Neutron scattering experiments were performed on 6m LiCl solutions in order to obtain 
the solvation structure around the chloride ion. Molecular dynamics simulations on 
systems mirroring the concentrated electrolyte conditions of the experiment were carried 
out with a variety of chloride force fields. In each case the simulations were run with 
both full ionic charges and employing the electronic continuum correction (implemented 
through charge scaling) to account effectively for electronic polarization. The experimental 
data were then used to assess the successes and shortcomings of the investigated force fields. 
We found that due to the very good signal to noise ratio in the experimental data, they provide 
a very narrow window for the position of the first hydration shell of the chloride ion. This 
allowed us to establish the importance of effectively accounting for electronic polarization, 
as well as adjusting the ionic size, for obtaining a force field which compares quantitatively 
to the experimental data. The present results emphasize the utility of performing neutron 
diffraction with isotopic substitution as a powerful tool in gaining insight and examining 
the validity of force fields in concentrated electrolyte solutions.