The evolution of Wannier excitons in free argon clusters is investigated using fluorescence excitation spectroscopy with synchrotron-radiation excitation. The energetic positions of the absorption bands are analyzed as a function of the cluster size from their appearance in small clusters up to the solid-state limit in crystallites with a radius R{}200 {}. A three- and two-dimensional confinement of bulk and surface states is observed.
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Wörmer et al. (1991) studied this question.
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