OPLS-AA Water TIP3P Forcefield file

tip3p.xml

<ForceField>
 <AtomTypes>
  <Type name="tip3p-O" class="OW" element="O" mass="15.99943"/>
  <Type name="tip3p-H" class="HW" element="H" mass="1.007947"/>
 </AtomTypes>
 <Residues>
  <Residue name="HOH">
   <Atom name="O" type="tip3p-O"/>
   <Atom name="H1" type="tip3p-H"/>
   <Atom name="H2" type="tip3p-H"/>
   <Bond from="0" to="1"/>
   <Bond from="0" to="2"/>
  </Residue>
 </Residues>
 <HarmonicBondForce>
  <Bond class1="OW" class2="HW" length="0.09572" k="462750.4"/>
 </HarmonicBondForce>
 <HarmonicAngleForce>
  <Angle class1="HW" class2="OW" class3="HW" angle="1.82421813418" k="836.8"/>
 </HarmonicAngleForce>
 <NonbondedForce coulomb14scale="0.5" lj14scale="0.5">
  <Atom type="tip3p-O" charge="-0.834" sigma="0.31507524065751241" epsilon="0.635968"/>
  <Atom type="tip3p-H" charge="0.417" sigma="1" epsilon="0"/>
 </NonbondedForce>
</ForceField>