Abstract
Abstract Data analysis of inelastic neutron scattering experiments in 2.14M aqueous LiCl and CsCl solutions is presented. The diffusion parameters of hydration water molecules (residence time, diffusion coefficients) were extracted from the quasi-elastic component of the scattering law S(Q,ω). It was established that there are about four molecules in the hydration shell of a Li + ion, and their diffusion mobility is strongly hampered. A Cs + ion has about 8 molecules in its hydration shell, and this ion intensifies the diffusion motion of surrounding molecules. The dynamic hydration numbers were estimated: 3.7 for a Li + ion and ∼ 1 for a Cs + ion. The generalized frequency distributions for water molecules hydrating Li + and Cs + ions were obtained from the inelastic part of S(Q,ω). The effects observed indicate essential distortion of the hydrogen-bond (Hz.sbnd;B) network in the vicinity of both ions, but the character of this distortion has different physical natures.
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