Motion of small gold clusters in the electron microscope

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Abstract

The rapid motion of small (∼1000 atom) gold clusters observed with atomic resolution in the electron microscope is argued to be the result of brief melting events, triggered by the Auger decay of an M-shell vacancy created in a gold atom within the cluster. Each molten episode lasts ∼10 ps, too short for noticeable evaporation. The observed frequency of motion events is shown to be consistent with ionization cross sections for the gold M shell and the electron current densities employed. It is argued from the lack of observable evaporation that the steady-state temperature of the clusters is ≤1100 K, well below the melting point. The model correctly predicts the cessation of motion at a particle diameter ∼8 nm, when a single Auger decay can no longer melt the cluster.

Original languageEnglish (US)
Pages (from-to)1760-1762
Number of pages3
JournalApplied Physics Letters
Volume50
Issue number24
DOIs
StatePublished - Dec 1 1987

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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