Static Polarizabilities of Charged Silver Metal Clusters Extracted from the Optical Spectra The use of sum rules appears to be a powerful tool for obtaining experimental data on static properties of charged metal clusters which are currently not available. For this purpose the optical spectra of the clusters must be known. The measured absorption profiles of sputtered, i.e. hot, and which have been measured in our group give information about the desired properties. The extracted static polarizabilities show a distinct shell structure which reflects the overall lectronic shape of the cluster. A comparison is made with AgN and positive alkali metal clusters. The polarizabilities of closed-shell and are in reasonable agreement with SIC-LDA corrected RPA polarizabilities. 3 1 509-513 509-513 World Scientific Publ.