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The main problems underlying the experimental study of particles with sizes between single atoms and the solid state have been solved: the formation of metal clusters, their individual detection, and the separation of beams with uniform cluster size. By inertgas condensation of metal vapors the clusters Sb₁-Sb₅₀₀, Bi₁-Bi₂₈₀, and Pb₁-Pb₄₀₀ have been produced. The high intensity observed over the whole mass range henceforth allows a systematic size-dependent investigation of metal clusters.
Sattler et al. (Mon,) studied this question.