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Science 24 October 1997:
Vol. 278. no. 5338, p. 549
DOI: 10.1126/science.278.5338.549f
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This Week in Science

Mid-infrared spectra of water can reveal the orientational dynamics of the OH groups of water, and by using fast laser pulses, the dynamics of the vibrational and orientational relaxation can be resolved for specific subensembles of water molecules. Woutersen et al. (p. 658) found that there are two distinct time scales for orientational relaxation in the liquid. While weakly hydrogen-bonded water molecules may relax through both the fast and the slow relaxation process, strongly hydrogen-bonded molecules can only relax via the slow process.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)