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<p>Just like in <aclass="reference internal" href="lennard-jones-fluid.html#lennard-jones-label"><spanclass="std std-ref">Lennard-Jones fluid</span></a>,
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the pair style is <em>lj/cut</em> (i.e. a Lennard-Jones potential
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with a short-range cutoff) with
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parameter 14, which means that only the atoms closer than 14
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Ångstroms from each other interact through a Lennard-Jones
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with a short-range cutoff) with parameter 14, which means that only the atoms
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closer than 14 Ångstroms from each other interact through a Lennard-Jones
@@ -684,12 +679,10 @@ <h3>The molecular dynamics<a class="headerlink" href="#the-molecular-dynamics" t
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nor rotational momentum, <em>rot yes</em>.</p>
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</div>
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<divclass="justify docutils container">
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<p>The <em>fix nve</em> is applied to all atoms so that all
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atom positions are recalculated at every step, and
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a <em>Berendsen</em> thermostat is applied to the atoms
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of the group <em>carbon_mid</em> only <spanid="id5">[<aclass="reference internal" href="../../non-tutorials/bibliography.html#id50" title="Herman JC Berendsen, JPM Postma, Wilfred F van Gunsteren, ARHJ DiNola, and Jan R Haak. Molecular dynamics with coupling to an external bath. The Journal of chemical physics, 81(8):3684–3690, 1984.">22</a>]</span>.
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The <em>fix_modify myber</em> ensures that the
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<em>fix Berendsen</em> uses the temperature of the group <em>carbon_mid</em> as an
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<p>The <em>fix nve</em> is applied to all atoms so that all atom positions are
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recalculated at every step, and a <em>Berendsen</em> thermostat is applied to the atoms
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of the group <em>carbon_mid</em> only <spanid="id5">[<aclass="reference internal" href="../../non-tutorials/bibliography.html#id50" title="Herman JC Berendsen, JPM Postma, Wilfred F van Gunsteren, ARHJ DiNola, and Jan R Haak. Molecular dynamics with coupling to an external bath. The Journal of chemical physics, 81(8):3684–3690, 1984.">22</a>]</span>. The <em>fix_modify myber</em>
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ensures that the <em>fix Berendsen</em> uses the temperature of the group <em>carbon_mid</em> as an
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input, instead of the temperature of the whole system. This is necessary
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to make sure that the frozen edges won’t bias the temperature. Note that the atoms
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of the edges do not need a thermostat because their motion will
@@ -1029,9 +1022,8 @@ <h3>Start the simulation<a class="headerlink" href="#start-the-simulation" title
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</pre></div>
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</div>
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<divclass="justify docutils container">
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<p>Note the relatively small timestep of <spanclass="math notranslate nohighlight">\(0.0005\,\text{ps}\)</span>
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used. A reactive force field usually requires a smaller timestep
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than a classical one.
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<p>Note the relatively small timestep of <spanclass="math notranslate nohighlight">\(0.0005\,\text{ps}\)</span> used. A
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reactive force field usually requires a smaller timestep than a classical one.
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When running <em>input.lammps</em> with LAMMPS, you can see that the
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temperature deviates from the target temperature of <spanclass="math notranslate nohighlight">\(300\,\text{K}\)</span>
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