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<H1></H1><div class="section" id="lammps-documentation">
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<H1></H1><div class="section" id="lammps-documentation">
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<h1>LAMMPS Documentation<a class="headerlink" href="#lammps-documentation" title="Permalink to this headline">¶</a></h1>
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<h1>LAMMPS Documentation<a class="headerlink" href="#lammps-documentation" title="Permalink to this headline">¶</a></h1>
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<div class="section" id="dec-2015-version">
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<div class="section" id="dec-2015-version">
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<h2>19 Dec 2015 version<a class="headerlink" href="#dec-2015-version" title="Permalink to this headline">¶</a></h2>
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<h2>23 Dec 2015 version<a class="headerlink" href="#dec-2015-version" title="Permalink to this headline">¶</a></h2>
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</div>
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</div>
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<div class="section" id="version-info">
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<div class="section" id="version-info">
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<h2>Version info:<a class="headerlink" href="#version-info" title="Permalink to this headline">¶</a></h2>
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<h2>Version info:<a class="headerlink" href="#version-info" title="Permalink to this headline">¶</a></h2>
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@ -1,7 +1,7 @@
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<!-- HTML_ONLY -->
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<!-- HTML_ONLY -->
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<HEAD>
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<HEAD>
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<TITLE>LAMMPS Users Manual</TITLE>
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<TITLE>LAMMPS Users Manual</TITLE>
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<META NAME="docnumber" CONTENT="19 Dec 2015 version">
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<META NAME="docnumber" CONTENT="23 Dec 2015 version">
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<META NAME="author" CONTENT="http://lammps.sandia.gov - Sandia National Laboratories">
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<META NAME="author" CONTENT="http://lammps.sandia.gov - Sandia National Laboratories">
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<META NAME="copyright" CONTENT="Copyright (2003) Sandia Corporation. This software and manual is distributed under the GNU General Public License.">
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<META NAME="copyright" CONTENT="Copyright (2003) Sandia Corporation. This software and manual is distributed under the GNU General Public License.">
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</HEAD>
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</HEAD>
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@ -21,7 +21,7 @@
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<H1></H1>
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<H1></H1>
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LAMMPS Documentation :c,h3
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LAMMPS Documentation :c,h3
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19 Dec 2015 version :c,h4
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23 Dec 2015 version :c,h4
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Version info: :h4
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Version info: :h4
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@ -235,12 +235,12 @@ correctly, the time-averaged temperature and stress tensor of the
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particles will match the target values specified by Tstart/Tstop and
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particles will match the target values specified by Tstart/Tstop and
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Pstart/Pstop.</p>
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Pstart/Pstop.</p>
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<p>The equations of motion used are those of Shinoda et al in
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<p>The equations of motion used are those of Shinoda et al in
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<a class="reference internal" href="#shinoda"><span>(Shinoda)</span></a>, which combine the hydrostatic equations of
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<a class="reference internal" href="pair_sdk.html#shinoda"><span>(Shinoda)</span></a>, which combine the hydrostatic equations of
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Martyna, Tobias and Klein in <a class="reference internal" href="#martyna"><span>(Martyna)</span></a> with the strain
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Martyna, Tobias and Klein in <a class="reference internal" href="fix_rigid.html#martyna"><span>(Martyna)</span></a> with the strain
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energy proposed by Parrinello and Rahman in
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energy proposed by Parrinello and Rahman in
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<a class="reference internal" href="#parrinello"><span>(Parrinello)</span></a>. The time integration schemes closely
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<a class="reference internal" href="fix_nh_eff.html#parrinello"><span>(Parrinello)</span></a>. The time integration schemes closely
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follow the time-reversible measure-preserving Verlet and rRESPA
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follow the time-reversible measure-preserving Verlet and rRESPA
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integrators derived by Tuckerman et al in <a class="reference internal" href="#tuckerman"><span>(Tuckerman)</span></a>.</p>
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integrators derived by Tuckerman et al in <a class="reference internal" href="run_style.html#tuckerman"><span>(Tuckerman)</span></a>.</p>
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<hr class="docutils" />
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<hr class="docutils" />
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<p>The thermostat parameters for fix styles <em>nvt</em> and <em>npt</em> is specified
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<p>The thermostat parameters for fix styles <em>nvt</em> and <em>npt</em> is specified
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using the <em>temp</em> keyword. Other thermostat-related keywords are
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using the <em>temp</em> keyword. Other thermostat-related keywords are
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@ -397,7 +397,7 @@ freedom. A value of 0 corresponds to no thermostatting of the
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barostat variables.</p>
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barostat variables.</p>
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<p>The <em>mtk</em> keyword controls whether or not the correction terms due to
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<p>The <em>mtk</em> keyword controls whether or not the correction terms due to
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Martyna, Tuckerman, and Klein are included in the equations of motion
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Martyna, Tuckerman, and Klein are included in the equations of motion
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<a class="reference internal" href="#martyna"><span>(Martyna)</span></a>. Specifying <em>no</em> reproduces the original
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<a class="reference internal" href="fix_rigid.html#martyna"><span>(Martyna)</span></a>. Specifying <em>no</em> reproduces the original
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Hoover barostat, whose volume probability distribution function
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Hoover barostat, whose volume probability distribution function
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differs from the true NPT and NPH ensembles by a factor of 1/V. Hence
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differs from the true NPT and NPH ensembles by a factor of 1/V. Hence
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using <em>yes</em> is more correct, but in many cases the difference is
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using <em>yes</em> is more correct, but in many cases the difference is
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@ -406,7 +406,7 @@ negligible.</p>
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scheme at little extra cost. The initial and final updates of the
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scheme at little extra cost. The initial and final updates of the
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thermostat variables are broken up into <em>tloop</em> substeps, each of
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thermostat variables are broken up into <em>tloop</em> substeps, each of
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length <em>dt</em>/<em>tloop</em>. This corresponds to using a first-order
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length <em>dt</em>/<em>tloop</em>. This corresponds to using a first-order
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Suzuki-Yoshida scheme <a class="reference internal" href="#tuckerman"><span>(Tuckerman)</span></a>. The keyword <em>ploop</em>
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Suzuki-Yoshida scheme <a class="reference internal" href="run_style.html#tuckerman"><span>(Tuckerman)</span></a>. The keyword <em>ploop</em>
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does the same thing for the barostat thermostat.</p>
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does the same thing for the barostat thermostat.</p>
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<p>The keyword <em>nreset</em> controls how often the reference dimensions used
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<p>The keyword <em>nreset</em> controls how often the reference dimensions used
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to define the strain energy are reset. If this keyword is not used,
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to define the strain energy are reset. If this keyword is not used,
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@ -172,8 +172,8 @@ fix 1 all qeq/fire 1 10 1.0e-3 100 my_qeq qdamp 0.2 qstep 0.1
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</div>
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</div>
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<div class="section" id="description">
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<div class="section" id="description">
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<h2>Description<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
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<h2>Description<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
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<p>Perform the charge equilibration (QEq) method as described in <a class="reference internal" href="#rappe"><span>(Rappe and Goddard)</span></a> and formulated in <a class="reference internal" href="#nakano"><span>(Nakano)</span></a> (also known
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<p>Perform the charge equilibration (QEq) method as described in <a class="reference internal" href="fix_qeq_reax.html#rappe"><span>(Rappe and Goddard)</span></a> and formulated in <a class="reference internal" href="neb.html#nakano"><span>(Nakano)</span></a> (also known
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as the matrix inversion method) and in <a class="reference internal" href="#rick"><span>(Rick and Stuart)</span></a> (also
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as the matrix inversion method) and in <a class="reference internal" href="pair_smtbq.html#rick"><span>(Rick and Stuart)</span></a> (also
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known as the extended Lagrangian method) based on the
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known as the extended Lagrangian method) based on the
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electronegativity equilization principle.</p>
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electronegativity equilization principle.</p>
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<p>These fixes can be used with any <a class="reference internal" href="pair_style.html"><em>pair style</em></a> in
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<p>These fixes can be used with any <a class="reference internal" href="pair_style.html"><em>pair style</em></a> in
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<li><em>chi</em> = electronegativity in energy units</li>
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<li><em>chi</em> = electronegativity in energy units</li>
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<li><em>eta</em> = self-Coulomb potential in energy units</li>
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<li><em>eta</em> = self-Coulomb potential in energy units</li>
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<li><em>gamma</em> = shielded Coulomb constant defined by <a class="reference internal" href="#vanduin"><span>ReaxFF force field</span></a> in distance units</li>
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<li><em>gamma</em> = shielded Coulomb constant defined by <a class="reference internal" href="#vanduin"><span>ReaxFF force field</span></a> in distance units</li>
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<li><em>zeta</em> = Slater type orbital exponent defined by the <a class="reference internal" href="#streitz"><span>Streitz-Mintmire</span></a> potential in reverse distance units</li>
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<li><em>zeta</em> = Slater type orbital exponent defined by the <a class="reference internal" href="pair_coul.html#streitz"><span>Streitz-Mintmire</span></a> potential in reverse distance units</li>
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<li><em>qcore</em> = charge of the nucleus defined by the <a class="reference internal" href="#streitz"><span>Streitz-Mintmire potential</span></a> potential in charge units</li>
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<li><em>qcore</em> = charge of the nucleus defined by the <a class="reference internal" href="pair_coul.html#streitz"><span>Streitz-Mintmire potential</span></a> potential in charge units</li>
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</ul>
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</ul>
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<p>The <em>qeq/point</em> style describes partial charges on atoms as point
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<p>The <em>qeq/point</em> style describes partial charges on atoms as point
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charges. Interaction between a pair of charged particles is 1/r,
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charges. Interaction between a pair of charged particles is 1/r,
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that the interaction between a pair of charged particles is the
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that the interaction between a pair of charged particles is the
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product of two Slater 1*s* orbitals. The expression for the Slater
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product of two Slater 1*s* orbitals. The expression for the Slater
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1*s* orbital is given under equation (6) of the
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1*s* orbital is given under equation (6) of the
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<a class="reference internal" href="#streitz"><span>Streitz-Mintmire</span></a> paper. Only the <em>chi</em>, <em>eta</em>, <em>zeta</em>, and
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<a class="reference internal" href="pair_coul.html#streitz"><span>Streitz-Mintmire</span></a> paper. Only the <em>chi</em>, <em>eta</em>, <em>zeta</em>, and
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<em>qcore</em> parameters from the <em>qfile</em> file are used. This style solves
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<em>qcore</em> parameters from the <em>qfile</em> file are used. This style solves
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partial charges on atoms via the matrix inversion method. A tolerance
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partial charges on atoms via the matrix inversion method. A tolerance
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of 1.0e-6 is usually a good number. Keyword <em>alpha</em> can be used to
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of 1.0e-6 is usually a good number. Keyword <em>alpha</em> can be used to
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