dorsal/arxiv
View SchemaNature of Sonoluminescence: Noble Gas Radiation Excited by Hot Electrons in "Cold" Water
| Authors | N. Garcia, A. Levanyuk, V. V. Osipov |
|---|---|
| Categories | |
| ArXiv ID | physics/0003052 |
| URL | https://arxiv.org/abs/physics/0003052 |
| DOI | 10.1103/PhysRevE.62.2168 |
Abstract
We show that strong electric fields occurring in water near the surface of collapsing gas bubbles because of the flexoelectric effect can provoke dynamic electric breakdown in a micron-size region near the bubble and consider the scenario of the SBSL. The scenario is: (i) at the last stage of incomplete collapse of the bubble the gradient of pressure in water near the bubble surface has such a value and sign that the electric field arising from the flexoelectric effect exceeds the threshold field of the dynamic electrical breakdown of water and is directed to the bubble center; (ii) mobile electrons are generated because of thermal ionization of water molecules near the bubble surface; (iii) these electrons are accelerated in ''cold'' water by the strong electric fields; (iv) these hot electrons transfer noble gas atoms dissolved in water to high-energy excited states and optical transitions between these states produce SBSL UV flashes in the trasparency window of water; (v) the breakdown can be repeated several times and the power and duration of the UV flash are determined by the multiplicity of the breakdowns. The SBSL spectrum is found to resemble a black-body spectrum where temperature is given by the effective temperature of the hot electrons. The pulse energy and some other characteristics of the SBSL are found to be in agreement with the experimental data when realistic estimations are made.
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"abstract": "We show that strong electric fields occurring in water near the surface of\ncollapsing gas bubbles because of the flexoelectric effect can provoke dynamic\nelectric breakdown in a micron-size region near the bubble and consider the\nscenario of the SBSL. The scenario is: (i) at the last stage of incomplete\ncollapse of the bubble the gradient of pressure in water near the bubble\nsurface has such a value and sign that the electric field arising from the\nflexoelectric effect exceeds the threshold field of the dynamic electrical\nbreakdown of water and is directed to the bubble center; (ii) mobile electrons\nare generated because of thermal ionization of water molecules near the bubble\nsurface; (iii) these electrons are accelerated in \u0027\u0027cold\u0027\u0027 water by the strong\nelectric fields; (iv) these hot electrons transfer noble gas atoms dissolved in\nwater to high-energy excited states and optical transitions between these\nstates produce SBSL UV flashes in the trasparency window of water; (v) the\nbreakdown can be repeated several times and the power and duration of the UV\nflash are determined by the multiplicity of the breakdowns. The SBSL spectrum\nis found to resemble a black-body spectrum where temperature is given by the\neffective temperature of the hot electrons. The pulse energy and some other\ncharacteristics of the SBSL are found to be in agreement with the experimental\ndata when realistic estimations are made.",
"arxiv_id": "physics/0003052",
"authors": [
"N. Garcia",
"A. Levanyuk",
"V. V. Osipov"
],
"categories": [
"physics.flu-dyn",
"physics.optics"
],
"doi": "10.1103/PhysRevE.62.2168",
"title": "Nature of Sonoluminescence: Noble Gas Radiation Excited by Hot Electrons in \"Cold\" Water",
"url": "https://arxiv.org/abs/physics/0003052"
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