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Force field (chemistry) - Wikipedia
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vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Force_fields_for_crystal_systems"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Force fields for crystal systems</span> </div> </a> <ul id="toc-Force_fields_for_crystal_systems-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Parameterization" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Parameterization"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Parameterization</span> </div> </a> <ul id="toc-Parameterization-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Force_field_databases" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Force_field_databases"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Force field databases</span> </div> </a> <ul id="toc-Force_field_databases-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Transferability_and_mixing_function_types" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Transferability_and_mixing_function_types"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Transferability and mixing function types</span> </div> </a> <ul id="toc-Transferability_and_mixing_function_types-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Limitations" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Limitations"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>Limitations</span> </div> </a> <ul id="toc-Limitations-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Force_fields_available_in_literature" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Force_fields_available_in_literature"> <div class="vector-toc-text"> <span class="vector-toc-numb">7</span> <span>Force fields available in literature</span> </div> </a> <button aria-controls="toc-Force_fields_available_in_literature-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Force fields available in literature subsection</span> </button> <ul id="toc-Force_fields_available_in_literature-sublist" class="vector-toc-list"> <li id="toc-Classical" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Classical"> <div class="vector-toc-text"> <span class="vector-toc-numb">7.1</span> <span>Classical</span> </div> </a> <ul id="toc-Classical-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Polarizable" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Polarizable"> <div class="vector-toc-text"> <span class="vector-toc-numb">7.2</span> <span>Polarizable</span> </div> </a> <ul id="toc-Polarizable-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Reactive" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Reactive"> <div class="vector-toc-text"> <span class="vector-toc-numb">7.3</span> <span>Reactive</span> </div> </a> <ul id="toc-Reactive-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Coarse-grained" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Coarse-grained"> <div class="vector-toc-text"> <span class="vector-toc-numb">7.4</span> <span>Coarse-grained</span> </div> </a> <ul id="toc-Coarse-grained-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Machine_learning" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Machine_learning"> <div class="vector-toc-text"> <span class="vector-toc-numb">7.5</span> <span>Machine learning</span> </div> </a> <ul id="toc-Machine_learning-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Water" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Water"> <div class="vector-toc-text"> <span class="vector-toc-numb">7.6</span> <span>Water</span> </div> </a> <ul id="toc-Water-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Modified_amino_acids" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Modified_amino_acids"> <div class="vector-toc-text"> <span class="vector-toc-numb">7.7</span> <span>Modified amino acids</span> </div> </a> <ul id="toc-Modified_amino_acids-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Other" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Other"> <div class="vector-toc-text"> <span class="vector-toc-numb">7.8</span> <span>Other</span> </div> </a> <ul id="toc-Other-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-See_also" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#See_also"> <div class="vector-toc-text"> <span class="vector-toc-numb">8</span> <span>See also</span> </div> </a> <ul id="toc-See_also-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-References" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#References"> <div class="vector-toc-text"> <span class="vector-toc-numb">9</span> <span>References</span> </div> </a> <ul id="toc-References-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Further_reading" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Further_reading"> <div class="vector-toc-text"> <span class="vector-toc-numb">10</span> <span>Further reading</span> </div> </a> <ul id="toc-Further_reading-sublist" class="vector-toc-list"> </ul> </li> </ul> 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href="https://de.wikipedia.org/wiki/Kraftfeld_(Computerphysik)" title="Kraftfeld (Computerphysik) – German" lang="de" hreflang="de" data-title="Kraftfeld (Computerphysik)" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Campo_de_fuerza_(qu%C3%ADmica)" title="Campo de fuerza (química) – Spanish" lang="es" hreflang="es" data-title="Campo de fuerza (química)" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D9%85%DB%8C%D8%AF%D8%A7%D9%86%E2%80%8C%D9%87%D8%A7%DB%8C_%D9%86%DB%8C%D8%B1%D9%88%DB%8C_%D8%A8%D8%B1%D9%87%D9%85%DA%A9%D9%86%D8%B4%DB%8C_(%D8%B4%DB%8C%D9%85%DB%8C)" title="میدانهای نیروی برهمکنشی (شیمی) – Persian" lang="fa" hreflang="fa" data-title="میدانهای نیروی برهمکنشی (شیمی)" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Champ_de_force_(chimie)" title="Champ de force (chimie) – French" lang="fr" hreflang="fr" data-title="Champ de force (chimie)" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Force_field" title="Force field – Italian" lang="it" hreflang="it" data-title="Force field" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-mn mw-list-item"><a href="https://mn.wikipedia.org/wiki/%D0%A5%D2%AF%D1%87%D0%BD%D0%B8%D0%B9_%D0%BE%D1%80%D0%BE%D0%BD" title="Хүчний орон – Mongolian" lang="mn" hreflang="mn" data-title="Хүчний орон" data-language-autonym="Монгол" data-language-local-name="Mongolian" class="interlanguage-link-target"><span>Монгол</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Krachtveld_(scheikunde)" title="Krachtveld (scheikunde) – Dutch" lang="nl" hreflang="nl" data-title="Krachtveld (scheikunde)" data-language-autonym="Nederlands" data-language-local-name="Dutch" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E5%8A%9B%E5%A0%B4_(%E5%8C%96%E5%AD%A6)" title="力場 (化学) – Japanese" lang="ja" hreflang="ja" data-title="力場 (化学)" data-language-autonym="日本語" data-language-local-name="Japanese" 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.ambox{display:none!important}}</style><table class="box-Cleanup plainlinks metadata ambox ambox-style ambox-Cleanup" role="presentation"><tbody><tr><td class="mbox-image"><div class="mbox-image-div"><span typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/f/f2/Edit-clear.svg/40px-Edit-clear.svg.png" decoding="async" width="40" height="40" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/f/f2/Edit-clear.svg/60px-Edit-clear.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/f/f2/Edit-clear.svg/80px-Edit-clear.svg.png 2x" data-file-width="48" data-file-height="48" /></span></span></div></td><td class="mbox-text"><div class="mbox-text-span">This article may <b>require <a href="/wiki/Wikipedia:Cleanup" title="Wikipedia:Cleanup">cleanup</a></b> to meet Wikipedia's <a href="/wiki/Wikipedia:Manual_of_Style" title="Wikipedia:Manual of Style">quality standards</a>. The specific problem is: <b>Grammar issues.</b><span class="hide-when-compact"> Please help <a href="/wiki/Special:EditPage/Force_field_(chemistry)" title="Special:EditPage/Force field (chemistry)">improve this article</a> if you can.</span> <span class="date-container"><i>(<span class="date">January 2024</span>)</i></span><span class="hide-when-compact"><i> (<small><a href="/wiki/Help:Maintenance_template_removal" title="Help:Maintenance template removal">Learn how and when to remove this message</a></small>)</i></span></div></td></tr></tbody></table> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Bond_stretching_energy.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Bond_stretching_energy.png/220px-Bond_stretching_energy.png" decoding="async" width="220" height="286" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/6/63/Bond_stretching_energy.png 1.5x" data-file-width="323" data-file-height="420" /></a><figcaption>Part of force field of ethane for the C-C stretching bond.</figcaption></figure> <p>In the context of <a href="/wiki/Chemistry" title="Chemistry">chemistry</a>, <a href="/wiki/Molecular_physics" title="Molecular physics">molecular physics</a>, <a href="/wiki/Physical_chemistry" title="Physical chemistry">physical chemistry</a>, and <a href="/wiki/Molecular_modelling" title="Molecular modelling">molecular modelling</a>, a <b>force field</b> is a <a href="/wiki/Computational_chemistry" title="Computational chemistry">computational</a> model that is used to describe the forces between atoms (or collections of atoms) within molecules or between molecules as well as in crystals. Force fields are a variety of <a href="/wiki/Interatomic_potential" title="Interatomic potential">interatomic potentials</a>. More precisely, the force field refers to the <a href="/wiki/Function_(mathematics)" title="Function (mathematics)">functional form</a> and <a href="/wiki/Parameter" title="Parameter">parameter</a> sets used to calculate the <a href="/wiki/Potential_energy" title="Potential energy">potential energy</a> of a system on the atomistic level. Force fields are usually used in <a href="/wiki/Molecular_dynamics" title="Molecular dynamics">molecular dynamics</a> or <a href="/wiki/Monte_Carlo_method" title="Monte Carlo method">Monte Carlo</a> simulations. The parameters for a chosen energy function may be derived from classical laboratory experiment data, calculations in <a href="/wiki/Quantum_mechanics" title="Quantum mechanics">quantum mechanics</a>, or both. Force fields utilize the same concept as <a href="/wiki/Force_field_(physics)" title="Force field (physics)">force fields</a> in <a href="/wiki/Classical_physics" title="Classical physics">classical physics</a>, with the main difference being that the force field parameters in chemistry describe the energy landscape on the atomistic level. From a force field, the acting forces on every particle are derived as a <a href="/wiki/Gradient" title="Gradient">gradient</a> of the potential energy with respect to the particle coordinates.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </p><p>A large number of different force field types exist today (e.g. for <a href="/wiki/Organic_compound" title="Organic compound">organic molecules</a>, <a href="/wiki/Ion" title="Ion">ions</a>, <a href="/wiki/Polymer" title="Polymer">polymers</a>, <a href="/wiki/Mineral" title="Mineral">minerals</a>, and <a href="/wiki/Metal" title="Metal">metals</a>). Depending on the material, different functional forms are usually chosen for the force fields since different types of atomistic interactions dominate the material behavior. </p><p>There are various criteria that can be used for categorizing force field parametrization strategies. An important differentiation is 'component-specific' and 'transferable'. For a component-specific parametrization, the considered force field is developed solely for describing a single given substance (e.g. water).<sup id="cite_ref-:1_2-0" class="reference"><a href="#cite_note-:1-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> For a transferable force field, all or some parameters are designed as building blocks and become transferable/ applicable for different substances (e.g. <a href="/wiki/Methyl_group" title="Methyl group">methyl groups</a> in alkane transferable force fields).<sup id="cite_ref-:0_3-0" class="reference"><a href="#cite_note-:0-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> A different important differentiation addresses the physical structure of the models: A<i>ll-atom</i> force fields provide parameters for every type of atom in a system, including <a href="/wiki/Hydrogen" title="Hydrogen">hydrogen</a>, while <i>united-atom</i> interatomic potentials treat the hydrogen and <a href="/wiki/Carbon" title="Carbon">carbon</a> atoms in <a href="/wiki/Methyl_group" title="Methyl group">methyl groups</a> and <a href="/wiki/Methylene_bridge" title="Methylene bridge">methylene bridges</a> as one interaction center.<sup id="cite_ref-Leach_2001_4-0" class="reference"><a href="#cite_note-Leach_2001-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-tandfonline.com_5-0" class="reference"><a href="#cite_note-tandfonline.com-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> <i>Coarse-grained</i> potentials, which are often used in long-time simulations of <a href="/wiki/Macromolecule" title="Macromolecule">macromolecules</a> such as <a href="/wiki/Protein" title="Protein">proteins</a>, <a href="/wiki/Nucleic_acid" title="Nucleic acid">nucleic acids</a>, and multi-component complexes, sacrifice chemical details for higher computing efficiency.<sup id="cite_ref-Marrink_2007_6-0" class="reference"><a href="#cite_note-Marrink_2007-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Force_fields_for_molecular_systems">Force fields for molecular systems</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Force_field_(chemistry)&action=edit&section=1" title="Edit section: Force fields for molecular systems"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:MM_PEF.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/5/5c/MM_PEF.png/220px-MM_PEF.png" decoding="async" width="220" height="168" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/5c/MM_PEF.png/330px-MM_PEF.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/5c/MM_PEF.png/440px-MM_PEF.png 2x" data-file-width="2880" data-file-height="2200" /></a><figcaption>Molecular mechanics potential energy function with continuum solvent.</figcaption></figure> <p>The basic functional form of <a href="/wiki/Potential_energy" title="Potential energy">potential energy</a> for modeling molecular systems includes intramolecular interaction terms for interactions of atoms that are linked by <a href="/wiki/Covalent_bond" title="Covalent bond">covalent bonds</a>, and intermolecular (i.e. nonbonded also termed <i>noncovalent</i>) terms that describe the long-range <a href="/wiki/Electrostatic" class="mw-redirect" title="Electrostatic">electrostatic</a> and <a href="/wiki/Van_der_Waals_force" title="Van der Waals force">van der Waals forces</a>. The specific decomposition of the terms depends on the force field, but a general form for the total energy in an additive force field can be written as <span class="mwe-math-element"><span class="mwe-math-mathml-display mwe-math-mathml-a11y" style="display: none;"><math display="block" xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle E_{\text{total}}=E_{\text{bonded}}+E_{\text{nonbonded}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>E</mi> <mrow class="MJX-TeXAtom-ORD"> <mtext>total</mtext> </mrow> </msub> <mo>=</mo> <msub> <mi>E</mi> <mrow class="MJX-TeXAtom-ORD"> <mtext>bonded</mtext> </mrow> </msub> <mo>+</mo> <msub> <mi>E</mi> <mrow class="MJX-TeXAtom-ORD"> <mtext>nonbonded</mtext> </mrow> </msub> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle E_{\text{total}}=E_{\text{bonded}}+E_{\text{nonbonded}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/604d5597535f4f101f6e24130e3f5a1b4cdb874b" class="mwe-math-fallback-image-display mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:28.228ex; height:2.509ex;" alt="{\displaystyle E_{\text{total}}=E_{\text{bonded}}+E_{\text{nonbonded}}}"></span> where the components of the covalent and noncovalent contributions are given by the following summations: <span class="mwe-math-element"><span class="mwe-math-mathml-display mwe-math-mathml-a11y" style="display: none;"><math display="block" xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle E_{\text{bonded}}=E_{\text{bond}}+E_{\text{angle}}+E_{\text{dihedral}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>E</mi> <mrow class="MJX-TeXAtom-ORD"> <mtext>bonded</mtext> </mrow> </msub> <mo>=</mo> <msub> <mi>E</mi> <mrow class="MJX-TeXAtom-ORD"> <mtext>bond</mtext> </mrow> </msub> <mo>+</mo> <msub> <mi>E</mi> <mrow class="MJX-TeXAtom-ORD"> <mtext>angle</mtext> </mrow> </msub> <mo>+</mo> <msub> <mi>E</mi> <mrow class="MJX-TeXAtom-ORD"> <mtext>dihedral</mtext> </mrow> </msub> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle E_{\text{bonded}}=E_{\text{bond}}+E_{\text{angle}}+E_{\text{dihedral}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/25501b32500a8629a6b64f1339b11d1185a02892" class="mwe-math-fallback-image-display mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.005ex; width:34.939ex; height:2.843ex;" alt="{\displaystyle E_{\text{bonded}}=E_{\text{bond}}+E_{\text{angle}}+E_{\text{dihedral}}}"></span> <span class="mwe-math-element"><span class="mwe-math-mathml-display mwe-math-mathml-a11y" style="display: none;"><math display="block" xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle E_{\text{nonbonded}}=E_{\text{electrostatic}}+E_{\text{van der Waals}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>E</mi> <mrow class="MJX-TeXAtom-ORD"> <mtext>nonbonded</mtext> </mrow> </msub> <mo>=</mo> <msub> <mi>E</mi> <mrow class="MJX-TeXAtom-ORD"> <mtext>electrostatic</mtext> </mrow> </msub> <mo>+</mo> <msub> <mi>E</mi> <mrow class="MJX-TeXAtom-ORD"> <mtext>van der Waals</mtext> </mrow> </msub> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle E_{\text{nonbonded}}=E_{\text{electrostatic}}+E_{\text{van der Waals}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/bbe6c2304209b7cb0b9472a0970fe81741c0ff6b" class="mwe-math-fallback-image-display mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:38.821ex; height:2.509ex;" alt="{\displaystyle E_{\text{nonbonded}}=E_{\text{electrostatic}}+E_{\text{van der Waals}}}"></span> </p><p>The bond and angle terms are usually modeled by quadratic energy functions that do not allow bond breaking. A more realistic description of a covalent bond at higher stretching is provided by the more expensive <a href="/wiki/Morse_potential" title="Morse potential">Morse potential</a>. The functional form for dihedral energy is variable from one force field to another. Additionally, "improper torsional" terms may be added to enforce the planarity of <a href="/wiki/Aromatic" class="mw-redirect" title="Aromatic">aromatic</a> rings and other <a href="/wiki/Conjugated_system" title="Conjugated system">conjugated systems</a>, and "cross-terms" that describe the coupling of different internal variables, such as angles and bond lengths. Some force fields also include explicit terms for <a href="/wiki/Hydrogen_bond" title="Hydrogen bond">hydrogen bonds</a>. </p><p>The nonbonded terms are computationally most intensive. A popular choice is to limit interactions to pairwise energies. The van der Waals term is usually computed with a <a href="/wiki/Lennard-Jones_potential" title="Lennard-Jones potential">Lennard-Jones potential</a><sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> or the <a href="/wiki/Mie_potential" title="Mie potential">Mie potential</a><sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> and the electrostatic term with <a href="/wiki/Coulomb%27s_law" title="Coulomb's law">Coulomb's law</a>. However, both can be buffered or scaled by a constant factor to account for electronic <a href="/wiki/Polarizability" title="Polarizability">polarizability</a>. A large number of force fields based on this or similar energy expressions have been proposed in the past decades for modeling different types of materials such as molecular substances, metals, glasses etc. - see below for a comprehensive list of force fields. </p> <div class="mw-heading mw-heading3"><h3 id="Bond_stretching">Bond stretching</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Force_field_(chemistry)&action=edit&section=2" title="Edit section: Bond stretching"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>As it is rare for bonds to deviate significantly from their equilibrium values, the most simplistic approaches utilize a <a href="/wiki/Hooke%27s_law" title="Hooke's law">Hooke's law</a> formula: <span class="mwe-math-element"><span class="mwe-math-mathml-display mwe-math-mathml-a11y" style="display: none;"><math display="block" xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle E_{\text{bond}}={\frac {k_{ij}}{2}}(l_{ij}-l_{0,ij})^{2},}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>E</mi> <mrow class="MJX-TeXAtom-ORD"> <mtext>bond</mtext> </mrow> </msub> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <msub> <mi>k</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>i</mi> <mi>j</mi> </mrow> </msub> <mn>2</mn> </mfrac> </mrow> <mo stretchy="false">(</mo> <msub> <mi>l</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>i</mi> <mi>j</mi> </mrow> </msub> <mo>−<!-- − --></mo> <msub> <mi>l</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> <mo>,</mo> <mi>i</mi> <mi>j</mi> </mrow> </msub> <msup> <mo stretchy="false">)</mo> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msup> <mo>,</mo> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle E_{\text{bond}}={\frac {k_{ij}}{2}}(l_{ij}-l_{0,ij})^{2},}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/e1ff1cb4aea19f5c3be9425d794862a02e65e921" class="mwe-math-fallback-image-display mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.838ex; width:24.105ex; height:5.676ex;" alt="{\displaystyle E_{\text{bond}}={\frac {k_{ij}}{2}}(l_{ij}-l_{0,ij})^{2},}"></span> where <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle k_{ij}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>k</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>i</mi> <mi>j</mi> </mrow> </msub> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle k_{ij}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/9db60ff245b7d793444196f9f8f1c3f990180c7b" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.005ex; width:2.688ex; height:2.843ex;" alt="{\displaystyle k_{ij}}"></span> is the force constant, <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle l_{ij}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>l</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>i</mi> <mi>j</mi> </mrow> </msub> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle l_{ij}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/45d431596818cc830a50eb78ee48d7013f87713a" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.005ex; width:2.17ex; height:2.843ex;" alt="{\displaystyle l_{ij}}"></span> is the bond length, and <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle l_{0,ij}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>l</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> <mo>,</mo> <mi>i</mi> <mi>j</mi> </mrow> </msub> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle l_{0,ij}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/ed2ea961cb4eedbfd2c5341d146549a5e820eaa6" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.005ex; width:3.45ex; height:2.843ex;" alt="{\displaystyle l_{0,ij}}"></span> is the value for the bond length between atoms <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle i}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>i</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle i}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/add78d8608ad86e54951b8c8bd6c8d8416533d20" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:0.802ex; height:2.176ex;" alt="{\displaystyle i}"></span> and <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle j}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>j</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle j}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/2f461e54f5c093e92a55547b9764291390f0b5d0" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; margin-left: -0.027ex; width:0.985ex; height:2.509ex;" alt="{\displaystyle j}"></span> when all other terms in the force field are set to 0. The term <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle l_{0,ij}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>l</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> <mo>,</mo> <mi>i</mi> <mi>j</mi> </mrow> </msub> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle l_{0,ij}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/ed2ea961cb4eedbfd2c5341d146549a5e820eaa6" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.005ex; width:3.45ex; height:2.843ex;" alt="{\displaystyle l_{0,ij}}"></span> is at times differently defined or taken at different thermodynamic conditions. </p><p>The bond stretching constant <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle k_{ij}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>k</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>i</mi> <mi>j</mi> </mrow> </msub> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle k_{ij}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/9db60ff245b7d793444196f9f8f1c3f990180c7b" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.005ex; width:2.688ex; height:2.843ex;" alt="{\displaystyle k_{ij}}"></span> can be determined from the experimental <a href="/wiki/Infrared_spectroscopy" title="Infrared spectroscopy">infrared</a> spectrum, <a href="/wiki/Raman_spectroscopy" title="Raman spectroscopy">Raman</a> spectrum, or high-level <a href="/wiki/Quantum_chemistry" title="Quantum chemistry">quantum-mechanical</a> calculations.<sup id="cite_ref-Leach_2001_4-1" class="reference"><a href="#cite_note-Leach_2001-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> The constant <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle k_{ij}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>k</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>i</mi> <mi>j</mi> </mrow> </msub> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle k_{ij}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/9db60ff245b7d793444196f9f8f1c3f990180c7b" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.005ex; width:2.688ex; height:2.843ex;" alt="{\displaystyle k_{ij}}"></span> determines vibrational frequencies in <a href="/wiki/Molecular_dynamics" title="Molecular dynamics">molecular dynamics</a> simulations. The stronger the bond is between atoms, the higher is the value of the force constant, and the higher the <a href="/wiki/Wavenumber" title="Wavenumber">wavenumber</a> (energy) in the IR/Raman spectrum. </p><p>Though the formula of Hooke's law provides a reasonable level of accuracy at bond lengths near the equilibrium distance, it is less accurate as one moves away. In order to model the Morse curve better, one could employ cubic and higher powers.<sup id="cite_ref-Leach_2001_4-2" class="reference"><a href="#cite_note-Leach_2001-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Sun_1994_9-0" class="reference"><a href="#cite_note-Sun_1994-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> However, for most practical applications these differences are negligible, and inaccuracies in predictions of bond lengths are on the order of the thousandth of an angstrom, which is also the limit of reliability for common force fields. A <a href="/wiki/Morse_potential" title="Morse potential">Morse potential</a> can be employed instead to enable bond breaking and higher accuracy, even though it is less efficient to compute. For reactive force fields, bond breaking and bond orders are additionally considered. </p> <div class="mw-heading mw-heading3"><h3 id="Electrostatic_interactions">Electrostatic interactions</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Force_field_(chemistry)&action=edit&section=3" title="Edit section: Electrostatic interactions"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Electrostatic interactions are represented by a Coulomb energy, which utilizes <a href="/wiki/Partial_charge" title="Partial charge">atomic charges</a> <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle q_{i}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>q</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>i</mi> </mrow> </msub> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle q_{i}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/2752dcbff884354069fe332b8e51eb0a70a531b6" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:1.837ex; height:2.009ex;" alt="{\displaystyle q_{i}}"></span> to represent chemical bonding ranging from <a href="/wiki/Covalent_bond" title="Covalent bond">covalent</a> to <a href="/wiki/Chemical_polarity" title="Chemical polarity">polar covalent</a> and <a href="/wiki/Ionic_bonding" title="Ionic bonding">ionic bonding</a>. The typical formula is the <a href="/wiki/Coulomb%27s_law" title="Coulomb's law">Coulomb law</a>: <span class="mwe-math-element"><span class="mwe-math-mathml-display mwe-math-mathml-a11y" style="display: none;"><math display="block" xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle E_{\text{Coulomb}}={\frac {1}{4\pi \varepsilon _{0}}}{\frac {q_{i}q_{j}}{r_{ij}}},}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>E</mi> <mrow class="MJX-TeXAtom-ORD"> <mtext>Coulomb</mtext> </mrow> </msub> <mo>=</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mn>1</mn> <mrow> <mn>4</mn> <mi>π<!-- π --></mi> <msub> <mi>ε<!-- ε --></mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> </mrow> </mfrac> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mrow> <msub> <mi>q</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>i</mi> </mrow> </msub> <msub> <mi>q</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>j</mi> </mrow> </msub> </mrow> <msub> <mi>r</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>i</mi> <mi>j</mi> </mrow> </msub> </mfrac> </mrow> <mo>,</mo> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle E_{\text{Coulomb}}={\frac {1}{4\pi \varepsilon _{0}}}{\frac {q_{i}q_{j}}{r_{ij}}},}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/ac89b8faee91daf3efde1bea8a7d722a4e4290bc" class="mwe-math-fallback-image-display mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.505ex; width:22.265ex; height:5.843ex;" alt="{\displaystyle E_{\text{Coulomb}}={\frac {1}{4\pi \varepsilon _{0}}}{\frac {q_{i}q_{j}}{r_{ij}}},}"></span> where <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle r_{ij}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>r</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>i</mi> <mi>j</mi> </mrow> </msub> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle r_{ij}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/857845aef8b93395ad10279211c6c49180bb8791" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.005ex; width:2.526ex; height:2.343ex;" alt="{\displaystyle r_{ij}}"></span> is the distance between two atoms <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle i}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>i</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle i}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/add78d8608ad86e54951b8c8bd6c8d8416533d20" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:0.802ex; height:2.176ex;" alt="{\displaystyle i}"></span> and <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle j}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>j</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle j}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/2f461e54f5c093e92a55547b9764291390f0b5d0" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; margin-left: -0.027ex; width:0.985ex; height:2.509ex;" alt="{\displaystyle j}"></span>. The total Coulomb energy is a sum over all pairwise combinations of atoms and usually excludes <span class="clarify-content" style="padding-left:0.1em; padding-right:0.1em; color:var(--color-subtle, #54595d); border:1px solid var(--border-color-subtle, #c8ccd1);">1, 2 bonded atoms, 1, 3 bonded atoms, as well as 1, 4 bonded atoms</span><sup class="noprint Inline-Template Template-Clarify" style="margin-left:0.1em; white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Please_clarify" title="Wikipedia:Please clarify"><span title="This passage needs to be better explained. (May 2024)">clarify</span></a></i>]</sup>.<sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Mishra_2014_12-0" class="reference"><a href="#cite_note-Mishra_2014-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> </p><p>Atomic charges can make dominant contributions to the potential energy, especially for polar molecules and ionic compounds, and are critical to simulate the geometry, interaction energy, and the reactivity. The assignment of charges usually uses some heuristic approach, with different possible solutions. </p> <div class="mw-heading mw-heading2"><h2 id="Force_fields_for_crystal_systems">Force fields for crystal systems</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Force_field_(chemistry)&action=edit&section=4" title="Edit section: Force fields for crystal systems"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Atomistic interactions in crystal systems significantly deviate from those in molecular systems,<sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> e.g. of organic molecules. For crystal systems, particularly multi-body interactions, these interactions are important and cannot be neglected if a high accuracy of the force field is the aim. For crystal systems with covalent bonding, <a href="/wiki/Bond_order_potential" title="Bond order potential">bond order potentials</a> are usually used, e.g. Tersoff potentials.<sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup> For metal systems, usually <a href="/wiki/Embedded_atom_model" title="Embedded atom model">embedded atom potentials</a><sup id="cite_ref-15" class="reference"><a href="#cite_note-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-16" class="reference"><a href="#cite_note-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup> are used. Additionally, <a href="/wiki/Drude_model" title="Drude model">Drude model</a> potentials have been developed,<sup id="cite_ref-17" class="reference"><a href="#cite_note-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup> which describe a form of attachment of electrons to nuclei.<sup id="cite_ref-18" class="reference"><a href="#cite_note-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Drude_1900_19-0" class="reference"><a href="#cite_note-Drude_1900-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Parameterization">Parameterization</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Force_field_(chemistry)&action=edit&section=5" title="Edit section: Parameterization"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>In addition to the functional form of the potentials, a force fields consists of the parameters of these functions. Together, they specify the interactions on the atomistic level. The parametrization, i.e. determining of the parameter values, is crucial for the accuracy and reliability of the force field. Different parametrization procedures have been developed for the parametrization of different substances, e.g. metals, ions, and molecules. For different material types, usually different parametrization strategies are used. In general, two main types can be distinguished for the parametrization, either using data/ information from the atomistic level, e.g. from quantum mechanical calculations or spectroscopic data, or using data from macroscopic properties, e.g. the hardness or compressibility of a given material. Often a combination of these routes is used. Hence, one way or the other, the force field parameters are always determined in an empirical way. Nevertheless, the term 'empirical' is often used in the context of force field parameters when macroscopic material property data was used for the fitting. Experimental data (microscopic and macroscopic) included for the fit, for example, the <a href="/wiki/Enthalpy_of_vaporization" title="Enthalpy of vaporization">enthalpy of vaporization</a>, <a href="/wiki/Enthalpy" title="Enthalpy">enthalpy</a> of <a href="/wiki/Sublimation_(chemistry)" class="mw-redirect" title="Sublimation (chemistry)">sublimation</a>, <a href="/wiki/Molecular_dipole_moment" class="mw-redirect" title="Molecular dipole moment">dipole moments</a>, and various spectroscopic properties such as vibrational frequencies.<sup id="cite_ref-20" class="reference"><a href="#cite_note-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Sun_1994_9-1" class="reference"><a href="#cite_note-Sun_1994-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Dauber-Osguthorpe_1988_21-0" class="reference"><a href="#cite_note-Dauber-Osguthorpe_1988-21"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup> Often, for molecular systems, quantum mechanical calculations in the gas phase are used for parametrizing intramolecular interactions and parametrizing intermolecular dispersive interactions by using macroscopic properties such as liquid densities.<sup id="cite_ref-:0_3-1" class="reference"><a href="#cite_note-:0-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-22" class="reference"><a href="#cite_note-22"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-23" class="reference"><a href="#cite_note-23"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup> The assignment of atomic charges often follows quantum mechanical protocols with some heuristics, which can lead to significant deviation in representing specific properties.<sup id="cite_ref-24" class="reference"><a href="#cite_note-24"><span class="cite-bracket">[</span>24<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-25" class="reference"><a href="#cite_note-25"><span class="cite-bracket">[</span>25<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Heinz_2004_26-0" class="reference"><a href="#cite_note-Heinz_2004-26"><span class="cite-bracket">[</span>26<span class="cite-bracket">]</span></a></sup> </p><p>A large number of workflows and parametrization procedures have been employed in the past decades using different data and optimization strategies for determining the force field parameters. They differ significantly, which is also due to different focuses of different developments. The parameters for molecular simulations of biological <a href="/wiki/Macromolecule" title="Macromolecule">macromolecules</a> such as <a href="/wiki/Protein" title="Protein">proteins</a>, <a href="/wiki/DNA" title="DNA">DNA</a>, and <a href="/wiki/RNA" title="RNA">RNA</a> were often derived/transferred from observations for small <a href="/wiki/Organic_compound" title="Organic compound">organic molecules</a>, which are more accessible for experimental studies and quantum calculations. </p><p>Atom types are defined for different elements as well as for the same elements in sufficiently different chemical environments. For example, <a href="/wiki/Oxygen" title="Oxygen">oxygen</a> atoms in <a href="/wiki/Water" title="Water">water</a> and an oxygen atoms in a <a href="/wiki/Carbonyl" class="mw-redirect" title="Carbonyl">carbonyl</a> <a href="/wiki/Functional_group" title="Functional group">functional group</a> are classified as different force field types.<sup id="cite_ref-Dauber-Osguthorpe_1988_21-1" class="reference"><a href="#cite_note-Dauber-Osguthorpe_1988-21"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup> Typical molecular force field parameter sets include values for <a href="/wiki/Atomic_mass" title="Atomic mass">atomic mass</a>, <a href="/wiki/Partial_charge" title="Partial charge">atomic charge</a>, <a href="/wiki/Lennard-Jones_potential" title="Lennard-Jones potential">Lennard-Jones parameters</a> for every atom type, as well as equilibrium values of <a href="/wiki/Bond_length" title="Bond length">bond lengths</a>, <a href="/wiki/Molecular_geometry" title="Molecular geometry">bond angles</a>, and <a href="/wiki/Dihedral_angle" title="Dihedral angle">dihedral angles</a>.<sup id="cite_ref-27" class="reference"><a href="#cite_note-27"><span class="cite-bracket">[</span>27<span class="cite-bracket">]</span></a></sup> The bonded terms refer to pairs, triplets, and quadruplets of bonded atoms, and include values for the effective <a href="/wiki/Spring_constant" class="mw-redirect" title="Spring constant">spring constant</a> for each potential. </p><p>Heuristic force field parametrization procedures have been very successful for many years, but recently criticized<sup id="cite_ref-28" class="reference"><a href="#cite_note-28"><span class="cite-bracket">[</span>28<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-McDonagh_J._L._2019_4278–4288_29-0" class="reference"><a href="#cite_note-McDonagh_J._L._2019_4278–4288-29"><span class="cite-bracket">[</span>29<span class="cite-bracket">]</span></a></sup> since they are usually not fully automated and therefore subject to some subjectivity of the developers, which also brings problems regarding the reproducibility of the parametrization procedure. </p><p>Efforts to provide open source codes and methods include <a rel="nofollow" class="external text" href="http://openmm.org">openMM</a> and <a rel="nofollow" class="external text" href="http://openmd.org">openMD</a>. The use of semi-automation or full automation, without input from chemical knowledge, is likely to increase inconsistencies at the level of atomic charges, for the assignment of remaining parameters, and likely to dilute the interpretability and performance of parameters. </p> <div class="mw-heading mw-heading2"><h2 id="Force_field_databases">Force field databases</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Force_field_(chemistry)&action=edit&section=6" title="Edit section: Force field databases"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>A large number of force fields has been published in the past decades - mostly in scientific publications. In recent years, some databases have attempted to collect, categorize and make force fields digitally available. Therein, different databases focus on different types of force fields. For example, the <a rel="nofollow" class="external text" href="https://openkim.org/browse/models/by-species">openKim database</a> focuses on interatomic functions describing the individual interactions between specific elements.<sup id="cite_ref-30" class="reference"><a href="#cite_note-30"><span class="cite-bracket">[</span>30<span class="cite-bracket">]</span></a></sup> The <a rel="nofollow" class="external text" href="http://trappe.oit.umn.edu/">TraPPE database</a> focuses on transferable force fields of organic molecules (developed by the Siepmann group).<sup id="cite_ref-:2_31-0" class="reference"><a href="#cite_note-:2-31"><span class="cite-bracket">[</span>31<span class="cite-bracket">]</span></a></sup> The <a rel="nofollow" class="external text" href="https://molmod.boltzmann-zuse.de/">MolMod database</a> focuses on molecular and ionic force fields (both component-specific and transferable).<sup id="cite_ref-tandfonline.com_5-1" class="reference"><a href="#cite_note-tandfonline.com-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-32" class="reference"><a href="#cite_note-32"><span class="cite-bracket">[</span>32<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Transferability_and_mixing_function_types">Transferability and mixing function types</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Force_field_(chemistry)&action=edit&section=7" title="Edit section: Transferability and mixing function types"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Functional forms and parameter sets have been defined by the developers of interatomic potentials and feature variable degrees of <a href="/wiki/Self-consistent" class="mw-redirect" title="Self-consistent">self-consistency</a> and transferability. When functional forms of the potential terms vary or are mixed, the parameters from one interatomic potential function can typically not be used together with another interatomic potential function.<sup id="cite_ref-Heinz_2016_33-0" class="reference"><a href="#cite_note-Heinz_2016-33"><span class="cite-bracket">[</span>33<span class="cite-bracket">]</span></a></sup> In some cases, modifications can be made with minor effort, for example, between 9-6 Lennard-Jones potentials to 12-6 Lennard-Jones potentials.<sup id="cite_ref-Mishra_2014_12-1" class="reference"><a href="#cite_note-Mishra_2014-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> Transfers from Buckingham potentials to harmonic potentials, or from <a href="/wiki/Embedded_atom_model" title="Embedded atom model">Embedded Atom Models</a> to harmonic potentials, on the contrary, would require many additional assumptions and may not be possible. </p><p>In many cases, force fields can be straight forwardly combined. Yet, often, additional specifications and assumptions are required. </p> <div class="mw-heading mw-heading2"><h2 id="Limitations">Limitations</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Force_field_(chemistry)&action=edit&section=8" title="Edit section: Limitations"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>All <a href="/wiki/Interatomic_potential" title="Interatomic potential">interatomic potentials</a> are based on approximations and experimental data, therefore often termed <i>empirical</i>. The performance varies from higher accuracy than <a href="/wiki/Density_functional_theory" title="Density functional theory">density functional theory</a> (DFT) calculations, with access to million times larger systems and time scales, to random guesses depending on the force field.<sup id="cite_ref-34" class="reference"><a href="#cite_note-34"><span class="cite-bracket">[</span>34<span class="cite-bracket">]</span></a></sup> The use of accurate representations of chemical bonding, combined with reproducible experimental data and validation, can lead to lasting interatomic potentials of high quality with much fewer parameters and assumptions in comparison to DFT-level quantum methods.<sup id="cite_ref-35" class="reference"><a href="#cite_note-35"><span class="cite-bracket">[</span>35<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-36" class="reference"><a href="#cite_note-36"><span class="cite-bracket">[</span>36<span class="cite-bracket">]</span></a></sup> </p><p>Possible limitations include atomic charges, also called point charges. Most force fields rely on point charges to reproduce the electrostatic potential around molecules, which works less well for <a href="/wiki/Anisotropy" title="Anisotropy">anisotropic</a> charge distributions.<sup id="cite_ref-37" class="reference"><a href="#cite_note-37"><span class="cite-bracket">[</span>37<span class="cite-bracket">]</span></a></sup> The remedy is that point charges have a clear interpretation<sup id="cite_ref-Heinz_2004_26-1" class="reference"><a href="#cite_note-Heinz_2004-26"><span class="cite-bracket">[</span>26<span class="cite-bracket">]</span></a></sup> and virtual electrons can be added to capture essential features of the electronic structure, such additional polarizability in metallic systems to describe the image potential, internal multipole moments in π-conjugated systems, and lone pairs in water.<sup id="cite_ref-38" class="reference"><a href="#cite_note-38"><span class="cite-bracket">[</span>38<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Xu_2015_39-0" class="reference"><a href="#cite_note-Xu_2015-39"><span class="cite-bracket">[</span>39<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Pramanik_2017_40-0" class="reference"><a href="#cite_note-Pramanik_2017-40"><span class="cite-bracket">[</span>40<span class="cite-bracket">]</span></a></sup> Electronic <a href="/wiki/Dielectric_polarization" class="mw-redirect" title="Dielectric polarization">polarization</a> of the environment may be better included by using <i>polarizable force fields</i><sup id="cite_ref-Lomize_2002_41-0" class="reference"><a href="#cite_note-Lomize_2002-41"><span class="cite-bracket">[</span>41<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-warshel_42-0" class="reference"><a href="#cite_note-warshel-42"><span class="cite-bracket">[</span>42<span class="cite-bracket">]</span></a></sup> or using a macroscopic <a href="/wiki/Dielectric_constant" class="mw-redirect" title="Dielectric constant">dielectric constant</a>. However, application of one value of dielectric constant is a coarse approximation in the highly heterogeneous environments of proteins, biological membranes, minerals, or electrolytes.<sup id="cite_ref-Shultz_43-0" class="reference"><a href="#cite_note-Shultz-43"><span class="cite-bracket">[</span>43<span class="cite-bracket">]</span></a></sup> </p><p>All types of <a href="/wiki/Van_der_Waals_force" title="Van der Waals force">van der Waals forces</a> are also strongly environment-dependent because these forces originate from interactions of induced and "instantaneous" dipoles (see <a href="/wiki/Intermolecular_force" title="Intermolecular force">Intermolecular force</a>). The original <a href="/wiki/Fritz_London" title="Fritz London">Fritz London</a> theory of these forces applies only in a vacuum. A more general theory of van der Waals forces in condensed media was developed by A. D. McLachlan in 1963 and included the original London's approach as a special case.<sup id="cite_ref-Israelachvili_2011_44-0" class="reference"><a href="#cite_note-Israelachvili_2011-44"><span class="cite-bracket">[</span>44<span class="cite-bracket">]</span></a></sup> The McLachlan theory predicts that van der Waals attractions in media are weaker than in vacuum and follow the <i>like dissolves like</i> rule, which means that different types of atoms interact more weakly than identical types of atoms.<sup id="cite_ref-Leckband_45-0" class="reference"><a href="#cite_note-Leckband-45"><span class="cite-bracket">[</span>45<span class="cite-bracket">]</span></a></sup> This is in contrast to <i>combinatorial rules</i> or Slater-Kirkwood equation applied for development of the classical force fields. The <i>combinatorial rules</i> state that the interaction energy of two dissimilar atoms (e.g., C...N) is an average of the interaction energies of corresponding identical atom pairs (i.e., C...C and N...N). According to McLachlan's theory, the interactions of particles in media can even be fully repulsive, as observed for liquid <a href="/wiki/Helium" title="Helium">helium</a>,<sup id="cite_ref-Israelachvili_2011_44-1" class="reference"><a href="#cite_note-Israelachvili_2011-44"><span class="cite-bracket">[</span>44<span class="cite-bracket">]</span></a></sup> however, the lack of vaporization and presence of a freezing point contradicts a theory of purely repulsive interactions. Measurements of attractive forces between different materials (<a href="/wiki/Hamaker_constant" title="Hamaker constant">Hamaker constant</a>) have been explained by <a href="/wiki/Jacob_Israelachvili" title="Jacob Israelachvili">Jacob Israelachvili</a>.<sup id="cite_ref-Israelachvili_2011_44-2" class="reference"><a href="#cite_note-Israelachvili_2011-44"><span class="cite-bracket">[</span>44<span class="cite-bracket">]</span></a></sup> For example, "<i>the interaction between hydrocarbons across water is about 10% of that across vacuum</i>".<sup id="cite_ref-Israelachvili_2011_44-3" class="reference"><a href="#cite_note-Israelachvili_2011-44"><span class="cite-bracket">[</span>44<span class="cite-bracket">]</span></a></sup> Such effects are represented in molecular dynamics through pairwise interactions that are spatially more dense in the condensed phase relative to the gas phase and reproduced once the parameters for all phases are validated to reproduce chemical bonding, density, and cohesive/surface energy. </p><p>Limitations have been strongly felt in protein structure refinement. The major underlying challenge is the huge conformation space of polymeric molecules, which grows beyond current computational feasibility when containing more than ~20 monomers.<sup id="cite_ref-46" class="reference"><a href="#cite_note-46"><span class="cite-bracket">[</span>46<span class="cite-bracket">]</span></a></sup> Participants in <a href="/wiki/Critical_Assessment_of_protein_Structure_Prediction" class="mw-redirect" title="Critical Assessment of protein Structure Prediction">Critical Assessment of protein Structure Prediction</a> (CASP) did not try to refine their models to avoid "<i>a central embarrassment of molecular mechanics, namely that energy minimization or molecular dynamics generally leads to a model that is less like the experimental structure</i>".<sup id="cite_ref-Koehl_47-0" class="reference"><a href="#cite_note-Koehl-47"><span class="cite-bracket">[</span>47<span class="cite-bracket">]</span></a></sup> Force fields have been applied successfully for protein structure refinement in different <a href="/wiki/X-ray_crystallography" title="X-ray crystallography">X-ray crystallography</a> and <a href="/wiki/NMR_spectroscopy" class="mw-redirect" title="NMR spectroscopy">NMR spectroscopy</a> applications, especially using program XPLOR.<sup id="cite_ref-Brunger_48-0" class="reference"><a href="#cite_note-Brunger-48"><span class="cite-bracket">[</span>48<span class="cite-bracket">]</span></a></sup> However, the refinement is driven mainly by a set of experimental constraints and the interatomic potentials serve mainly to remove interatomic hindrances. The results of calculations were practically the same with rigid sphere potentials implemented in program DYANA<sup id="cite_ref-Guntert_49-0" class="reference"><a href="#cite_note-Guntert-49"><span class="cite-bracket">[</span>49<span class="cite-bracket">]</span></a></sup> (calculations from NMR data), or with programs for crystallographic refinement that use no energy functions at all. These shortcomings are related to interatomic potentials and to the inability to sample the conformation space of large molecules effectively.<sup id="cite_ref-50" class="reference"><a href="#cite_note-50"><span class="cite-bracket">[</span>50<span class="cite-bracket">]</span></a></sup> Thereby also the development of parameters to tackle such large-scale problems requires new approaches. A specific problem area is <a href="/wiki/Homology_modeling" title="Homology modeling">homology modeling</a> of proteins.<sup id="cite_ref-Tramontano_51-0" class="reference"><a href="#cite_note-Tramontano-51"><span class="cite-bracket">[</span>51<span class="cite-bracket">]</span></a></sup> Meanwhile, alternative empirical scoring functions have been developed for <a href="/wiki/Ligand_docking" class="mw-redirect" title="Ligand docking">ligand docking</a>,<sup id="cite_ref-Gohlke_52-0" class="reference"><a href="#cite_note-Gohlke-52"><span class="cite-bracket">[</span>52<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Protein_folding" title="Protein folding">protein folding</a>,<sup id="cite_ref-Edgcomb_53-0" class="reference"><a href="#cite_note-Edgcomb-53"><span class="cite-bracket">[</span>53<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Lazaridis_54-0" class="reference"><a href="#cite_note-Lazaridis-54"><span class="cite-bracket">[</span>54<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-awml_55-0" class="reference"><a href="#cite_note-awml-55"><span class="cite-bracket">[</span>55<span class="cite-bracket">]</span></a></sup> homology model refinement,<sup id="cite_ref-krieger_56-0" class="reference"><a href="#cite_note-krieger-56"><span class="cite-bracket">[</span>56<span class="cite-bracket">]</span></a></sup> computational <a href="/wiki/Protein_design" title="Protein design">protein design</a>,<sup id="cite_ref-Gordon_57-0" class="reference"><a href="#cite_note-Gordon-57"><span class="cite-bracket">[</span>57<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Mendes_58-0" class="reference"><a href="#cite_note-Mendes-58"><span class="cite-bracket">[</span>58<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Rohl_59-0" class="reference"><a href="#cite_note-Rohl-59"><span class="cite-bracket">[</span>59<span class="cite-bracket">]</span></a></sup> and modeling of proteins in membranes.<sup id="cite_ref-Lomize1_60-0" class="reference"><a href="#cite_note-Lomize1-60"><span class="cite-bracket">[</span>60<span class="cite-bracket">]</span></a></sup> </p><p>It was also argued that some protein force fields operate with energies that are irrelevant to protein folding or ligand binding.<sup id="cite_ref-Lomize_2002_41-1" class="reference"><a href="#cite_note-Lomize_2002-41"><span class="cite-bracket">[</span>41<span class="cite-bracket">]</span></a></sup> The parameters of proteins force fields reproduce the <a href="/wiki/Enthalpy" title="Enthalpy">enthalpy</a> of <a href="/wiki/Sublimation_(physics)" class="mw-redirect" title="Sublimation (physics)">sublimation</a>, i.e., energy of evaporation of molecular crystals. However, <a href="/wiki/Protein_folding" title="Protein folding">protein folding</a> and <a href="/wiki/Ligand_binding" class="mw-redirect" title="Ligand binding">ligand binding</a> are thermodynamically closer to <a href="/wiki/Crystallization" title="Crystallization">crystallization</a>, or liquid-solid transitions as these processes represent <i>freezing</i> of mobile molecules in condensed media.<sup id="cite_ref-Murphy_61-0" class="reference"><a href="#cite_note-Murphy-61"><span class="cite-bracket">[</span>61<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Shakhnovich_62-0" class="reference"><a href="#cite_note-Shakhnovich-62"><span class="cite-bracket">[</span>62<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Graziano_63-0" class="reference"><a href="#cite_note-Graziano-63"><span class="cite-bracket">[</span>63<span class="cite-bracket">]</span></a></sup> Thus, free energy changes during protein folding or ligand binding are expected to represent a combination of an energy similar to <a href="/wiki/Heat_of_fusion" class="mw-redirect" title="Heat of fusion">heat of fusion</a> (energy absorbed during melting of molecular crystals), a <a href="/wiki/Conformational_entropy" title="Conformational entropy">conformational entropy</a> contribution, and <a href="/wiki/Solvation" title="Solvation">solvation</a> free energy. The <a href="/wiki/Heat_of_fusion" class="mw-redirect" title="Heat of fusion">heat of fusion</a> is significantly smaller than enthalpy of sublimation.<sup id="cite_ref-Israelachvili_2011_44-4" class="reference"><a href="#cite_note-Israelachvili_2011-44"><span class="cite-bracket">[</span>44<span class="cite-bracket">]</span></a></sup> Hence, the potentials describing protein folding or ligand binding need more consistent parameterization protocols, e.g., as described for IFF. Indeed, the energies of <a href="/wiki/H-bond" class="mw-redirect" title="H-bond">H-bonds</a> in proteins are ~ -1.5 kcal/mol when estimated from <a href="/wiki/Protein_engineering" title="Protein engineering">protein engineering</a> or <a href="/wiki/Alpha_helix" title="Alpha helix">alpha helix</a> to <a href="/wiki/Random_coil" title="Random coil">coil</a> transition data,<sup id="cite_ref-Myers_64-0" class="reference"><a href="#cite_note-Myers-64"><span class="cite-bracket">[</span>64<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Scholtz_65-0" class="reference"><a href="#cite_note-Scholtz-65"><span class="cite-bracket">[</span>65<span class="cite-bracket">]</span></a></sup> but the same energies estimated from <a href="/wiki/Sublimation_(physics)" class="mw-redirect" title="Sublimation (physics)">sublimation</a> <a href="/wiki/Enthalpy" title="Enthalpy">enthalpy</a> of molecular <a href="/wiki/Crystal" title="Crystal">crystals</a> were -4 to -6 kcal/mol,<sup id="cite_ref-Gavezotti_66-0" class="reference"><a href="#cite_note-Gavezotti-66"><span class="cite-bracket">[</span>66<span class="cite-bracket">]</span></a></sup> which is related to re-forming existing hydrogen bonds and not forming hydrogen bonds from scratch. The depths of modified <a href="/wiki/Lennard-Jones_potential" title="Lennard-Jones potential">Lennard-Jones potentials</a> derived from protein engineering data were also smaller than in typical potential parameters and followed the <i>like dissolves like</i> rule, as predicted by McLachlan theory.<sup id="cite_ref-Lomize_2002_41-2" class="reference"><a href="#cite_note-Lomize_2002-41"><span class="cite-bracket">[</span>41<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Force_fields_available_in_literature">Force fields available in literature</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Force_field_(chemistry)&action=edit&section=9" title="Edit section: Force fields available in literature"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Further information: <a href="/wiki/Comparison_of_force_field_implementations" class="mw-redirect" title="Comparison of force field implementations">Comparison of force field implementations</a>, <a href="/wiki/Molecular_design_software" title="Molecular design software">Molecular design software</a>, and <a href="/wiki/Comparison_of_software_for_molecular_mechanics_modeling" title="Comparison of software for molecular mechanics modeling">Comparison of software for molecular mechanics modeling</a></div> <p>Different force fields are designed for different purposes: </p> <div class="mw-heading mw-heading3"><h3 id="Classical">Classical</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Force_field_(chemistry)&action=edit&section=10" title="Edit section: Classical"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/AMBER" title="AMBER">AMBER</a> (Assisted Model Building and Energy Refinement) – widely used for proteins and DNA.</li> <li>CFF (Consistent Force Field) – a family of force fields adapted to a broad variety of organic compounds, includes force fields for polymers, metals, etc. CFF was developed by <a href="/wiki/Arieh_Warshel" title="Arieh Warshel">Arieh Warshel</a>, Lifson, and coworkers as a general method for unifying studies of energies, structures, and vibration of general molecules and molecular crystals. The CFF program, developed by Levitt and Warshel, is based on the Cartesian representation of all the atoms, and it served as the basis for many subsequent simulation programs.</li> <li><a href="/wiki/CHARMM" title="CHARMM">CHARMM</a> (Chemistry at HARvard Molecular Mechanics) – originally developed at Harvard, widely used for both small molecules and macromolecules</li> <li>COSMOS-NMR – hybrid QM/MM force field adapted to various inorganic compounds, organic compounds, and biological macromolecules, including semi-empirical calculation of atomic charges NMR properties. COSMOS-NMR is optimized for NMR-based structure elucidation and implemented in COSMOS molecular modelling package.<sup id="cite_ref-67" class="reference"><a href="#cite_note-67"><span class="cite-bracket">[</span>67<span class="cite-bracket">]</span></a></sup></li> <li>CVFF – also used broadly for small molecules and macromolecules.<sup id="cite_ref-Dauber-Osguthorpe_1988_21-2" class="reference"><a href="#cite_note-Dauber-Osguthorpe_1988-21"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup></li> <li>ECEPP<sup id="cite_ref-68" class="reference"><a href="#cite_note-68"><span class="cite-bracket">[</span>68<span class="cite-bracket">]</span></a></sup> – first force field for polypeptide molecules - developed by F.A. Momany, H.A. Scheraga and colleagues.<sup id="cite_ref-Momany_69-0" class="reference"><a href="#cite_note-Momany-69"><span class="cite-bracket">[</span>69<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Arnautova_70-0" class="reference"><a href="#cite_note-Arnautova-70"><span class="cite-bracket">[</span>70<span class="cite-bracket">]</span></a></sup> ECEPP was developed specifically for the modeling of peptides and proteins. It uses fixed geometries of amino acid residues to simplify the potential energy surface. Thus, the energy minimization is conducted in the space of protein torsion angles. Both MM2 and ECEPP include potentials for H-bonds and torsion potentials for describing rotations around single bonds. ECEPP/3 was implemented (with some modifications) in <a href="/wiki/Internal_Coordinate_Mechanics" title="Internal Coordinate Mechanics">Internal Coordinate Mechanics</a> and FANTOM.<sup id="cite_ref-Schaumann_71-0" class="reference"><a href="#cite_note-Schaumann-71"><span class="cite-bracket">[</span>71<span class="cite-bracket">]</span></a></sup></li> <li><a href="/wiki/GROMOS" title="GROMOS">GROMOS</a> (GROningen MOlecular Simulation) – a force field that comes as part of the GROMOS software, a general-purpose molecular dynamics computer simulation package for the study of biomolecular systems.<sup id="cite_ref-72" class="reference"><a href="#cite_note-72"><span class="cite-bracket">[</span>72<span class="cite-bracket">]</span></a></sup> GROMOS force field A-version has been developed for application to aqueous or apolar solutions of proteins, nucleotides, and sugars. A B-version to simulate gas phase isolated molecules is also available.</li> <li>IFF (Interface Force Field) – covers metals, minerals, 2D materials, and polymers. It uses 12-6 LJ and 9-6 LJ interactions.<sup id="cite_ref-Heinz_2013_73-0" class="reference"><a href="#cite_note-Heinz_2013-73"><span class="cite-bracket">[</span>73<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-IFF_74-0" class="reference"><a href="#cite_note-IFF-74"><span class="cite-bracket">[</span>74<span class="cite-bracket">]</span></a></sup> IFF was developed as for compounds across the periodic table. It assigs consistent charges, utilizes standard conditions as a reference state, reproduces structures, energies, and energy derivatives, and quantifies limitations for all included compounds.<sup id="cite_ref-Heinz_2013_73-1" class="reference"><a href="#cite_note-Heinz_2013-73"><span class="cite-bracket">[</span>73<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Mishra_2017_75-0" class="reference"><a href="#cite_note-Mishra_2017-75"><span class="cite-bracket">[</span>75<span class="cite-bracket">]</span></a></sup> The <a rel="nofollow" class="external text" href="https://bionanostructures.com/interface-md/">Interface force field</a> (IFF) assumes one single energy expression for all compounds across the periodic (with 9-6 and 12-6 LJ options). The IFF is in most parts non-polarizable, but also comprises polarizable parts, e.g. for some metals (Au, W) and pi-conjugated molecules<sup id="cite_ref-Geada_2018_76-0" class="reference"><a href="#cite_note-Geada_2018-76"><span class="cite-bracket">[</span>76<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Pramanik_2017_40-1" class="reference"><a href="#cite_note-Pramanik_2017-40"><span class="cite-bracket">[</span>40<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Xu_2015_39-1" class="reference"><a href="#cite_note-Xu_2015-39"><span class="cite-bracket">[</span>39<span class="cite-bracket">]</span></a></sup></li> <li>MMFF (<a href="/wiki/Merck_Molecular_Force_Field" class="mw-redirect" title="Merck Molecular Force Field">Merck Molecular Force Field</a>) – developed at Merck for a broad range of molecules.</li> <li>MM2 was developed by <a href="/wiki/Norman_Allinger" title="Norman Allinger">Norman Allinger</a> mainly for conformational analysis of <a href="/wiki/Hydrocarbon" title="Hydrocarbon">hydrocarbons</a> and other small organic molecules. It is designed to reproduce the equilibrium covalent geometry of molecules as precisely as possible. It implements a large set of parameters that is continuously refined and updated for many different classes of organic compounds (MM3 and MM4).<sup id="cite_ref-77" class="reference"><a href="#cite_note-77"><span class="cite-bracket">[</span>77<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-78" class="reference"><a href="#cite_note-78"><span class="cite-bracket">[</span>78<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-79" class="reference"><a href="#cite_note-79"><span class="cite-bracket">[</span>79<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-80" class="reference"><a href="#cite_note-80"><span class="cite-bracket">[</span>80<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-81" class="reference"><a href="#cite_note-81"><span class="cite-bracket">[</span>81<span class="cite-bracket">]</span></a></sup></li> <li><a href="/wiki/OPLS" title="OPLS">OPLS</a> (Optimized Potential for Liquid Simulations) (variants include OPLS-AA, OPLS-UA, OPLS-2001, OPLS-2005, OPLS3e, OPLS4) – developed by <a href="/wiki/William_L._Jorgensen" title="William L. Jorgensen">William L. Jorgensen</a> at the Yale University Department of Chemistry.</li> <li>QCFF/PI – A general force fields for conjugated molecules.<sup id="cite_ref-warshel2_82-0" class="reference"><a href="#cite_note-warshel2-82"><span class="cite-bracket">[</span>82<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-warshel-levitt_83-0" class="reference"><a href="#cite_note-warshel-levitt-83"><span class="cite-bracket">[</span>83<span class="cite-bracket">]</span></a></sup></li> <li>UFF (Universal Force Field) – A general force field with parameters for the full periodic table up to and including the actinoids, developed at Colorado State University.<sup id="cite_ref-Rappé_1992_84-0" class="reference"><a href="#cite_note-Rappé_1992-84"><span class="cite-bracket">[</span>84<span class="cite-bracket">]</span></a></sup> The reliability is known to be poor due to lack of validation and interpretation of the parameters for nearly all claimed compounds, especially metals and inorganic compounds.<sup id="cite_ref-Heinz_2005_85-0" class="reference"><a href="#cite_note-Heinz_2005-85"><span class="cite-bracket">[</span>85<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Mishra_2017_75-1" class="reference"><a href="#cite_note-Mishra_2017-75"><span class="cite-bracket">[</span>75<span class="cite-bracket">]</span></a></sup></li></ul> <div class="mw-heading mw-heading3"><h3 id="Polarizable">Polarizable</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Force_field_(chemistry)&action=edit&section=11" title="Edit section: Polarizable"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Several force fields explicitly capture <a href="/wiki/Polarizability" title="Polarizability">polarizability</a>, where a particle's effective charge can be influenced by electrostatic interactions with its neighbors. Core-shell models are common, which consist of a positively charged core particle, representing the polarizable atom, and a negatively charged particle attached to the core atom through a spring-like <a href="/wiki/Harmonic_oscillator" title="Harmonic oscillator">harmonic oscillator</a> potential.<sup id="cite_ref-86" class="reference"><a href="#cite_note-86"><span class="cite-bracket">[</span>86<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-87" class="reference"><a href="#cite_note-87"><span class="cite-bracket">[</span>87<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-88" class="reference"><a href="#cite_note-88"><span class="cite-bracket">[</span>88<span class="cite-bracket">]</span></a></sup> Recent examples include polarizable models with virtual electrons that reproduce image charges in metals<sup id="cite_ref-Geada_2018_76-1" class="reference"><a href="#cite_note-Geada_2018-76"><span class="cite-bracket">[</span>76<span class="cite-bracket">]</span></a></sup> and polarizable biomolecular force fields.<sup id="cite_ref-CPFF0_89-0" class="reference"><a href="#cite_note-CPFF0-89"><span class="cite-bracket">[</span>89<span class="cite-bracket">]</span></a></sup> </p> <ul><li>AMBER – polarizable force field developed by Jim Caldwell and coworkers.<sup id="cite_ref-90" class="reference"><a href="#cite_note-90"><span class="cite-bracket">[</span>90<span class="cite-bracket">]</span></a></sup></li> <li>AMOEBA (Atomic Multipole Optimized Energetics for Biomolecular Applications) – force field developed by Pengyu Ren (University of Texas at Austin) and Jay W. Ponder (Washington University).<sup id="cite_ref-91" class="reference"><a href="#cite_note-91"><span class="cite-bracket">[</span>91<span class="cite-bracket">]</span></a></sup> AMOEBA force field is gradually moving to more physics-rich AMOEBA+.<sup id="cite_ref-92" class="reference"><a href="#cite_note-92"><span class="cite-bracket">[</span>92<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-93" class="reference"><a href="#cite_note-93"><span class="cite-bracket">[</span>93<span class="cite-bracket">]</span></a></sup></li> <li>CHARMM – polarizable force field developed by S. Patel (University of Delaware) and C. L. Brooks III (University of Michigan).<sup id="cite_ref-CPFF0_89-1" class="reference"><a href="#cite_note-CPFF0-89"><span class="cite-bracket">[</span>89<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-CPFF1_94-0" class="reference"><a href="#cite_note-CPFF1-94"><span class="cite-bracket">[</span>94<span class="cite-bracket">]</span></a></sup> Based on the classical Drude oscillator developed by <a href="/wiki/Alexander_D._MacKerell,_Jr." class="mw-redirect" title="Alexander D. MacKerell, Jr.">Alexander MacKerell</a> (University of Maryland, Baltimore) and <a href="/wiki/Beno%C3%AEt_Roux" title="Benoît Roux">Benoit Roux</a> (University of Chicago).<sup id="cite_ref-drude1_95-0" class="reference"><a href="#cite_note-drude1-95"><span class="cite-bracket">[</span>95<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-drude2_96-0" class="reference"><a href="#cite_note-drude2-96"><span class="cite-bracket">[</span>96<span class="cite-bracket">]</span></a></sup></li> <li>CFF/ind and ENZYMIX – The first polarizable force field<sup id="cite_ref-awml3_97-0" class="reference"><a href="#cite_note-awml3-97"><span class="cite-bracket">[</span>97<span class="cite-bracket">]</span></a></sup> which has subsequently been used in many applications to biological systems.<sup id="cite_ref-warshel_42-1" class="reference"><a href="#cite_note-warshel-42"><span class="cite-bracket">[</span>42<span class="cite-bracket">]</span></a></sup></li> <li>COSMOS-NMR (Computer Simulation of Molecular Structure) – developed by Ulrich Sternberg and coworkers. Hybrid QM/MM force field enables explicit quantum-mechanical calculation of electrostatic properties using localized bond orbitals with fast BPT formalism.<sup id="cite_ref-98" class="reference"><a href="#cite_note-98"><span class="cite-bracket">[</span>98<span class="cite-bracket">]</span></a></sup> Atomic charge fluctuation is possible in each molecular dynamics step.</li> <li>DRF90 – developed by P. Th. van Duijnen and coworkers.<sup id="cite_ref-99" class="reference"><a href="#cite_note-99"><span class="cite-bracket">[</span>99<span class="cite-bracket">]</span></a></sup></li> <li>NEMO (Non-Empirical Molecular Orbital) – procedure developed by Gunnar Karlström and coworkers at Lund University (Sweden)<sup id="cite_ref-NEMO_100-0" class="reference"><a href="#cite_note-NEMO-100"><span class="cite-bracket">[</span>100<span class="cite-bracket">]</span></a></sup></li> <li>PIPF – The polarizable intermolecular potential for fluids is an induced point-dipole force field for organic liquids and biopolymers. The molecular polarization is based on Thole's interacting dipole (TID) model and was developed by Jiali Gao <a rel="nofollow" class="external text" href="http://jialigao.org">Gao Research Group |</a> at the University of Minnesota.<sup id="cite_ref-pipf_101-0" class="reference"><a href="#cite_note-pipf-101"><span class="cite-bracket">[</span>101<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-pipf2_102-0" class="reference"><a href="#cite_note-pipf2-102"><span class="cite-bracket">[</span>102<span class="cite-bracket">]</span></a></sup></li> <li>Polarizable Force Field (PFF) – developed by Richard A. Friesner and coworkers.<sup id="cite_ref-pmid26641692_103-0" class="reference"><a href="#cite_note-pmid26641692-103"><span class="cite-bracket">[</span>103<span class="cite-bracket">]</span></a></sup></li> <li>SP-basis Chemical Potential Equalization (CPE) – approach developed by R. Chelli and P. Procacci.<sup id="cite_ref-procacci_104-0" class="reference"><a href="#cite_note-procacci-104"><span class="cite-bracket">[</span>104<span class="cite-bracket">]</span></a></sup></li> <li>PHAST – polarizable potential developed by Chris Cioce and coworkers.<sup id="cite_ref-Cioce_105-0" class="reference"><a href="#cite_note-Cioce-105"><span class="cite-bracket">[</span>105<span class="cite-bracket">]</span></a></sup></li> <li>ORIENT – procedure developed by Anthony J. Stone (Cambridge University) and coworkers.<sup id="cite_ref-106" class="reference"><a href="#cite_note-106"><span class="cite-bracket">[</span>106<span class="cite-bracket">]</span></a></sup></li> <li>Gaussian Electrostatic Model (GEM) – a polarizable force field based on Density Fitting developed by Thomas A. Darden and G. Andrés Cisneros at NIEHS; and Jean-Philip Piquemal at Paris VI University.<sup id="cite_ref-SIBGEM_107-0" class="reference"><a href="#cite_note-SIBGEM-107"><span class="cite-bracket">[</span>107<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-GEM0_108-0" class="reference"><a href="#cite_note-GEM0-108"><span class="cite-bracket">[</span>108<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-GEM2_109-0" class="reference"><a href="#cite_note-GEM2-109"><span class="cite-bracket">[</span>109<span class="cite-bracket">]</span></a></sup></li> <li>Atomistic Polarizable Potential for Liquids, Electrolytes, and Polymers(APPLE&P), developed by Oleg Borogin, Dmitry Bedrov and coworkers, which is distributed by Wasatch Molecular Incorporated.<sup id="cite_ref-pmid19637900_110-0" class="reference"><a href="#cite_note-pmid19637900-110"><span class="cite-bracket">[</span>110<span class="cite-bracket">]</span></a></sup></li> <li>Polarizable procedure based on the Kim-Gordon approach developed by Jürg Hutter and coworkers (University of Zürich)<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (May 2010)">citation needed</span></a></i>]</sup></li> <li>GFN-FF (Geometry, Frequency, and Noncovalent Interaction Force-Field) – a completely automated partially polarizable generic force-field for the accurate description of structures and dynamics of large molecules across the periodic table developed by Stefan Grimme and Sebastian Spicher at the University of Bonn.<sup id="cite_ref-gfnff_111-0" class="reference"><a href="#cite_note-gfnff-111"><span class="cite-bracket">[</span>111<span class="cite-bracket">]</span></a></sup></li> <li>WASABe v1.0 PFF (for Water, orgAnic Solvents, And Battery electrolytes) An isotropic atomic dipole polarizable force field for accurate description of battery electrolytes in terms of thermodynamic and dynamic properties for high lithium salt concentrations in sulfonate solvent by Oleg Starovoytov <sup id="cite_ref-WASABe_112-0" class="reference"><a href="#cite_note-WASABe-112"><span class="cite-bracket">[</span>112<span class="cite-bracket">]</span></a></sup></li> <li>XED (eXtended Electron Distribution) - a polarizable force-field created as a modification of an atom-centered charge model, developed by Andy Vinter. Partially charged monopoles are placed surrounding atoms to simulate more geometrically accurate electrostatic potentials at a fraction of the expense of using quantum mechanical methods. Primarily used by software packages supplied by Cresset Biomolecular Discovery.<sup id="cite_ref-113" class="reference"><a href="#cite_note-113"><span class="cite-bracket">[</span>113<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-114" class="reference"><a href="#cite_note-114"><span class="cite-bracket">[</span>114<span class="cite-bracket">]</span></a></sup></li></ul> <div class="mw-heading mw-heading3"><h3 id="Reactive">Reactive</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Force_field_(chemistry)&action=edit&section=12" title="Edit section: Reactive"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>EVB (<a href="/wiki/Empirical_valence_bond" title="Empirical valence bond">Empirical valence bond</a>) – reactive force field introduced by Warshel and coworkers for use in modeling chemical reactions in different environments. The EVB facilitates calculating activation free energies in condensed phases and in <a href="/wiki/Enzyme" title="Enzyme">enzymes</a>.</li> <li><a href="/wiki/ReaxFF" title="ReaxFF">ReaxFF</a> – reactive force field (interatomic potential) developed by Adri van Duin, <a href="/wiki/William_Andrew_Goddard_III" title="William Andrew Goddard III">William Goddard</a> and coworkers. It is slower than classical MD (50x), needs parameter sets with specific validation, and has no validation for surface and interfacial energies. Parameters are non-interpretable. It can be used atomistic-scale dynamical simulations of chemical reactions.<sup id="cite_ref-van_Duin_2001_115-0" class="reference"><a href="#cite_note-van_Duin_2001-115"><span class="cite-bracket">[</span>115<span class="cite-bracket">]</span></a></sup> Parallelized ReaxFF allows reactive simulations on >>1,000,000 atoms on large supercomputers.</li></ul> <div class="mw-heading mw-heading3"><h3 id="Coarse-grained">Coarse-grained</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Force_field_(chemistry)&action=edit&section=13" title="Edit section: Coarse-grained"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>DPD (<a href="/wiki/Dissipative_particle_dynamics" title="Dissipative particle dynamics">Dissipative particle dynamics</a>) – This is a method commonly applied in chemical engineering. It is typically used for studying the hydrodynamics of various simple and complex fluids which require consideration of time and length scales larger than those accessible to classical <a href="/wiki/Molecular_dynamics" title="Molecular dynamics">Molecular dynamics</a>. The potential was originally proposed by Hoogerbrugge and Koelman <sup id="cite_ref-HoogerbruggeKoelman1992_116-0" class="reference"><a href="#cite_note-HoogerbruggeKoelman1992-116"><span class="cite-bracket">[</span>116<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-KoelmanHoogerbrugge1993_117-0" class="reference"><a href="#cite_note-KoelmanHoogerbrugge1993-117"><span class="cite-bracket">[</span>117<span class="cite-bracket">]</span></a></sup> with later modifications by Español and Warren <sup id="cite_ref-EspañolWarren1995_118-0" class="reference"><a href="#cite_note-EspañolWarren1995-118"><span class="cite-bracket">[</span>118<span class="cite-bracket">]</span></a></sup> The current state of the art was well documented in a <a href="/wiki/CECAM" class="mw-redirect" title="CECAM">CECAM</a> workshop in 2008.<sup id="cite_ref-119" class="reference"><a href="#cite_note-119"><span class="cite-bracket">[</span>119<span class="cite-bracket">]</span></a></sup> Recently, work has been undertaken to capture some of the chemical subtitles relevant to solutions. This has led to work considering automated parameterisation of the DPD interaction potentials against experimental observables.<sup id="cite_ref-McDonagh_J._L._2019_4278–4288_29-1" class="reference"><a href="#cite_note-McDonagh_J._L._2019_4278–4288-29"><span class="cite-bracket">[</span>29<span class="cite-bracket">]</span></a></sup></li> <li><a href="/wiki/MARTINI" title="MARTINI">MARTINI</a> – a coarse-grained potential developed by Marrink and coworkers at the <a href="/wiki/University_of_Groningen" title="University of Groningen">University of Groningen</a>, initially developed for molecular dynamics simulations of lipids,<sup id="cite_ref-Marrink_2007_6-1" class="reference"><a href="#cite_note-Marrink_2007-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> later extended to various other molecules. The force field applies a mapping of four heavy atoms to one CG interaction site and is parameterized with the aim of reproducing thermodynamic properties.</li> <li>SAFT – A top-down coarse-grained model developed in the Molecular Systems Engineering group at <a href="/wiki/Imperial_College_London" title="Imperial College London">Imperial College London</a> fitted to liquid phase densities and vapor pressures of pure compounds by using the SAFT equation of state.<sup id="cite_ref-120" class="reference"><a href="#cite_note-120"><span class="cite-bracket">[</span>120<span class="cite-bracket">]</span></a></sup></li> <li>SIRAH – a coarse-grained force field developed by Pantano and coworkers of the Biomolecular Simulations Group, Institut Pasteur of Montevideo, Uruguay; developed for molecular dynamics of water, DNA, and proteins. Free available for AMBER and GROMACS packages.</li> <li>VAMM (Virtual atom molecular mechanics) – a coarse-grained force field developed by Korkut and Hendrickson for molecular mechanics calculations such as large scale conformational transitions based on the virtual interactions of C-alpha atoms. It is a knowledge based force field and formulated to capture features dependent on secondary structure and on residue-specific contact information in proteins.<sup id="cite_ref-pmid19717427_121-0" class="reference"><a href="#cite_note-pmid19717427-121"><span class="cite-bracket">[</span>121<span class="cite-bracket">]</span></a></sup></li></ul> <div class="mw-heading mw-heading3"><h3 id="Machine_learning">Machine learning</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Force_field_(chemistry)&action=edit&section=14" title="Edit section: Machine learning"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>MACE (Multi Atomic Cluster Expansion) is a highly accurate machine learning force field architecture that combines the rigorous many-body expansion of the total potential energy with rotationally equivariant representations of the system.<sup id="cite_ref-122" class="reference"><a href="#cite_note-122"><span class="cite-bracket">[</span>122<span class="cite-bracket">]</span></a></sup></li> <li>ANI (Artificial Narrow Intelligence) is a transferable neural network potential, built from atomic environment vectors, and able to provide DFT accuracy in terms of energies.<sup id="cite_ref-123" class="reference"><a href="#cite_note-123"><span class="cite-bracket">[</span>123<span class="cite-bracket">]</span></a></sup></li> <li>FFLUX (originally QCTFF) <sup id="cite_ref-124" class="reference"><a href="#cite_note-124"><span class="cite-bracket">[</span>124<span class="cite-bracket">]</span></a></sup> A set of trained <a href="/wiki/Kriging" title="Kriging">Kriging</a> models which operate together to provide a molecular force field trained on <a href="/wiki/Atoms_in_molecules" title="Atoms in molecules">Atoms in molecules</a> or Quantum chemical topology energy terms including electrostatic, exchange and electron correlation.<sup id="cite_ref-125" class="reference"><a href="#cite_note-125"><span class="cite-bracket">[</span>125<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-McDonagh_2018_126-0" class="reference"><a href="#cite_note-McDonagh_2018-126"><span class="cite-bracket">[</span>126<span class="cite-bracket">]</span></a></sup></li> <li>TensorMol, a mixed model, a <a href="/wiki/Neural_network" title="Neural network">neural network</a> provides a short-range potential, whilst more traditional potentials add screened long-range terms.</li> <li>Δ-ML not a force field method but a model that adds learnt correctional energy terms to approximate and relatively computationally cheap quantum chemical methods in order to provide an accuracy level of a higher order, more computationally expensive quantum chemical model.<sup id="cite_ref-127" class="reference"><a href="#cite_note-127"><span class="cite-bracket">[</span>127<span class="cite-bracket">]</span></a></sup></li> <li>SchNet a <a href="/wiki/Neural_network" title="Neural network">Neural network</a> utilising continuous-filter convolutional layers, to predict chemical properties and potential energy surfaces.<sup id="cite_ref-128" class="reference"><a href="#cite_note-128"><span class="cite-bracket">[</span>128<span class="cite-bracket">]</span></a></sup></li> <li>PhysNet is a Neural Network-based energy function to predict energies, forces and (fluctuating) partial charges.<sup id="cite_ref-129" class="reference"><a href="#cite_note-129"><span class="cite-bracket">[</span>129<span class="cite-bracket">]</span></a></sup></li></ul> <div class="mw-heading mw-heading3"><h3 id="Water">Water</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Force_field_(chemistry)&action=edit&section=15" title="Edit section: Water"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Water_model" title="Water model">Water model</a></div> <p>The set of parameters used to model water or aqueous solutions (basically a force field for water) is called a <a href="/wiki/Water_model" title="Water model">water model</a>. Many water models have been proposed;<sup id="cite_ref-tandfonline.com_5-2" class="reference"><a href="#cite_note-tandfonline.com-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> some examples are TIP3P, TIP4P,<sup id="cite_ref-:1_2-1" class="reference"><a href="#cite_note-:1-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> SPC, <a href="/wiki/Water_model#Flexible_SPC_water_model" title="Water model">flexible simple point charge water model</a> (flexible SPC), ST2, and mW.<sup id="cite_ref-130" class="reference"><a href="#cite_note-130"><span class="cite-bracket">[</span>130<span class="cite-bracket">]</span></a></sup> Other solvents and methods of solvent representation are also applied within computational chemistry and physics; these are termed <a href="/wiki/Solvent_model" title="Solvent model">solvent models</a>. </p> <div class="mw-heading mw-heading3"><h3 id="Modified_amino_acids">Modified amino acids</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Force_field_(chemistry)&action=edit&section=16" title="Edit section: Modified amino acids"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20131203043233/http://selene.princeton.edu/FFPTM/">Forcefield_PTM</a> – An AMBER-based forcefield and webtool for modeling common post-translational modifications of amino acids in proteins developed by Chris Floudas and coworkers. It uses the ff03 charge model and has several side-chain torsion corrections parameterized to match the quantum chemical rotational surface.<sup id="cite_ref-131" class="reference"><a href="#cite_note-131"><span class="cite-bracket">[</span>131<span class="cite-bracket">]</span></a></sup></li> <li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20140106234603/http://selene.princeton.edu/FFNCAA/">Forcefield_NCAA</a> - An AMBER-based forcefield and webtool for modeling common non-natural amino acids in proteins in condensed-phase simulations using the ff03 charge model.<sup id="cite_ref-132" class="reference"><a href="#cite_note-132"><span class="cite-bracket">[</span>132<span class="cite-bracket">]</span></a></sup> The charges have been reported to be correlated with hydration free energies of corresponding side-chain analogs.<sup id="cite_ref-133" class="reference"><a href="#cite_note-133"><span class="cite-bracket">[</span>133<span class="cite-bracket">]</span></a></sup></li></ul> <div class="mw-heading mw-heading3"><h3 id="Other">Other</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Force_field_(chemistry)&action=edit&section=17" title="Edit section: Other"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>LFMM (Ligand Field Molecular Mechanics)<sup id="cite_ref-134" class="reference"><a href="#cite_note-134"><span class="cite-bracket">[</span>134<span class="cite-bracket">]</span></a></sup> - functions for the coordination sphere around transition metals based on the angular overlap model (AOM). Implemented in the Molecular Operating Environment (MOE) as DommiMOE and in <a href="/wiki/Tinker_(software)" title="Tinker (software)">Tinker</a><sup id="cite_ref-135" class="reference"><a href="#cite_note-135"><span class="cite-bracket">[</span>135<span class="cite-bracket">]</span></a></sup></li> <li><a href="/wiki/VALBOND" title="VALBOND">VALBOND</a> - a function for angle bending that is based on <a href="/wiki/Valence_bond_theory" title="Valence bond theory">valence bond theory</a> and works for large angular distortions, <a href="/wiki/Hypervalent_molecule" title="Hypervalent molecule">hypervalent molecules</a>, and <a href="/wiki/Complex_(chemistry)" class="mw-redirect" title="Complex (chemistry)">transition metal complexes</a>. It can be incorporated into other force fields such as CHARMM and UFF.</li></ul> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Force_field_(chemistry)&action=edit&section=18" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1184024115">.mw-parser-output .div-col{margin-top:0.3em;column-width:30em}.mw-parser-output .div-col-small{font-size:90%}.mw-parser-output .div-col-rules{column-rule:1px solid #aaa}.mw-parser-output .div-col dl,.mw-parser-output .div-col ol,.mw-parser-output .div-col ul{margin-top:0}.mw-parser-output .div-col li,.mw-parser-output .div-col dd{page-break-inside:avoid;break-inside:avoid-column}</style><div class="div-col" style="column-width: 30em;"> <ul><li><a href="/wiki/Comparison_of_force_field_implementations" class="mw-redirect" title="Comparison of force field implementations">Comparison of force field implementations</a></li> <li><a href="/wiki/Molecular_dynamics" title="Molecular dynamics">Molecular dynamics</a></li> <li><a href="/wiki/Molecular_mechanics" title="Molecular mechanics">Molecular mechanics</a></li> <li><a href="/wiki/Molecular_design_software" title="Molecular design software">Molecular design software</a></li> <li><a href="/wiki/Molecular_modelling" title="Molecular modelling">Molecular modelling</a></li> <li><a href="/wiki/Comparison_of_software_for_molecular_mechanics_modeling" title="Comparison of software for molecular mechanics modeling">Comparison of software for molecular mechanics modeling</a></li> <li><a href="/wiki/Statistical_potential" title="Statistical potential">Statistical potential</a></li> <li><a href="/wiki/Interatomic_potential" title="Interatomic potential">Interatomic potential</a></li> <li><a href="/wiki/Bond_order_potential" title="Bond order potential">Bond order potential</a></li> <li><a href="/wiki/Embedded_atom_model" title="Embedded atom model">Embedded atom model</a></li></ul></div> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Force_field_(chemistry)&action=edit&section=19" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist reflist-columns references-column-width" style="column-width: 30em;"> <ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFFrenkel2007" class="citation book cs1">Frenkel D (2007). <i>Understanding molecular simulation : from algorithms to applications</i>. Academic Press. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-12-267351-1" title="Special:BookSources/978-0-12-267351-1"><bdi>978-0-12-267351-1</bdi></a>. <a href="/wiki/OCLC_(identifier)" class="mw-redirect" title="OCLC (identifier)">OCLC</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/oclc/254835355">254835355</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Understanding+molecular+simulation+%3A+from+algorithms+to+applications&rft.pub=Academic+Press&rft.date=2007&rft_id=info%3Aoclcnum%2F254835355&rft.isbn=978-0-12-267351-1&rft.aulast=Frenkel&rft.aufirst=Daan&rfr_id=info%3Asid%2Fen.wikipedia.org%3AForce+field+%28chemistry%29" class="Z3988"></span></span> </li> <li id="cite_note-:1-2"><span class="mw-cite-backlink">^ <a href="#cite_ref-:1_2-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-:1_2-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFAbascalVega2005" class="citation journal cs1">Abascal JL, Vega C (December 2005). "A general purpose model for the condensed phases of water: TIP4P/2005". <i>The Journal of Chemical Physics</i>. <b>123</b> (23): 234505. <a href="/wiki/Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2005JChPh.123w4505A">2005JChPh.123w4505A</a>. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1063%2F1.2121687">10.1063/1.2121687</a>. <a href="/wiki/PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/16392929">16392929</a>. <a href="/wiki/S2CID_(identifier)" class="mw-redirect" title="S2CID (identifier)">S2CID</a> <a rel="nofollow" class="external text" href="https://api.semanticscholar.org/CorpusID:9757894">9757894</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=The+Journal+of+Chemical+Physics&rft.atitle=A+general+purpose+model+for+the+condensed+phases+of+water%3A+TIP4P%2F2005&rft.volume=123&rft.issue=23&rft.pages=234505&rft.date=2005-12&rft_id=info%3Adoi%2F10.1063%2F1.2121687&rft_id=https%3A%2F%2Fapi.semanticscholar.org%2FCorpusID%3A9757894%23id-name%3DS2CID&rft_id=info%3Apmid%2F16392929&rft_id=info%3Abibcode%2F2005JChPh.123w4505A&rft.aulast=Abascal&rft.aufirst=JL&rft.au=Vega%2C+C&rfr_id=info%3Asid%2Fen.wikipedia.org%3AForce+field+%28chemistry%29" class="Z3988"></span></span> </li> <li id="cite_note-:0-3"><span class="mw-cite-backlink">^ <a href="#cite_ref-:0_3-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-:0_3-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFSiuPluhackovaBöckmann2012" class="citation journal cs1">Siu SW, Pluhackova K, Böckmann RA (April 2012). 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San Diego: Academic Press. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-12-375181-2" title="Special:BookSources/978-0-12-375181-2"><bdi>978-0-12-375181-2</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Intermolecular+and+surface+forces&rft.place=San+Diego&rft.pub=Academic+Press&rft.date=1992&rft.isbn=978-0-12-375181-2&rft.aulast=Israelachvili&rft.aufirst=JN&rfr_id=info%3Asid%2Fen.wikipedia.org%3AForce+field+%28chemistry%29" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFSchlick2002" class="citation book cs1">Schlick T (2002). <i>Molecular Modeling and Simulation: An Interdisciplinary Guide</i>. Interdisciplinary Applied Mathematics: Mathematical Biology. New York: Springer-Verlag. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-387-95404-2" title="Special:BookSources/978-0-387-95404-2"><bdi>978-0-387-95404-2</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Molecular+Modeling+and+Simulation%3A+An+Interdisciplinary+Guide&rft.place=New+York&rft.series=Interdisciplinary+Applied+Mathematics%3A+Mathematical+Biology&rft.pub=Springer-Verlag&rft.date=2002&rft.isbn=978-0-387-95404-2&rft.aulast=Schlick&rft.aufirst=T&rfr_id=info%3Asid%2Fen.wikipedia.org%3AForce+field+%28chemistry%29" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFWarshel1991" class="citation book cs1">Warshel A (1991). <i>Computer Modeling of Chemical Reactions in Enzymes and Solutions</i>. New York: John Wiley & Sons. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-471-53395-5" title="Special:BookSources/978-0-471-53395-5"><bdi>978-0-471-53395-5</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Computer+Modeling+of+Chemical+Reactions+in+Enzymes+and+Solutions&rft.place=New+York&rft.pub=John+Wiley+%26+Sons&rft.date=1991&rft.isbn=978-0-471-53395-5&rft.aulast=Warshel&rft.aufirst=A&rfr_id=info%3Asid%2Fen.wikipedia.org%3AForce+field+%28chemistry%29" class="Z3988"></span></li></ul> </div> <div class="navbox-styles"><style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output .hlist li{margin:0;display:inline}.mw-parser-output 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href="/wiki/Template:Statistical_mechanics_topics" title="Template:Statistical mechanics topics"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Statistical_mechanics_topics" title="Template talk:Statistical mechanics topics"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Statistical_mechanics_topics" title="Special:EditPage/Template:Statistical mechanics topics"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Statistical_mechanics157" style="font-size:114%;margin:0 4em"><a href="/wiki/Statistical_mechanics" title="Statistical mechanics">Statistical mechanics</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">Theory</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Principle_of_maximum_entropy" title="Principle of maximum entropy">Principle of maximum entropy</a></li> <li><a href="/wiki/Ergodic_theory" title="Ergodic theory">ergodic theory</a></li></ul> </div></td><td class="noviewer navbox-image" rowspan="7" style="width:1px;padding:0 0 0 2px"><div><span typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/9c/Increasing_disorder.svg/150px-Increasing_disorder.svg.png" decoding="async" width="150" height="42" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/9c/Increasing_disorder.svg/225px-Increasing_disorder.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/9c/Increasing_disorder.svg/300px-Increasing_disorder.svg.png 2x" data-file-width="464" data-file-height="131" /></span></span></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Statistical_thermodynamics" class="mw-redirect" title="Statistical thermodynamics">Statistical thermodynamics</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Statistical_ensemble_(mathematical_physics)" class="mw-redirect" title="Statistical ensemble (mathematical physics)">Ensembles</a></li> <li><a href="/wiki/Partition_function_(statistical_mechanics)" title="Partition function (statistical mechanics)">partition functions</a></li> <li><a href="/wiki/Equation_of_state" title="Equation of state">equations of state</a></li> <li><a href="/wiki/Thermodynamic_potential" title="Thermodynamic potential">thermodynamic potential</a>: <ul><li><a href="/wiki/Internal_energy" title="Internal energy">U</a></li> <li><a href="/wiki/Enthalpy" title="Enthalpy">H</a></li> <li><a href="/wiki/Helmholtz_free_energy" title="Helmholtz free energy">F</a></li> <li><a href="/wiki/Gibbs_free_energy" title="Gibbs free energy">G</a></li></ul></li> <li><a href="/wiki/Maxwell_relations" title="Maxwell relations">Maxwell relations</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Statistical_model" title="Statistical model">Models</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Spin_model" title="Spin model">Ferromagnetism models</a> <ul><li><a href="/wiki/Ising_model" title="Ising model">Ising</a></li> <li><a href="/wiki/Potts_model" title="Potts model">Potts</a></li> <li><a href="/wiki/Heisenberg_model_(quantum)" class="mw-redirect" title="Heisenberg model (quantum)">Heisenberg</a></li> <li><a href="/wiki/Percolation_theory" title="Percolation theory">percolation</a></li></ul></li> <li>Particles with <a class="mw-selflink selflink">force field</a> <ul><li><a href="/wiki/Depletion_force" title="Depletion force">depletion force</a></li> <li><a href="/wiki/Lennard-Jones_potential" title="Lennard-Jones potential">Lennard-Jones potential</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Mathematical approaches</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Boltzmann_equation" title="Boltzmann equation">Boltzmann equation</a></li> <li><a href="/wiki/H-theorem" title="H-theorem">H-theorem</a></li> <li><a href="/wiki/Vlasov_equation" title="Vlasov equation">Vlasov equation</a></li> <li><a href="/wiki/BBGKY_hierarchy" title="BBGKY hierarchy">BBGKY hierarchy</a></li> <li><a href="/wiki/Stochastic_process" title="Stochastic process">stochastic process</a></li> <li><a href="/wiki/Mean-field_theory" title="Mean-field theory">mean-field theory</a> and <a href="/wiki/Conformal_field_theory" title="Conformal field theory">conformal field theory</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Critical_phenomena" title="Critical phenomena">Critical phenomena</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Phase_transition" title="Phase transition">Phase transition</a></li> <li><a href="/wiki/Critical_exponent" title="Critical exponent">Critical exponents</a> <ul><li><a href="/wiki/Correlation_function" title="Correlation function">correlation length</a></li> <li><a href="/wiki/Scaling_(geometry)" title="Scaling (geometry)">size scaling</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Entropy" title="Entropy">Entropy</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Boltzmann%27s_entropy_formula" title="Boltzmann's entropy formula">Boltzmann</a></li> <li><a href="/wiki/Shannon_entropy" class="mw-redirect" title="Shannon entropy">Shannon</a></li> <li><a href="/wiki/Tsallis_entropy" title="Tsallis entropy">Tsallis </a></li> <li><a href="/wiki/R%C3%A9nyi_entropy" title="Rényi entropy">Rényi</a></li> <li><a href="/wiki/Von_Neumann_entropy" title="Von Neumann entropy">von Neumann</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Applications</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Statistical_field_theory" title="Statistical field theory">Statistical field theory</a> <ul><li><a href="/wiki/Elementary_particle" title="Elementary particle">elementary particle</a></li> <li><a href="/wiki/Superfluidity" title="Superfluidity">superfluidity</a></li></ul></li> <li><a href="/wiki/Condensed_matter_physics" title="Condensed matter physics">Condensed matter physics</a></li> <li><a href="/wiki/Complex_system" title="Complex system">Complex system</a> <ul><li><a href="/wiki/Chaos_theory" title="Chaos theory">chaos</a></li> <li><a href="/wiki/Information_theory" title="Information theory">information theory</a></li> <li><a href="/wiki/Boltzmann_machine" title="Boltzmann machine">Boltzmann machine</a></li></ul></li></ul> </div></td></tr></tbody></table></div> <!-- NewPP limit report Parsed by mw‐web.codfw.main‐654b9d4bd7‐hcfhw Cached time: 20250210052400 Cache expiry: 2592000 Reduced expiry: false Complications: [vary‐revision‐sha1, show‐toc] CPU time usage: 1.441 seconds Real time usage: 1.639 seconds Preprocessor visited node count: 8069/1000000 Post‐expand include size: 377710/2097152 bytes Template argument size: 4353/2097152 bytes Highest expansion depth: 15/100 Expensive parser function count: 12/500 Unstrip recursion depth: 1/20 Unstrip post‐expand size: 561890/5000000 bytes Lua time usage: 0.960/10.000 seconds Lua memory usage: 7215463/52428800 bytes Number of Wikibase entities loaded: 0/400 --> <!-- Transclusion expansion time report (%,ms,calls,template) 100.00% 1369.723 1 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