, <em>kk</em>, <em>omp</em>, or <em>opt</em> suffix are
functionally the same as the corresponding style without the suffix.
They have been optimized to run faster, depending on your available
hardware, as discussed on the <a class="reference internal" href="Speed_packages.html"><span class="doc">Accelerator packages</span></a>
page. The accelerated styles take the same arguments and should
produce the same results, except for round-off and precision issues.</p>
<p>These accelerated styles are part of the GPU, INTEL, KOKKOS,
OPENMP, and OPT packages, respectively. They are only enabled if
LAMMPS was built with those packages. See the <a class="reference internal" href="Build_package.html"><span class="doc">Build package</span></a> page for more info.</p>
<p>You can specify the accelerated styles explicitly in your input script
by including their suffix, or you can use the <a class="reference internal" href="Run_options.html"><span class="doc">-suffix command-line switch</span></a> when you invoke LAMMPS, or you can use the
<a class="reference internal" href="suffix.html"><span class="doc">suffix</span></a> command in your input script.</p>
<p>See the <a class="reference internal" href="Speed_packages.html"><span class="doc">Accelerator packages</span></a> page for more
instructions on how to use the accelerated styles effectively.</p>
</section>
<hr class="docutils" />
<section id="mixing-shift-table-tail-correction-restart-rrespa-info">
<h2>Mixing, shift, table, tail correction, restart, rRESPA info<a class="headerlink" href="#mixing-shift-table-tail-correction-restart-rrespa-info" title="Link to this heading"></a></h2>
<p>For atom type pairs I,J and I != J, where types I and J correspond to
two different element types, mixing is performed by LAMMPS as
described above from values in the potential file.</p>
<p>These pair styles does not support the <a class="reference internal" href="pair_modify.html"><span class="doc">pair_modify</span></a>
shift, table, and tail options.</p>
<p>These pair styles do not write its information to <a class="reference internal" href="restart.html"><span class="doc">binary restart files</span></a>, since it is stored in potential files. Thus, you
need to re-specify the pair_style, pair_coeff, and <a class="reference internal" href="fix_qeq_comb.html"><span class="doc">fix qeq/comb</span></a> commands in an input script that reads a
restart file.</p>
<p>These pair styles can only be used via the <em>pair</em> keyword of the
<a class="reference internal" href="run_style.html"><span class="doc">run_style respa</span></a> command. It does not support the
<em>inner</em>, <em>middle</em>, <em>outer</em> keywords.</p>
</section>
<hr class="docutils" />
<section id="restrictions">
<h2>Restrictions<a class="headerlink" href="#restrictions" title="Link to this heading"></a></h2>
<p>These pair styles are part of the MANYBODY package. It is only
enabled if LAMMPS was built with that package. See the <a class="reference internal" href="Build_package.html"><span class="doc">Build package</span></a> page for more info.</p>
<p>These pair styles requires the <a class="reference internal" href="newton.html"><span class="doc">newton</span></a> setting to be “on”
for pair interactions.</p>
<p>The COMB potentials in the <em>ffield.comb</em> and <em>ffield.comb3</em> files provided
with LAMMPS (see the potentials directory) are parameterized for metal
<a class="reference internal" href="units.html"><span class="doc">units</span></a>. You can use the COMB potential with any LAMMPS
units, but you would need to create your own COMB potential file with
coefficients listed in the appropriate units if your simulation
does not use “metal” units.</p>
</section>
<section id="related-commands">
<h2>Related commands<a class="headerlink" href="#related-commands" title="Link to this heading"></a></h2>
<p><a class="reference internal" href="pair_style.html"><span class="doc">pair_style</span></a>, <a class="reference internal" href="pair_coeff.html"><span class="doc">pair_coeff</span></a>,
<a class="reference internal" href="fix_qeq_comb.html"><span class="doc">fix qeq/comb</span></a></p>
</section>
<section id="default">
<h2>Default<a class="headerlink" href="#default" title="Link to this heading"></a></h2>
<p>none</p>
<hr class="docutils" />
<p id="comb"><strong>(COMB)</strong> T.-R. Shan, B. D. Devine, T. W. Kemper, S. B. Sinnott, and
S. R. Phillpot, Phys. Rev. B 81, 125328 (2010)</p>
<p id="comb3"><strong>(COMB3)</strong> T. Liang, T.-R. Shan, Y.-T. Cheng, B. D. Devine, M. Noordhoek,
Y. Li, Z. Lu, S. R. Phillpot, and S. B. Sinnott, Mat. Sci. &amp; Eng: R 74,
255-279 (2013).</p>
<p id="rick2"><strong>(Rick)</strong> S. W. Rick, S. J. Stuart, B. J. Berne, J Chem Phys 101, 6141
(1994).</p>
</section>
</section>
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