/usr/share/gromacs/top/charmm27.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 | [ moleculetype ] ; added by Bjelkmar Jan 2010, from c32b1/toppar/stream/toppar_water_ions.str
; molname nrexcl
OH 1
[ atoms ]
; id at type res nr residu name at name cg nr charge mass
1 OC 1 OH O1 1 -1.32
2 H 1 OH H1 1 0.32
[ bonds ]
;i j funct length force.c.
1 2 1 0.09700 456056 ; hydroxyl bond
[ moleculetype ]
; molname nrexcl
NA 1
[ atoms ]
; id at type res nr residu name at name cg nr charge
1 SOD 1 NA NA 1 1
[ 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
K 1
[ atoms ]
; id at type res nr residu name at name cg nr charge
1 POT 1 K K 1 1
[ moleculetype ]
; molname nrexcl
CS 1
[ atoms ]
; id at type res nr residu name at name cg nr charge
1 CES 1 CS CS 1 1
[ moleculetype ]
; molname nrexcl
CA 1
[ atoms ]
; id at type res nr residu name at name cg nr charge
1 CAL 1 CA CA 1 2
[ moleculetype ]
; molname nrexcl
CL 1
[ atoms ]
; id at type res nr residu name at name cg nr charge
1 CLA 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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