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Multiscale dynamics of cluster fragmentation.

F Calvo1, D Bonhommeau, P Parneix

  • 1Laboratoire de Chimie et Physique Quantiques, IRSAMC, Université Paul Sabatier, 118 Route de Narbonne, F31062, Toulouse Cedex, France. fcalvo@lasim.univ-lyon1.fr

Physical Review Letters
|October 13, 2007
PubMed
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Rare-gas cluster fragmentation was studied using multiple methods over various timescales. Results show cluster properties become statistical after just 1 picosecond, despite initial disequilibrium.

Area of Science:

  • Atomic and Molecular Physics
  • Chemical Physics
  • Computational Chemistry

Background:

  • Rare-gas clusters are fundamental systems for studying phase transitions and dynamics.
  • Understanding cluster fragmentation is crucial for fields like plasma physics and materials science.

Purpose of the Study:

  • To theoretically investigate the time-dependent fragmentation dynamics of rare-gas clusters.
  • To explore fragmentation processes across a wide range of timescales, from femtoseconds to milliseconds.

Main Methods:

  • Employed a multiscale theoretical approach combining nonadiabatic molecular dynamics, classical dynamics, and kinetic theory.
  • Simulated ionization and electronic excitation dynamics on the femtosecond scale.
  • Modeled ground electronic state dynamics and the final evaporative cascade on longer timescales.

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Main Results:

  • Demonstrated that rare-gas clusters, initially far from equilibrium after excitation, exhibit statistical properties.
  • Showcased the emergence of statistical behavior as early as 1 picosecond.
  • Validated the multiscale protocol for capturing fragmentation dynamics across diverse time regimes.

Conclusions:

  • The fragmentation of excited rare-gas clusters rapidly approaches statistical behavior.
  • A multiscale approach is effective for modeling complex cluster dynamics over extended periods.
  • The 1 ps timescale is a critical point for the onset of statistical properties in cluster fragmentation.