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Area of Science:

  • Physical Chemistry
  • Acoustics
  • Spectroscopy

Background:

  • Single-bubble sonoluminescence (SBSL) is a phenomenon involving light emission from collapsing bubbles.
  • Sodium (Na) emission has been observed in sonoluminescence, but the underlying mechanisms, especially in SBSL at low acoustic pressures, require further elucidation.
  • Understanding spectral components in SBSL is crucial for characterizing the physical conditions within the bubble.

Purpose of the Study:

  • To investigate the origin of Na emission in SBSL under specific experimental conditions.
  • To correlate bubble dynamics, specifically bubble dancing, with Na emission intensity.
  • To compare the spectral characteristics of Na emission in SBSL with those in multibubble sonoluminescence (MBSL).

Main Methods:

  • Utilizing a 0.1mM sodium dodecyl sulfate (SDS) solution with dissolved noble gas.
  • Employing high-speed shadowgraph movies at 30,000 frames per second to capture bubble dynamics.
  • Analyzing the spectral components of Na emission in both SBSL and MBSL.

Main Results:

  • Na emission was observed in SBSL at low acoustic pressure, where continuous spectral components were negligible.
  • High-speed imaging revealed that bubble dancing, characterized by bubble disintegration and coalescence, was responsible for Na emission.
  • A strong correlation was found between the measured bubble path length and the intensity of Na emission.
  • The Na spectrum in SBSL exhibited a narrow component, distinct from the narrow and broad components observed in MBSL.

Conclusions:

  • Bubble dancing, driven by bubble disintegration and coalescence, is the primary mechanism for Na emission in SBSL under the studied conditions.
  • The observed correlation between bubble path length and Na intensity provides quantitative evidence for the role of bubble dynamics.
  • The spectral differences between SBSL and MBSL indicate distinct conditions for Na emission generation in these two sonoluminescence regimes.