The information gained on atomic motions in solids from studies of the isotope effect in diffusion1,2 prompted us to examine this effect in liquids, in particular for diffusion in water, because of its importance as a solvent. As isotope effect measurements for self-diffusion in water and deuterium oxide are available3, the isotope effect for 22Na and 24Na ions in water was studied. We describe here a new technique which applies to liquids the solid state technique of simultaneous diffusion4 of these isotopes followed by sectioning and half-life (or other suitable method) separation.
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Barr, L., Elmessiery, M. Isotope effects and correlated motion in self and sodium ion diffusion in water. Nature 281, 553–555 (1979). https://doi.org/10.1038/281553a0
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