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Related Experiment Videos

Charge-induced fragmentation of sodium clusters.

P Blaise1, S A Blundell, C Guet

  • 1Département de Recherche Fondamentale sur la Matière Condensée, CEA-Grenoble, 17, rue des Martyrs, F-38054 Grenoble CEDEX 9, France.

Physical Review Letters
|August 11, 2001
PubMed
Summary

Highly charged sodium clusters undergo fission. Smaller clusters fragment into sodium ions, while larger ones emit Na+3. This behavior is independent of temperature up to 1500 K.

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Area of Science:

  • Atomic and Molecular Physics
  • Computational Chemistry
  • Nuclear Physics

Background:

  • Understanding cluster fission is crucial for nuclear physics and materials science.
  • Previous studies have explored cluster dynamics, but detailed mechanisms for highly charged systems remain elusive.

Purpose of the Study:

  • To investigate the fission dynamics of highly charged sodium clusters using ab initio molecular dynamics.
  • To elucidate the fragmentation pathways and fragment characteristics as a function of charge state.

Main Methods:

  • Ab initio molecular dynamics simulations were employed.
  • The study focused on sodium clusters with varying high charge states (Q).
  • Fission and fragmentation processes were analyzed on time scales of picoseconds.

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Main Results:

  • Na4+24 clusters predominantly emit Na+3 sequentially within 1 ps.
  • Na(Q+)(24) clusters (5 ≤ Q ≤ 8) exhibit multifragmentation on time scales ≥ 0.1 ps.
  • Na+ becomes the dominant fragment as the charge state (Q) increases.
  • Singly charged fragments (Na+(n), n ≤ 6) were observed.
  • Fragment spectra were largely independent of parent cluster temperature (T ≤ 1500 K).

Conclusions:

  • The observed fission and fragmentation patterns provide insights into the behavior of highly charged atomic clusters.
  • Findings align with and explain recent experimental observations in cluster physics.
  • The temperature independence of the fragment spectrum suggests robust fragmentation mechanisms.