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Stable nonspherical bubble collapse including period doubling in sonoluminescence
Jeppe Seidelin Dam1, Mogens T Levinsen, Martin Skogstad
1Complexity Laboratory, Niels Bohr Institute, Blegdamsvej 17, DK-2100 Copenhagen Ø, Denmark.
Summary
We observed stable, non-spherical states in single bubble sonoluminescence, challenging previous theories. These symmetry-breaking phenomena, not period doubling, are key to understanding sonoluminescence.
Area of Science:
- Physics
- Acoustics
- Fluid Dynamics
Background:
- Single bubble sonoluminescence (SBSL) exhibits complex dynamics, including period doubling.
- Previous theories primarily focused on radially bifurcated collapses to explain SBSL phenomena.
Purpose of the Study:
- To investigate the nature of observed states in single bubble sonoluminescence.
- To differentiate between spherical symmetry breaking and period doubling as primary mechanisms in SBSL.
Main Methods:
- Utilized a fiber-based, four-channel correlation scheme for observations.
- Conducted measurements with and without narrow-band optical filters (650+/-40 nm).
Main Results:
- Observed stable, symmetry-broken states in SBSL, including spatially oriented and tumbling states.
- Symmetry breaking was evident even with a narrow-band optical filter, suggesting it's a fundamental aspect.
- Period doubling appears to be a secondary effect, if present at all, in the total light output.
Conclusions:
- The primary mechanism driving observed phenomena in SBSL is the breaking of spherical symmetry during bubble collapse.
- This finding necessitates a re-evaluation of existing theoretical models for SBSL.
- The observed symmetry-broken states offer a new avenue for distinguishing between competing light emission theories in SBSL.