/usr/share/gromacs/top/amber99.ff/ions.itp is in gromacs-data 2018.1-1.
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 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 | [ moleculetype ]
; molname nrexcl
IB+ 1 ; big positive ion
[ atoms ]
; id at type res nr residu name at name cg nr charge
1 IB 1 IB+ IB 1 1.00000
[ moleculetype ]
; molname nrexcl
CA 1
[ atoms ]
; id at type res nr residu name at name cg nr charge
1 C0 1 CA CA 1 2.00000
[ moleculetype ]
; molname nrexcl
CL 1
[ atoms ]
; id at type res nr residu name at name cg nr charge
1 Cl 1 CL CL 1 -1.00000
[ moleculetype ]
; molname nrexcl
NA 1
[ atoms ]
; id at type res nr residu name at name cg nr charge
1 Na 1 NA NA 1 1.00000
[ moleculetype ]
; molname nrexcl
MG 1
[ atoms ]
; id at type res nr residu name at name cg nr charge
1 MG 1 MG MG 1 2.00000
[ moleculetype ]
; molname nrexcl
K 1
[ atoms ]
; id at type res nr residu name at name cg nr charge
1 K 1 K K 1 1.00000
[ moleculetype ]
; molname nrexcl
RB 1
[ atoms ]
; id at type res nr residu name at name cg nr charge
1 Rb 1 RB RB 1 1.00000
[ moleculetype ]
; molname nrexcl
CS 1
[ atoms ]
; id at type res nr residu name at name cg nr charge
1 Cs 1 CS CS 1 1.00000
[ moleculetype ]
; molname nrexcl
LI 1
[ atoms ]
; id at type res nr residu name at name cg nr charge
1 Li 1 LI LI 1 1.00000
[ moleculetype ]
; molname nrexcl
ZN 1
[ atoms ]
; id at type res nr residu name at name cg nr charge
1 Zn 1 ZN ZN 1 2.00000
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