Rates and channels of water ionization by a high-current high-voltage pulsed discharge |
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Authors: | E. I. Skibenko V. B. Yuferov I. V. Buravilov A. N. Ponomarev |
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Affiliation: | (1) National Science Center Kharkov Institute of Physics and Technology, ul. Akademicheskaya 1, Kharkiv, 61108, Ukraine |
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Abstract: | The experimentally observed growth of the plasma density in a high-current high-voltage pulsed discharge in a liquid medium is compared with the results of calculations based on the effective cross sections for electron-impact ionization and other elementary processes. It is found that, in the initial stage of the discharge, the plasma density grows linearly with time, whereas at densities above 3 × 1010 cm?3, the growth becomes exponential due to the collective acceleration of plasma electrons. The gas-vapor fraction of the water medium is ionized by two groups of electrons: low-energy electrons, with energies about several tens of electronvolts, and high-energy ones, with energies in the kiloelectronvolt range. The energy spent on water ionization is estimated and is found to be several times higher than the energy required to ionize a rarefied gas. |
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