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An algebraic method especially suited to describe strongly anharmonicvibrational spectra in molecules may be an appropriate framework to studyvibrational spectra of Na$^+_n$ clusters, where nearly flat potential energysurfaces and the appearance of close lying isomers have been reported. As anillustration we describe the model and apply it to the Be$_4$, H$_3^+$, Be$_3$and Na$_3^+$ clusters.Comment: 8 pages with 2 tables, invited talk at `Atomic Nuclei & Metallic  Clusters: Finite Many-Fermion Systems', Prague, Czech Republic, September  1-5, 199

A symmetry adapted approach to vibrational excitations in atomic clusters