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Related Experiment Videos

Origin of atomic clusters during ion sputtering.

L E Rehn1, R C Birtcher, S E Donnelly

  • 1Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.

Physical Review Letters
|November 3, 2001
PubMed
Summary
This summary is machine-generated.

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Previous studies found small clusters follow an inverse power law. Larger clusters (over 500 atoms) also follow this law, but with a different exponent, suggesting shock wave ablation as the production mechanism.

Area of Science:

  • Materials Science
  • Physics
  • Surface Science

Background:

  • Previous research established inverse power law distributions for small sputtered clusters (n ≤ 40).
  • These distributions exhibited exponents ranging from -8 to -4.

Purpose of the Study:

  • To investigate the size distributions of larger sputtered clusters (n ≥ 500).
  • To determine the underlying mechanism responsible for the formation of these larger clusters.

Main Methods:

  • Utilizing electron microscopy to analyze cluster size distributions.
  • Employing high-energy ion impacts to generate sputtered clusters.

Main Results:

  • Observed that larger clusters (n ≥ 500) also follow an inverse power law.

Related Experiment Videos

  • Determined a consistent exponent of -2 for larger clusters, independent of sputtering yield.
  • This indicates a distinct formation mechanism compared to smaller clusters.

    • Conclusions:

    • The formation of large sputtered clusters is attributed to shock waves generated by subsurface displacement cascades.
    • Surface ablation by these shock waves is the primary mechanism for producing large clusters.
    • The findings reveal a significant difference in cluster formation dynamics between small and large sputtered species.