THE CHARGE STRUCTURE FACTOR OF A 1-1 ELECTROLYTE IN SOLUTION

The charge structure factor of a 1-1 electrolyte solution has been measured by means of small angle neutron scattering. To this end the system was chosen so as to achieve a zero average contrast for the salt. The data are used to test the Stillinger and Lovett sum rules, and also to test the modelization of the solution structure including short range as well as Coulombic interactions. This modelization is based on the hypernetted chain integral equation and on suitable solvent-averaged pair potentials. At small values of wave number transfer, the experimental results are compared to a new approximation for the charge structure factor.