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Water-molecular emission from cavitation bubbles affected by electric fields.

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Area of Science:

  • Acoustics
  • Plasma Physics
  • Spectroscopy

Background:

  • Sonoluminescence (SL) is light emission from collapsing bubbles.
  • Multibubble sonoluminescence (MBSL) involves numerous bubbles and can produce different spectra.
  • Electric fields near transducers may influence SL.

Purpose of the Study:

  • To investigate the origin and spectral characteristics of orange emission in MBSL.
  • To explore the role of electric fields in MBSL.
  • To propose a mechanism for the observed emission.

Main Methods:

  • Performing MBSL experiments in water saturated with noble gases (He, Ne, Kr) at 1 MHz.
  • Utilizing a piezoceramic transducer with a peeled ground electrode.
  • Analyzing the emission spectrum, focusing on the near-infrared region.

Main Results:

  • Observed orange emission localized near the transducer's electrode.
  • The emission spectrum showed a broad component increasing towards the near-infrared, with peaks at 713 and 813 nm.
  • Spectral shape was consistent across different noble gases.

Conclusions:

  • The electric fields from the transducer likely influence cavitation bubbles, causing the observed emission.
  • The broad spectral component is attributed to vibration-rotation transitions of water molecules, broadened by high pressure and electric fields during bubble collapse.
  • A proposed emission mechanism involves charge induction and the charged droplet model.