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Optical emissions in a sonoluminescing bubble

Chen1, Leung, Chu

  • 1Department of Physics, The Chinese University of Hong Kong, Hong Kong, China.

Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
|December 2, 2000
PubMed
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The spontaneous decay rate of atoms within sonoluminescing bubbles (SLBs) can be enhanced by the extreme conditions during bubble collapse. A plasma shell significantly boosts this atomic decay, impacting light emission.

Area of Science:

  • Atomic physics
  • Acoustics
  • Plasma physics

Background:

  • Sonoluminescing bubbles (SLBs) involve extreme conditions like high density and temperature during collapse.
  • Understanding atomic decay mechanisms in these environments is crucial for explaining light emission.

Purpose of the Study:

  • To investigate the influence of high-density, high-temperature environments on atomic spontaneous decay within SLBs.
  • To model the photon density of states in multi-layered spheres simulating SLB stages.

Main Methods:

  • Theoretical study of photon density of states in multi-layered spherical structures.
  • Mimicking various stages of sonoluminescing bubble collapse using layered sphere models.

Main Results:

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  • The density of states of photons was studied in multi-layered spheres.
  • A significant enhancement of the spontaneous decay rate was observed in the presence of a thin plasma shell.
  • This finding aligns with recent numerical hydrodynamic simulations of SLBs.

    • Conclusions:

    • The presence of a plasma shell within a sonoluminescing bubble can strongly enhance atomic spontaneous decay rates.
    • This enhancement is a key factor in understanding the light emission from SLBs under extreme conditions.