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We deduce the evolution of electronic excitations in Kr clusters (N=2−3000) from fluorescence excitation spectroscopy with synchrotron radiation. In small clusters (N≤30), a broad absorption band appears, slightly red shifted compared with the atomic 5s($\dfrac {3}{2})_1$ resonance line. Intermediate-size clusters (50$<$N$≤$200) show absorption profiles which are mainly correlated with the surface excitons of the solid. The bulk excitons are pronounced only in large clusters (N≥200). Absorption processes at the surface and inside the cluster correlate well to the surface-to-volume ratio of the cluster

Evolution of Electronic Energy Levels in Krypton Clusters from the Atom to the Solid