Abstract
The adsorption reactions of alkali-halide clusters have been investigated on a size-selected basis using flow-reactor methods. The reactivity of larger sodium-fluoride clusters [NanFn−1]+ toward polar molecules NH3 and H2O shows a distinctive pattern as a function ofn at ambient temperature. Comparison with computed structures shows that aparticular kind of defect greatly facilitates the initial adsorption process. This defect can be formed by removal of an ion-pair from the face of an otherwise perfect nanocrystal, to create a basket-like opening for the adsorbed molecule. It is shown that this kind of defect occurs as a most stable low-temperature structure only to a certain size, after which a less reactive defect takes its place. The implications of these findings for the adsorption reactivity of the surfaces of ionic solids are briefly discussed.
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Homer, M.L., Livingston, F.E. & Whetten, R.L. Adsorption reactions of alkali-halide nanocrystals: Identification of an important surface defect. Z Phys D - Atoms, Molecules and Clusters 26, 201–203 (1993). https://doi.org/10.1007/BF01429144
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DOI: https://doi.org/10.1007/BF01429144