A close analogy is demonstrated between the optical and magnetic properties of alkali metal atoms solvated in a wide variety of media and those of excited alkali metal atoms in the gaseous phase. Developing this analogy one can show how the techniques of electron spin resonance (ESR) and optical spectroscopy, in conjunction with the trapping of excess electrons by solvated cations and anions, can be used to give a quantitative measure of ion-solvent interactions.
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Catterall et al. (1980) studied this question.