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Originally published in Science Express on 16 September 2004
Science 22 October 2004:
Vol. 306. no. 5696, pp. 675 - 679
DOI: 10.1126/science.1102792
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Reports

How Do Small Water Clusters Bind an Excess Electron?

Nathan I. Hammer, Joong-Won Shin, Jeffrey M. Headrick, Eric G. Diken, Joseph R. Roscioli, Gary H. Weddle,* Mark A. Johnson{dagger}

The arrangement of water molecules around a hydrated electron has eluded explanation for more than 40 years. Here we report sharp vibrational bands for small gas-phase water cluster anions, (H2O)4-6– and (D2O)4-6–. Analysis of these bands reveals a detailed picture of the diffuse electron-binding site. The electron is closely associated with a single water molecule attached to the supporting network through a double H-bond acceptor motif. The local OH stretching bands of this molecule are dramatically distorted in the pentamer and smaller clusters because the excited vibrational levels are strongly coupled to the electron continuum. The vibration–to–electronic energy transfer rates, as revealed by line shape analysis, are mode-specific and remarkably fast, with the symmetric stretching mode surviving for less than 10 vibrational periods [50 fs in (H2O)4–].

Sterling Chemistry Laboratory, Yale University, Post Office Box 208107, New Haven, CT 06520, USA.



* Present address: Department of Chemistry, Fairfield University, Fairfield, CT 06430, USA.

{dagger} To whom correspondence should be addressed. E-mail: mark.johnson{at}yale.edu

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Corrections and Clarifications.
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