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Science 5 January 1996:
Vol. 271. no. 5245, pp. 59 - 62
DOI: 10.1126/science.271.5245.59
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Reports

Quantifying Hydrogen Bond Cooperativity in Water: VRT Spectroscopy of the Water Tetramer

J. D. Cruzan,  L. B. Braly,  Kun Liu,  M. G. Brown,  J. G. Loeser,  R. J . Saykally (1)

Measurement of the far-infrared vibration-rotation tunneling spectrum of the perdeuterated water tetramer is described. Precisely determined rotational constants and relative intensity measurements indicate a cyclic quasi-planar minimum energy structure, which is in agreement with recent ab initio calculations. The O-O separation deduced from the data indicates a rapid exponential convergence to the ordered bulk value with increasing cluster size. Observed quantum tunneling splittings are interpreted in terms of hydrogen bond rearrangements connecting two degenerate structures.


Department of Chemistry, University of California at Berkeley, Berkeley, CA 94720, USA.
(1) To whom correspondence should be addressed.


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