Infrared signature of structures associated with the H+(H2O)(n) (n=6 to 27) clusters. Shin, J., W., Hammer, N., I., Diken, E., G., Johnson, M., A., Walters, R., S., Jaeger, T., D., Duncan, M., A., Christie, R., A., & Jordan, K., D. Science, 304(5674):1137-1140, 2004.
Infrared signature of structures associated with the H+(H2O)(n) (n=6 to 27) clusters [pdf]Paper  Infrared signature of structures associated with the H+(H2O)(n) (n=6 to 27) clusters [link]Website  abstract   bibtex   
We report the OH stretching vibrational spectra of size-selected H+(H2O)(n) clusters through the region of the pronounced "magic number" at n = 21 in the cluster distribution. Sharp features are observed in the spectra and assigned to excitation of the dangling OH groups throughout the size range 6 less than or equal to n less than or equal to 27. A multiplet of such bands appears at small cluster sizes. This pattern simplifies to a doublet at n = 11, with the doublet persisting up to n = 20, but then collapsing to a single line in the n = 21 and n = 22 clusters and reemerging at n = 23. This spectral simplification provides direct evidence that, for the magic number cluster, all the dangling OH groups arise from water molecules in similar binding sites.

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