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Observation of Large Water-Cluster Anions with Surface-Bound Excess Electrons

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Science  07 Jan 2005:
Vol. 307, Issue 5706, pp. 93-96
DOI: 10.1126/science.1106719

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Abstract

Anionic water clusters have long been studied to infer properties of the bulk hydrated electron. We used photoelectron imaging to characterize a class of (H2O)n and (D2O)n cluster anions (n ≤ 200 molecules) with vertical binding energies that are significantly lower than those previously recorded. The data are consistent with a structure in which the excess electron is bound to the surface of the cluster. This result implies that the excess electron in previously observed water-cluster anions, with higher vertical binding energies, was internally solvated. Thus, the properties of those clusters could be extrapolated to those of the bulk hydrated electron.

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