Scenario of the electric breakdown and UV radiation spectra at single bubble sonoluninescence
Garcia N., Levanyuk A.P., Osipov V.V.
PACS: 43.20.+g, 52.80.Wq, 77.22.-d, 78.60.Mq
In a preceding paper we put forward a hypothesis that the single bubble sonolumines-cence (SBSL) is caused by strong electric fields occurring near the surface of collapsing gas bubble because of the flexoelectric effect in water. Here we argue that these fields can indeed provoke an multiple electric breakdown in water, in a micron-size region near the surface of the collapsing gas bubble, and show that the main numerical characteristics of the SBSL can be naturally explained within this mechanism. The SBSL spectra are determined by radiation transitions between high-energy levels of noble gas atoms excited by hot electrons created by strong flexoelectric field in a "cold" water.
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![](/ps/917/article_14030_800_head.png "<b>In a preceding paper we put forward a hypothesis that the single bubble sonolumines-cence (SBSL) is caused by strong electric fields occurring near the surface of collapsing gas bubble because of the flexoelectric effect in water. Here we argue that these fields can indeed provoke an multiple electric breakdown in water, in a micron-size region near the surface of the collapsing gas bubble, and show that the main numerical characteristics of the SBSL can be naturally explained within this mechanism. The SBSL spectra are determined by radiation transitions between high-energy levels of noble gas atoms excited by hot electrons created by strong flexoelectric field in a "cold" water.</b>")