[gmx-users] forcefield parameter for bromide ion

[jagannath mondal]

Hi
  I need to do a simulation of protein in presence of LiBr salt solution.
However, I am not finding any force field parameters for bromide ion either
in charmm forcefields or amber forcefields. Can someone suggest a decent
source for bromide ion forcefield parameters that one could employ in
simulation involving protein.
Jagannath