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Mass spectra are presented for sodium clusters of N atoms per cluster (N=4-100) produced in a supersonic expansion with argon carrier gas. The spectra show large peaks or steps at N=8, 20, 40, 58, and 92. These can be understood in terms of a one-electron shell model in which independent delocalized atomic 3s electrons are bound in a spherically symmetric potential well.
Knight et al. (Mon,) studied this question.
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