High-resolution neutron quasi-elastic scattering has been applied to the problem of aqueous solutions. It is shown that for ions for which the primary hydration shell is in slow exchange with the remaining water, the frequently used two-state model is not appropriate. The experiments provide unambiguous evidence that the dynamics of water molecules other than those in the first shell are affected by the presence of ions.
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Hewish et al. (1983) studied this question.
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