/usr/share/gromacs/top/gmx.ff/ions.itp is in gromacs-data 4.5.5-2.
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 | [ 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
[ 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
[ moleculetype ]
; molname nrexcl
CA 1
[ atoms ]
; id at type res nr residu name at name cg nr charge
1 CA 1 CA CA 1 2
[ 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
[ 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
[ 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
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