<ForceField name="example_custom" version="0.0.1">
 <AtomTypes>
  <Type name="C1" class="c3" element="C" mass="12.011" def="C(C)(H)(F)(F)" desc="carbon bonded to 2 Fs, a H, and another carbon"/>
  <Type name="C2" class="c3" element="C" mass="12.011" def="C(C)(F)(F)(F)" desc="carbon bonded to 3 Fs and another carbon"/>
  <Type name="F1" class="f" element="F" mass="18.998" def="FC(C)(F)H" desc="F bonded to C1"/>
  <Type name="F2" class="f" element="F" mass="18.998" def="FC(C)(F)F" desc="F bonded to C2"/>
  <Type name="H1" class="h2" element="H" mass="1.008" def="H(C)" desc="single H bonded to C1"/>
 </AtomTypes>
 <HarmonicBondForce>
  <Bond class1="c3" class2="c3" length="0.15375" k="251793.12"/>
  <Bond class1="c3" class2="f" length="0.13497" k="298653.92"/>
  <Bond class1="c3" class2="h2" length="0.10961" k="277566.56"/>
 </HarmonicBondForce>
 <HarmonicAngleForce>
  <Angle class1="c3" class2="c3" class3="f" angle="1.9065976748786053" k="553.1248"/>
  <Angle class1="c3" class2="c3" class3="h2" angle="1.9237019015481498" k="386.6016"/>
  <Angle class1="f" class2="c3" class3="f" angle="1.8737854849411122" k="593.2912"/>
  <Angle class1="f" class2="c3" class3="h2" angle="1.898743693244631" k="427.6048"/>
 </HarmonicAngleForce>
 <PeriodicTorsionForce>
  <Proper class1="f" class2="c3" class3="c3" class4="f" periodicity1="3" k1="0.0" phase1="0.0" periodicity2="1" k2="5.0208" phase2="3.141592653589793"/>
  <Proper class1="" class2="c3" class3="c3" class4="" periodicity1="3" k1="0.6508444444444444" phase1="0.0"/>
 </PeriodicTorsionForce>
 <NonbondedForce coulomb14scale="0.833333" lj14scale="0.5">
  <Atom type="C1" charge="0.224067"  sigma="0.371084" epsilon="0.304665"/>
  <Atom type="C2" charge="0.500886"  sigma="0.393872" epsilon="0.222541"/>
  <Atom type="F1" charge="-0.167131" sigma="0.298239" epsilon="0.208221"/>
  <Atom type="F2" charge="-0.170758" sigma="0.276783" epsilon="0.237635"/>
  <Atom type="H1" charge="0.121583"  sigma="0.264229" epsilon="0.071381"/>
 </NonbondedForce>
</ForceField>
