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Deconstructing water’s diffuse OH stretching vibrational spectrum with cold clusters

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Science  19 Apr 2019:
Vol. 364, Issue 6437, pp. 275-278
DOI: 10.1126/science.aaw4086

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Wet surface sightings in clusters

In principle, the surface structure of water (H2O) should be discernable from the O–H vibrations. In practice, however, so many configurations rapidly interconvert that the bands are bewilderingly broad. Yang et al. studied a cluster of 20 H2O surrounding a cesium ion, using isotopomers that vary in the position of one H2O amid 19 heavy water (D2O) molecules. Precisely assigned spectral features from contributing configurations mapped well onto a bulk surface spectrum.

Science, this issue p. 275

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