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Science 14 January 2000:
Vol. 287. no. 5451, pp. 293 - 295
DOI: 10.1126/science.287.5451.293
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Reports

Formation of Cyclic Water Hexamer in Liquid Helium: The Smallest Piece of Ice

K. Nauta, R. E. Miller *

The cyclic water hexamer, a higher energy isomer than the cage structure previously characterized in the gas phase, was formed in liquid helium droplets and studied with infrared spectroscopy. This isomer is formed selectively as a result of unique cluster growth processes in liquid helium. The experimental results indicate that the cyclic hexamer is formed by insertion of water molecules into smaller preformed cyclic complexes and that the rapid quenching provided by the liquid helium inhibits its rearrangement to the more stable cage structure.

Department of Chemistry, University of North Carolina, Chapel Hill, NC 27599, USA.
*   To whom correspondence should be addressed. E-mail: remiller{at}unc.edu

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