Serra, LlorençGarcias, FranciscaBarranco Gómez, ManuelNavarro Faus, JesúsBalbás Ruesgas, Luis CarlosMañanes, A.2009-10-272009-10-2719890163-1829https://hdl.handle.net/2445/9832Using the once and thrice energy-weighted moments of the random-phase-approximation strength function, we have derived compact expressions for the average energy of surface collective oscillations of clusters and spheres of metal atoms. The L=0 volume mode has also been studied. We have carried out quantal and semiclassical calculations for Na and Ag systems in the spherical-jellium approximation. We present a rather thorough discussion of surface diffuseness and quantal size effects on the resonance energies.10 p.application/pdfeng(c) The American Physical Society, 1989Estructura atòmicaProcessos estocàsticsEstructura molecularAtomic structureMolecular structureStochastic processesinfo:eu-repo/semantics/article61539info:eu-repo/semantics/openAccess