Abstract
The properties of clusters investigated, combined with the work of others, indicate that (a) the reactivity of metal clusters toward adsorbate may show very dramatic size dependence, (b) the spectra of adsorbates on small clusters may differ markedly from those on single-crystal surfaces, (c) certain collective phenomena may contribute in subtle ways to the observed frequencies, intensities, and bandwidths of spectra of molecules, (d) the geometries of small clusters are often different from the bulk. The gross features of the chemisorptive bond, as well as that between a molecule and a very small cluster, are adequately described by a local bond. However, the chemistry and the spectroscopy may respond to subtle effects. Catalysis by small, supported-metal aggregates will in general be different from that by stable cluster complexes as a result of the existence of many metastable structures for the bare cluster. 6 figures.
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