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lammps/examples/USER/fep/CH4-CF4/mols/CH4-CF4.ff
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CH4-CF4.ff
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			# oplsaa.ff (kJ/mol, A, deg) version 2013/12/07

			ATOMS
			# type m/uma q/e pot pars
			# alkanes JACS 118(1996)11225, JPC 100(1996)18010
			C-CF CT 12.011 -0.24 lj 3.50 0.27614
			H-D HC 6.008 0.06 lj 2.50 0.12552
			HD- HC 6.008 0.00 lj 2.50 0.12552
			# perfluoroalkanes JPCA105:4118(2001)
			CF-C CT 12.011 0.48 lj 3.50 0.27614
			FD- F 18.998 0.00 lj 2.95 0.22175
			F-D F 18.998 -0.12 lj 2.95 0.22175

			BONDS
			# i j pot re/A ka/kJmol-1
			# alkanes OPLS-AA JACS 118(1996)11225, JPC 100(1996)18010
			HC CT harm 1.090 2845.12
			# perfluoroalkanes JPCA105(2001)4118
			F CT harm 1.332 3071.1

			ANGLES
			# i j k pot th/deg ka/kjmol-1
			# alkanes JACS 118(1996)11225, JPC 100(1996)18010
			HC CT HC harm 107.80 276.14
			# perfluorocarbons JPCA105(2001)4118
			F CT F harm 109.1 644.3
			# special
			HC CT F harm 0.0 0.0