1+ <ForceField >
2+ <AtomTypes >
3+ <Type name =" tip4p-O" class =" OW" element =" O" mass =" 15.99943" />
4+ <Type name =" tip4p-H" class =" HW" element =" H" mass =" 1.007947" />
5+ <Type name =" tip4p-M" class =" MW" mass =" 0" />
6+ <Type name =" tip4p-L" class =" LW" mass =" 0" />
7+ </AtomTypes >
8+ <Residues >
9+ <Residue name =" HOH" >
10+ <Atom name =" O" type =" tip4p-O" />
11+ <Atom name =" H1" type =" tip4p-H" />
12+ <Atom name =" H2" type =" tip4p-H" />
13+ <Atom name =" M" type =" tip4p-M" />
14+ <Atom name =" L1" type =" tip4p-L" />
15+ <Atom name =" L2" type =" tip4p-L" />
16+ <VirtualSite type =" average3" index =" 3" atom1 =" 0" atom2 =" 1" atom3 =" 2" weight1 =" 1.023787149847e+00" weight2 =" -1.189357492343e-02" weight3 =" -1.189357492343e-02" parameterize =" weight1" parameter_eval =" weight2=0.5*(1.0-PARM['VirtualSite/weight1/HOH-3']), weight3=0.5*(1.0-PARM['VirtualSite/weight1/HOH-3'])" />
17+ <VirtualSite type =" average2" index =" 4" atom1 =" 0" atom2 =" 1" weight1 =" -5.235784773271e-03" weight2 =" 1.005235784773e+00" parameterize =" weight1" parameter_eval =" weight2=1.0-PARM['VirtualSite/weight1/HOH-4']" />
18+ <VirtualSite type =" average2" index =" 5" atom1 =" 0" atom2 =" 2" weight1 =" -5.235784773271e-03" weight2 =" 1.005235784773e+00" parameter_eval =" weight1=PARM['VirtualSite/weight1/HOH-4'], weight2=1.0-PARM['VirtualSite/weight1/HOH-4']" />
19+ <Bond from =" 0" to =" 1" />
20+ <Bond from =" 0" to =" 2" />
21+ </Residue >
22+ </Residues >
23+ <HarmonicBondForce >
24+ <Bond class1 =" OW" class2 =" HW" length =" 0.1" k =" 462750.4" />
25+ </HarmonicBondForce >
26+ <HarmonicAngleForce >
27+ <Angle class1 =" HW" class2 =" OW" class3 =" HW" angle =" 1.9106119321581925" k =" 836.8" />
28+ </HarmonicAngleForce >
29+ <NonbondedForce coulomb14scale =" 0.833333" lj14scale =" 0.5" >
30+ <Atom type =" tip4p-O" charge =" 0" sigma =" 1" epsilon =" 0" />
31+ <Atom type =" tip4p-H" charge =" 0" sigma =" 1" epsilon =" 0" />
32+ <Atom type =" tip4p-L" charge =" 4.234447011332e-01" sigma =" 1" epsilon =" 0" parameterize =" charge" />
33+ <Atom type =" tip4p-M" charge =" -8.468894022664e-01" sigma =" 3.178132992662e-01" epsilon =" 6.518502969140e-01" parameterize =" sigma, epsilon" parameter_eval =" charge=-2.0*PARM['Atom/charge/tip4p-L']" />
34+ </NonbondedForce >
35+ </ForceField >
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