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Published Online December 16, 2004
Science DOI: 10.1126/science.1106719

Reports

Submitted on October 25, 2004
Accepted on November 22, 2004

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

J. R. R. Verlet 1, A. E. Bragg 1, A. Kammrath 1, O. Cheshnovsky 2, D. M. Neumark 3*

1 Department of Chemistry, University of California, Berkeley, CA 94720 USA.
2 School of Chemistry, The Sacker Faculty of Exact Sciences, Tel-Aviv University, 69978 Israel.
3 Department of Chemistry, University of California, Berkeley, CA 94720 USA; Chemical Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720 USA.

* To whom correspondence should be addressed.
D. M. Neumark , E-mail: dneumark{at}berkeley.edu

Anionic water clusters have long been studied to infer properties of the bulk hydrated electron. Here we use photoelectron imaging to characterize a class of (H2O) n- and (D2O)n- cluster anions (n≤200) with vertical binding energies 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 previously observed water cluster anions, with higher vertical binding energies, were indeed from internally solvated electrons and are therefore structurally similar to a bulk hydrated electron.


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