Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 122, Issue 19, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1899583
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The existence of a transitional size regime where preferential stabilization alternates between all-surface (all atoms on the surface of a cluster) and internally solvated (one water molecule at the center of the cluster, fully solvated) configurations with the addition or the removal of a single water molecule, predicted earlier with the flexible, polarizable (many-body) Thole-type model interaction potential (TTM2-F), has been confirmed from electronic structure calculations for (H2O)(n), n=17-21. The onset of the appearance of the first interior configuration in water clusters occurs for n=17. The observed structural alternation between interior (n=17, 19, 21) and all-surface (n=18, 20) global minima in the n=17-21 cluster regime is accompanied by a corresponding spectroscopic signature, namely, the undulation in the position of the most redshifted OH stretching vibrations according to the trend: interior configurations exhibit more redshifted OH stretching vibrations than all-surface ones. These most redshifted OH stretching vibrations form distinct groups in the intramolecular region of the spectra and correspond to localized vibrations of donor OH stretches that are connected to neighbors via strong (water dimer-like) hydrogen bonds,and belong to a water molecule with a free OH stretch. (c) 2005 American Institute of Physics.
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