Minimal Hydration

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Science  31 Mar 2000:
Vol. 287, Issue 5462, pp. 2373
DOI: 10.1126/science.287.5462.2373c

Scientists studying ion hydration often resort to investigating how just a few water molecules interact with the ion in the gas phase. In conjunction with theoretical studies, this approach can yield insights into the structure of the hydration shell and interactions in the condensed phase. Weber et al. (p. 2461; see the Perspective by Scoles and Lehmann) used cluster spectroscopy and ab initio theory to establish the detailed structure of the hydration shell around the superoxide anion, O2-. The minimum hydration shell involves just four water molecules, each of which is engaged in a single hydrogen bond to the superoxide.

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