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The optical response of the lowest energy members of the C20 family iscalculated using time-dependent density functional theory within a real-space,real-time scheme. Significant differences are found among the spectra of thedifferent isomers, and thus we propose optical spectroscopy as a tool forexperimental investigation of the structure of these important clusters.Comment: 11 pages, 2 figures. To be published in J. Chem. Phy

Can optical spectroscopy directly elucidate the ground state of C20?