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Science 5 August 2005:
Vol. 309. no. 5736, p. 847
DOI: 10.1126/science.309.5736.847m
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This Week in Science
Charged water clusters have been used as experimental models to study bulk hydrated electrons, which are implicated in radiation damage and other reductive processes. However, researchers have wondered whether the clusters bind excess electrons at the surface or encapsulate them in a cavity more analogous to the bulk structure. Turi et al. (p. 914) have simulated anionic clusters ranging in size from 20 to 200 water molecules, with the water treated classically and the excess electron quantum mechanically. They find that below 200 water molecules, the surface-bound state predominates, and the calculated variations of the electron's absorption spectrum, kinetic energy, and radius with cluster size match those observed experimentally. It appears, therefore, that the experimental small cluster studies have involved surface-bound electrons.
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Science. ISSN 0036-8075 (print), 1095-9203 (online)
