Silicon cluster ions: Evidence for a structural transition

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Abstract
The mobilities of size-selected silicon cluster ions in helium have been measured using injected-ion drift-tube techniques. The results suggest that a major structural transition occurs for clusters with ∼27 atoms. Clusters with up to ∼27 atoms appear to follow a prolate growth sequence, resulting in geometries with an aspect ratio estimated to be ∼3. Larger clusters appear to have more spherical shapes. For annealed clusters this structural transition occurs over a narrow size range.