National Institute of Fundamental Studies

Project Description

Single-Bubble Sonoluminescence (SBSL) is observed when a single gas bubble, which is acoustically levitated in a liquid, undergoes nonlinear oscillations in synchrony with the applied sound field and emits subnanosecond flashes of light at the point of maximum implosion. As the bubble collapses, vibrational energy gets concentrated by at least a factor of 4x1011 to produce flashes of light in the UV range. These flashes of ultraviolet light have durations much shorter than a Nanosecond. At the latter stages of the collapse, both the temperature and the pressure inside the bubble reach extreme values such as 20,000K and 3,500 atm respectively. Also the bubble wall reaches acceleration over 1011 g near the maximum implosion. SBSL is observed by only with the bubbles having ambient radii between 1 µm to 10 µm and during the collapse radii of these bubbles come down to 0.1 µm to 1µm . The mechanism and the details of physical conditions and chemical processes in the bubble at the last stage of the bubble collapse have not been understood completely.

Our research group investigates the physical conditions at the last stage of the bubble collapse in Single Bubble Sonoluminescence (SBSL) using

  • Theoretical and Computational techniques
  • Experimental methods

- Information provided by the Group Leader -