Copper clusters containing twondash;five atoms and large colloidal particles of copper were formed within matrices by cohyphen;condensing metal vapor with argon, methane, and dodecane onto a lowhyphen;temperature substrate. The electronic absorption spectra of the resulting solids were recorded and absorptions belonging to individual aggregates of copper identified using a previously published calculation which predicts the cluster distribution within matrices of given metalhyphen;tohyphen;host ratios. The rsquo;rsquo;birthrsquo;rsquo; of the band structure of copper is clearly visible on going from the dimer upward, with Cu4already possessing many of the features of the bulk metal.
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