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Silver clusters Ag L prepared either by the gas aggregation technique (GAT) or by matrix aggregation of Ag were embedded in CO and CO/Ar-matrices. The vibrational CO stretch frequency at the monolayer coverage, which is found on bulk silver at 2110 cm\, preserves its value with decreasing particle size, Ag L n5300. For smaller clusters a decrease of this frequency with decreasing size was observed. For the smallest investigated clusters Ag L , n:30, a value of 2080 cm\ was obtained. The weakening of the CO bond is an indication of a charge transfer from the cluster to the CO monolayer. This result is in accordance with the surface plasmon absorption measurements of Ag-clusters isolated in CO matrices.

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Small clusters of Group Ia, Ib, IIIa, IVa and Va homonuclear metals are measured in rare gas matrices. The results for Lix, Nax and Kx and problems concerning the identity of the species are discussed together with some theoretical predictions.

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