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 exper imental data on static properties of charged metal clusters which are currently not available. For this purpose the optical spectra of the c lusters must be known. The measured absorption profiles or sputtered, i.e. hot, Ag-N(+) and Ag-N(-) which have been measured in our group gi ve information about the desired properties. The extracted static pola rizabilities show a distinct shell structure which reflects the overal l electronic shape of the cluster. A comparison is made with Ag-N and positive alkali metal clusters. The polarizabilities of closed-shell A g-N(+) and Ag-N(-) are in reasonable agreement with SIC-LDA corrected RPA polarizabilities.