Abstract
An experimental technique that produces, mass-resolves, and isolates both positive and negative cluster ions is described. Cluster ions of from 1 to greater than 50 atoms have been observed in carbon and silicon. This apparatus does not convert neutral clusters to ions via a secondary ionizing agent (e.g., laser photoionization or electron-impact ionization), but rather produces the cluster ions directly. Measurements of relative abundances of both positive and negative clusters (“magic numbers”) in carbon and silicon are presented. These results are compared to those obtained with conventional neutral cluster laser photoionization methods, and to spectra obtained using photofragmentation spectroscopy.
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