Mass distributions and geometrical configurations of gold clusters (Au)n+ obtained in a hydrodynamic ion source

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Abstract The abundance mass spectra of gold clusters (Au)n+ up to n = 25 have been obtained using a hydrodynamic ion source. Two types of anomalies were observed: 1. an even—odd alternation in which the abundance of odd n clusters is greater than that of even n; 2. an intense ion current at n = 9, 13, 17, 21 and 25. We have obtained the cluster abundance mass spectra of gold produced by hydrodynamic ionization, compared it with those produced by secondary ionization methods, and discussed the correlation between the magic numbers and the geometrical structures of the aggregates. The irregularities in ion current at n = 9 and 21 are understood in terms of the electronic shell model, and those at n = 13, 17 and 25 are assumed to relate to energetically favoured geometrical configuration of the gold clusters.

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