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harmonic bonds harmonic angles opls dihedrals cvff impropers
OPLS-AA
FreeOptimized Potentials for Liquid Simulations — All-Atom. Class 1 force field with geometric combining rules and OPLS-style 4-term Fourier dihedrals.
Class 1
geometric mixing
1-4 LJ: 0.5
1-4 Coul: 0.5
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