Phys. Rev. Lett. 67, 2994–2997 (1991)Silicon cluster ions: Evidence for a structural transitionReceived 26 July 1991; published in the issue dated 18 November 1991 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. © 1991 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.67.2994
DOI:
10.1103/PhysRevLett.67.2994
PACS:
61.50.Lt, 36.40.+d
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