<ForceField>
 <Info>
    <DateGenerated>2017-11-25</DateGenerated>
    <Source Source="parm/frcmod.ionsjc_tip4pew" md5hash="7aa9de49a8df5ebc45f74e1f47d13c2a" sourcePackage="AmberTools" sourcePackageVersion="17">parm/frcmod.ionsjc_tip4pew</Source>
    <Source Source="parm/frcmod.ions234lm_126_tip4pew" md5hash="3902b775a0fe5d42cab716a82c183747" sourcePackage="AmberTools" sourcePackageVersion="17">parm/frcmod.ions234lm_126_tip4pew</Source>
    <Source Source="lib/atomic_ions.lib" md5hash="e900cee0c71ec2795d25b3555de486e1" sourcePackage="AmberTools" sourcePackageVersion="17">lib/atomic_ions.lib</Source>
    <Source Source="tip4pew.xml" md5hash="cb450d015f4c238271cef8825f5ad7bd" sourcePackage="OpenMM" sourcePackageVersion="7.2">tip4pew.xml</Source>
    <Reference>Joung, I.S., and Cheatham, Thomas E. (2008). Determination of Alkali and Halide Monovalent Ion Parameters for Use in Explicitly Solvated Biomolecular Simulations. J. Phys. Chem. B 112, 9020-9041.</Reference>
    <Reference>Joung, I.S., and Cheatham, T.E. (2009). Molecular Dynamics Simulations of the Dynamic and Energetic Properties of Alkali and Halide Ions Using Water-Model-Specific Ion Parameters. J. Phys. Chem. B 113, 13279q13290.</Reference>
    <Reference>Li, P., Roberts, B.P., Chakravorty, D.K., and Merz, K.M. (2013). Rational Design of Particle Mesh Ewald Compatible Lennard-Jones Parameters for +2 Metal Cations in Explicit Solvent. J. Chem. Theory Comput. 9, 2733-2748.</Reference>
    <Reference>Horn, H.W., Swope, W.C., Pitera, J.W., Madura, J.D., Dick, T.J., Hura, G.L., and Head-Gordon, T. (2004). Development of an improved four-site water model for biomolecular simulations: TIP4P-Ew. The Journal of Chemical Physics 120, 9665-9678.</Reference>
    <Reference>Horn, H.W., Swope, W.C., and Pitera, J.W. (2005). Characterization of the TIP4P-Ew water model: Vapor pressure and boiling point. The Journal of Chemical Physics 123, 194504.</Reference>
  </Info>
  <AtomTypes>
  <Type class="tip4pew_standard-Li+" element="Li" mass="6.94" name="tip4pew_standard-Li+"/>
    <Type class="tip4pew_standard-Na+" element="Na" mass="22.99" name="tip4pew_standard-Na+"/>
    <Type class="tip4pew_standard-K+" element="K" mass="39.1" name="tip4pew_standard-K+"/>
    <Type class="tip4pew_standard-Rb+" element="Rb" mass="85.47" name="tip4pew_standard-Rb+"/>
    <Type class="tip4pew_standard-Cs+" element="Cs" mass="132.91" name="tip4pew_standard-Cs+"/>
    <Type class="tip4pew_standard-F-" element="F" mass="19.0" name="tip4pew_standard-F-"/>
    <Type class="tip4pew_standard-Cl-" element="Cl" mass="35.45" name="tip4pew_standard-Cl-"/>
    <Type class="tip4pew_standard-Br-" element="Br" mass="79.9" name="tip4pew_standard-Br-"/>
    <Type class="tip4pew_standard-I-" element="I" mass="126.9" name="tip4pew_standard-I-"/>
    <Type class="tip4pew_standard-Be2+" element="Be" mass="9.01" name="tip4pew_standard-Be2+"/>
    <Type class="tip4pew_standard-Cu2+" element="Cu" mass="63.55" name="tip4pew_standard-Cu2+"/>
    <Type class="tip4pew_standard-Ni2+" element="Ni" mass="58.69" name="tip4pew_standard-Ni2+"/>
    <Type class="tip4pew_standard-Pt2+" element="Pt" mass="195.08" name="tip4pew_standard-Pt2+"/>
    <Type class="tip4pew_standard-Zn2+" element="Zn" mass="65.4" name="tip4pew_standard-Zn2+"/>
    <Type class="tip4pew_standard-Co2+" element="Co" mass="58.93" name="tip4pew_standard-Co2+"/>
    <Type class="tip4pew_standard-Pd2+" element="Pd" mass="106.42" name="tip4pew_standard-Pd2+"/>
    <Type class="tip4pew_standard-Ag2+" element="Ag" mass="107.87" name="tip4pew_standard-Ag2+"/>
    <Type class="tip4pew_standard-Cr2+" element="Cr" mass="52.0" name="tip4pew_standard-Cr2+"/>
    <Type class="tip4pew_standard-Fe2+" element="Fe" mass="55.85" name="tip4pew_standard-Fe2+"/>
    <Type class="tip4pew_standard-Mg2+" element="Mg" mass="24.305" name="tip4pew_standard-Mg2+"/>
    <Type class="tip4pew_standard-V2+" element="V" mass="50.94" name="tip4pew_standard-V2+"/>
    <Type class="tip4pew_standard-Mn2+" element="Mn" mass="54.94" name="tip4pew_standard-Mn2+"/>
    <Type class="tip4pew_standard-Hg2+" element="Hg" mass="200.59" name="tip4pew_standard-Hg2+"/>
    <Type class="tip4pew_standard-Cd2+" element="Cd" mass="112.41" name="tip4pew_standard-Cd2+"/>
    <Type class="tip4pew_standard-Yb2+" element="Yb" mass="173.05" name="tip4pew_standard-Yb2+"/>
    <Type class="tip4pew_standard-Ca2+" element="Ca" mass="40.08" name="tip4pew_standard-Ca2+"/>
    <Type class="tip4pew_standard-Sn2+" element="Sn" mass="118.71" name="tip4pew_standard-Sn2+"/>
    <Type class="tip4pew_standard-Pb2+" element="Pb" mass="207.2" name="tip4pew_standard-Pb2+"/>
    <Type class="tip4pew_standard-Eu2+" element="Eu" mass="151.96" name="tip4pew_standard-Eu2+"/>
    <Type class="tip4pew_standard-Sr2+" element="Sr" mass="87.62" name="tip4pew_standard-Sr2+"/>
    <Type class="tip4pew_standard-Sm2+" element="Sm" mass="150.36" name="tip4pew_standard-Sm2+"/>
    <Type class="tip4pew_standard-Ba2+" element="Ba" mass="137.33" name="tip4pew_standard-Ba2+"/>
    <Type class="tip4pew_standard-Ra2+" element="Ra" mass="226.03" name="tip4pew_standard-Ra2+"/>
    <Type class="tip4pew_standard-Al3+" element="Al" mass="26.98" name="tip4pew_standard-Al3+"/>
    <Type class="tip4pew_standard-Fe3+" element="Fe" mass="55.85" name="tip4pew_standard-Fe3+"/>
    <Type class="tip4pew_standard-Cr3+" element="Cr" mass="52.0" name="tip4pew_standard-Cr3+"/>
    <Type class="tip4pew_standard-In3+" element="In" mass="114.82" name="tip4pew_standard-In3+"/>
    <Type class="tip4pew_standard-Tl3+" element="Tl" mass="204.38" name="tip4pew_standard-Tl3+"/>
    <Type class="tip4pew_standard-Y3+" element="Y" mass="88.91" name="tip4pew_standard-Y3+"/>
    <Type class="tip4pew_standard-La3+" element="La" mass="138.91" name="tip4pew_standard-La3+"/>
    <Type class="tip4pew_standard-Ce3+" element="Ce" mass="140.12" name="tip4pew_standard-Ce3+"/>
    <Type class="tip4pew_standard-Pr3+" element="Pr" mass="140.91" name="tip4pew_standard-Pr3+"/>
    <Type class="tip4pew_standard-Nd3+" element="Nd" mass="144.24" name="tip4pew_standard-Nd3+"/>
    <Type class="tip4pew_standard-Sm3+" element="Sm" mass="150.36" name="tip4pew_standard-Sm3+"/>
    <Type class="tip4pew_standard-Eu3+" element="Eu" mass="151.96" name="tip4pew_standard-Eu3+"/>
    <Type class="tip4pew_standard-Gd3+" element="Gd" mass="157.25" name="tip4pew_standard-Gd3+"/>
    <Type class="tip4pew_standard-Tb3+" element="Tb" mass="158.93" name="tip4pew_standard-Tb3+"/>
    <Type class="tip4pew_standard-Dy3+" element="Dy" mass="162.5" name="tip4pew_standard-Dy3+"/>
    <Type class="tip4pew_standard-Er3+" element="Er" mass="167.26" name="tip4pew_standard-Er3+"/>
    <Type class="tip4pew_standard-Tm3+" element="Tm" mass="168.93" name="tip4pew_standard-Tm3+"/>
    <Type class="tip4pew_standard-Lu3+" element="Lu" mass="174.97" name="tip4pew_standard-Lu3+"/>
    <Type class="tip4pew_standard-Hf4+" element="Hf" mass="178.49" name="tip4pew_standard-Hf4+"/>
    <Type class="tip4pew_standard-Zr4+" element="Zr" mass="91.22" name="tip4pew_standard-Zr4+"/>
    <Type class="tip4pew_standard-Ce4+" element="Ce" mass="140.12" name="tip4pew_standard-Ce4+"/>
    <Type class="tip4pew_standard-U4+" element="U" mass="238.03" name="tip4pew_standard-U4+"/>
    <Type class="tip4pew_standard-Pu4+" element="Pu" mass="244.06" name="tip4pew_standard-Pu4+"/>
    <Type class="tip4pew_standard-Th4+" element="Th" mass="232.04" name="tip4pew_standard-Th4+"/>
   <Type name="tip4pew-O" class="tip4pew-O" element="O" mass="15.99943"/>
  <Type name="tip4pew-H" class="tip4pew-H" element="H" mass="1.007947"/>
  <Type name="tip4pew-M" class="tip4pew-M" mass="0"/>
 </AtomTypes>
 <Residues>
  <Residue name="AL">
      <Atom charge="3.0" name="AL" type="tip4pew_standard-Al3+"/>
    </Residue>
    <Residue name="Ag">
      <Atom charge="2.0" name="Ag" type="tip4pew_standard-Ag2+"/>
    </Residue>
    <Residue name="BA">
      <Atom charge="2.0" name="BA" type="tip4pew_standard-Ba2+"/>
    </Residue>
    <Residue name="BR">
      <Atom charge="-1.0" name="BR" type="tip4pew_standard-Br-"/>
    </Residue>
    <Residue name="Be">
      <Atom charge="2.0" name="Be" type="tip4pew_standard-Be2+"/>
    </Residue>
    <Residue name="CA">
      <Atom charge="2.0" name="CA" type="tip4pew_standard-Ca2+"/>
    </Residue>
    <Residue name="CD">
      <Atom charge="2.0" name="CD" type="tip4pew_standard-Cd2+"/>
    </Residue>
    <Residue name="CE">
      <Atom charge="3.0" name="CE" type="tip4pew_standard-Ce3+"/>
    </Residue>
    <Residue name="CL">
      <Atom charge="-1.0" name="CL" type="tip4pew_standard-Cl-"/>
    </Residue>
    <Residue name="CO">
      <Atom charge="2.0" name="CO" type="tip4pew_standard-Co2+"/>
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    <Residue name="CR">
      <Atom charge="3.0" name="CR" type="tip4pew_standard-Cr3+"/>
    </Residue>
    <Residue name="CS">
      <Atom charge="1.0" name="CS" type="tip4pew_standard-Cs+"/>
    </Residue>
    <Residue name="CU">
      <Atom charge="2.0" name="CU" type="tip4pew_standard-Cu2+"/>
    </Residue>
    <Residue name="Ce">
      <Atom charge="4.0" name="Ce" type="tip4pew_standard-Ce4+"/>
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    <Residue name="Cr">
      <Atom charge="2.0" name="Cr" type="tip4pew_standard-Cr2+"/>
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    <Residue name="Dy">
      <Atom charge="3.0" name="Dy" type="tip4pew_standard-Dy3+"/>
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    <Residue name="EU">
      <Atom charge="2.0" name="EU" type="tip4pew_standard-Eu2+"/>
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    <Residue name="EU3">
      <Atom charge="3.0" name="EU3" type="tip4pew_standard-Eu3+"/>
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    <Residue name="Er">
      <Atom charge="3.0" name="Er" type="tip4pew_standard-Er3+"/>
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    <Residue name="F">
      <Atom charge="-1.0" name="F" type="tip4pew_standard-F-"/>
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    <Residue name="FE">
      <Atom charge="3.0" name="FE" type="tip4pew_standard-Fe3+"/>
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    <Residue name="FE2">
      <Atom charge="2.0" name="FE2" type="tip4pew_standard-Fe2+"/>
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    <Residue name="GD3">
      <Atom charge="3.0" name="GD" type="tip4pew_standard-Gd3+"/>
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    <Residue name="HG">
      <Atom charge="2.0" name="HG" type="tip4pew_standard-Hg2+"/>
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    <Residue name="Hf">
      <Atom charge="4.0" name="Hf" type="tip4pew_standard-Hf4+"/>
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    <Residue name="IN">
      <Atom charge="3.0" name="IN" type="tip4pew_standard-In3+"/>
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    <Residue name="IOD">
      <Atom charge="-1.0" name="I" type="tip4pew_standard-I-"/>
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    <Residue name="K">
      <Atom charge="1.0" name="K" type="tip4pew_standard-K+"/>
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    <Residue name="LA">
      <Atom charge="3.0" name="LA" type="tip4pew_standard-La3+"/>
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    <Residue name="LI">
      <Atom charge="1.0" name="LI" type="tip4pew_standard-Li+"/>
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    <Residue name="LU">
      <Atom charge="3.0" name="LU" type="tip4pew_standard-Lu3+"/>
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    <Residue name="MG">
      <Atom charge="2.0" name="MG" type="tip4pew_standard-Mg2+"/>
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    <Residue name="MN">
      <Atom charge="2.0" name="MN" type="tip4pew_standard-Mn2+"/>
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    <Residue name="NA">
      <Atom charge="1.0" name="NA" type="tip4pew_standard-Na+"/>
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    <Residue name="NI">
      <Atom charge="2.0" name="NI" type="tip4pew_standard-Ni2+"/>
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    <Residue name="Nd">
      <Atom charge="3.0" name="Nd" type="tip4pew_standard-Nd3+"/>
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    <Residue name="PB">
      <Atom charge="2.0" name="PB" type="tip4pew_standard-Pb2+"/>
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    <Residue name="PD">
      <Atom charge="2.0" name="PD" type="tip4pew_standard-Pd2+"/>
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    <Residue name="PR">
      <Atom charge="3.0" name="PR" type="tip4pew_standard-Pr3+"/>
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    <Residue name="PT">
      <Atom charge="2.0" name="PT" type="tip4pew_standard-Pt2+"/>
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    <Residue name="Pu">
      <Atom charge="4.0" name="Pu" type="tip4pew_standard-Pu4+"/>
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    <Residue name="RB">
      <Atom charge="1.0" name="RB" type="tip4pew_standard-Rb+"/>
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    <Residue name="Ra">
      <Atom charge="2.0" name="Ra" type="tip4pew_standard-Ra2+"/>
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    <Residue name="SM">
      <Atom charge="3.0" name="SM" type="tip4pew_standard-Sm3+"/>
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    <Residue name="SR">
      <Atom charge="2.0" name="SR" type="tip4pew_standard-Sr2+"/>
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    <Residue name="Sm">
      <Atom charge="2.0" name="Sm" type="tip4pew_standard-Sm2+"/>
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    <Residue name="Sn">
      <Atom charge="2.0" name="Sn" type="tip4pew_standard-Sn2+"/>
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    <Residue name="TB">
      <Atom charge="3.0" name="TB" type="tip4pew_standard-Tb3+"/>
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      <Atom charge="4.0" name="Th" type="tip4pew_standard-Th4+"/>
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    <Residue name="Tl">
      <Atom charge="3.0" name="Tl" type="tip4pew_standard-Tl3+"/>
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    <Residue name="Tm">
      <Atom charge="3.0" name="Tm" type="tip4pew_standard-Tm3+"/>
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    <Residue name="U4+">
      <Atom charge="4.0" name="U" type="tip4pew_standard-U4+"/>
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    <Residue name="V2+">
      <Atom charge="2.0" name="V2+" type="tip4pew_standard-V2+"/>
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      <Atom charge="4.0" name="Zr" type="tip4pew_standard-Zr4+"/>
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   <Residue name="HOH">
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   <Atom name="H1" type="tip4pew-H" charge="0.52422"/>
   <Atom name="H2" type="tip4pew-H" charge="0.52422"/>
   <Atom name="M" type="tip4pew-M" charge="-1.04844"/>
   <VirtualSite type="average3" siteName="M" atomName1="O" atomName2="H1" atomName3="H2" weight1="0.786646558" weight2="0.106676721" weight3="0.106676721"/>
   <Bond atomName1="O" atomName2="H1"/>
   <Bond atomName1="O" atomName2="H2"/>
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 </Residues>
 <HarmonicBondForce>
  <Bond type1="tip4pew-O" type2="tip4pew-H" length="0.09572" k="462750.4"/>
 </HarmonicBondForce>
 <HarmonicAngleForce>
  <Angle type1="tip4pew-H" type2="tip4pew-O" type3="tip4pew-H" angle="1.82421813418" k="836.8"/>
 </HarmonicAngleForce>
 <NonbondedForce coulomb14scale="0.8333333333333334" lj14scale="0.5">
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    <Atom epsilon="0.43830358088" sigma="0.29346203775542773" type="tip4pew_standard-Sm3+"/>
    <Atom epsilon="0.4580931896" sigma="0.29488747570445234" type="tip4pew_standard-Eu3+"/>
    <Atom epsilon="0.35748949536" sigma="0.2872257467284454" type="tip4pew_standard-Gd3+"/>
    <Atom epsilon="0.37289213824" sigma="0.28847300493384187" type="tip4pew_standard-Tb3+"/>
    <Atom epsilon="0.32577870832" sigma="0.28455305057402436" type="tip4pew_standard-Dy3+"/>
    <Atom epsilon="0.31158691504" sigma="0.2833057923686279" type="tip4pew_standard-Er3+"/>
    <Atom epsilon="0.31158691504" sigma="0.2833057923686279" type="tip4pew_standard-Tm3+"/>
    <Atom epsilon="0.28625681168" sigma="0.280989455701463" type="tip4pew_standard-Lu3+"/>
    <Atom epsilon="0.14196839183999999" sigma="0.26424055980042466" type="tip4pew_standard-Hf4+"/>
    <Atom epsilon="0.16712607256" sigma="0.26780415467298596" type="tip4pew_standard-Zr4+"/>
    <Atom epsilon="0.48867542632000005" sigma="0.29702563262798914" type="tip4pew_standard-Ce4+"/>
    <Atom epsilon="0.48867542632000005" sigma="0.29702563262798914" type="tip4pew_standard-U4+"/>
    <Atom epsilon="0.43343181496" sigma="0.29310567826817163" type="tip4pew_standard-Pu4+"/>
    <Atom epsilon="0.5502288444000001" sigma="0.3011237667314347" type="tip4pew_standard-Th4+"/>
   <Atom type="tip4pew-O" sigma="0.316435" epsilon="0.680946"/>
  <Atom type="tip4pew-H" sigma="1" epsilon="0"/>
  <Atom type="tip4pew-M" sigma="1" epsilon="0"/>
 </NonbondedForce>
</ForceField>