/usr/share/gromacs/top/gmx.ff/tfe.itp is in gromacs-data 4.6.5-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 | [ moleculetype ]
; name nrexcl
TFE 1
[ atoms ]
; nr type resnr residu atom cgnr charge mass
#ifdef DeLoof
; Use Charges from De Loof
; De Loof et al., JACS 114, 1992, 4028-4035
1 C 1 TFE C 1 0.74
2 F 1 TFE F 1 -0.25
3 F 1 TFE F 1 -0.25
4 F 1 TFE F 1 -0.25
5 CH2 1 TFE CH2 1 0.25
6 OA 1 TFE OA 1 -0.65
7 HO 1 TFE HO 1 0.41
#else
; Use Charges from VanB
; Van Buuren & Berendsen, Biopolymers 33, 1993, 1159-1166
1 C 1 TFE C 1 0.59
2 F 1 TFE F 1 -0.2
3 F 1 TFE F 1 -0.2
4 F 1 TFE F 1 -0.2
5 CH2 1 TFE CH2 1 0.26
6 OA 1 TFE OA 1 -0.55
7 HO 1 TFE HO 1 0.3
#endif
[ bonds ]
; ai aj funct c0 c1
6 7 1 1.000000e-01 3.138000e+05
1 2 1 1.360000e-01 4.184000e+05
1 3 1 1.360000e-01 4.184000e+05
1 4 1 1.360000e-01 4.184000e+05
1 5 1 1.530000e-01 3.347000e+05
5 6 1 1.430000e-01 3.347000e+05
[ angles ]
; ai aj ak funct c0 c1
5 6 7 1 1.095000e+02 3.975000e+02
2 1 3 1 1.076000e+02 4.602000e+02
2 1 4 1 1.076000e+02 4.602000e+02
3 1 4 1 1.076000e+02 4.602000e+02
2 1 5 1 1.114000e+02 4.602000e+02
3 1 5 1 1.114000e+02 4.602000e+02
4 1 5 1 1.114000e+02 4.602000e+02
1 5 6 1 1.109000e+02 4.602000e+02
[ dihedrals ]
; ai aj ak al funct c0 c1 c2
1 5 6 7 1 0.000000e+00 1.255200e+00 3.000000e+00
2 1 5 6 1 0.000000e+00 4.184000e-01 6.000000e+00
3 1 5 6 1 0.000000e+00 4.184000e-01 6.000000e+00
4 1 5 6 1 0.000000e+00 4.184000e-01 6.000000e+00
[ exclusions ]
; i excluded from i
1 2 3 4 5 6
2 1 3 4 5
3 1 2 4 5
4 1 2 3 5
5 1 2 3 4 6 7
6 1 5 7
7 5 6
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