Počet záznamů: 1  

Analysis of secondary emission mechanism in electron avalanches propagating in cylindrical nanoruptures in liquid water

  1. 1.
    0555685 - ÚFP 2022 GB eng J - Článek v odborném periodiku
    Bonaventura, Z. - Bílek, Petr - Tungli, J. - Šimek, Milan
    Analysis of secondary emission mechanism in electron avalanches propagating in cylindrical nanoruptures in liquid water.
    Plasma Sources Science & Technology. Roč. 31, č. 3 (2022), č. článku 035003. ISSN 0963-0252. E-ISSN 1361-6595
    Grant CEP: GA ČR(CZ) GA18-04676S
    Institucionální podpora: RVO:61389021
    Klíčová slova: cross-sections * vapor * electron multiplication * secondary emission * electrostriction * electron avalanche * water * nanosecond discharge in liquid water
    Obor OECD: Inorganic and nuclear chemistry
    Impakt faktor: 3.8, rok: 2022
    Způsob publikování: Omezený přístup
    https://iopscience.iop.org/article/10.1088/1361-6595/ac4ddf

    Recently, a bouncing-like mechanism for electron multiplication inside long nano-ruptures during the early stages of nanosecond discharge in liquid water has been proposed in (Bonaventura 2021 Plasma Sources Sci. Technol. 30 065023). This mechanism leads to the formation of electron avalanches within nano-ruptures caused by strong electrostrictive forces. The avalanche propagation is a self-sustaining process: the electrons emitted from the water surface to the cavity support the propagation of the avalanche and the avalanche itself is a source of the parent electrons impinging on the surface of the nano-rupture and causing secondary emission. We analyze the process of the electron secondary emission directly from the simulation results of the electron avalanche propagation. This allow us to perform an in situ study of the secondary emission and related physical processes. We present the results of an extensive parametric study performed using the state-of-the-art simulation toolkit Geant4-DNA for modeling electron-liquid water interactions. It is shown that the typical lifetime of an electron in an avalanche is about 0.1 to 0.2 picoseconds and that the electron experiences about 4 bounces before ending up in liquid water. In addition, it is shown that the secondary electrons are formed in a layer adjacent to the nano-rupture surface that is only a few nanometres thin. The secondary electron velocity distribution at the moment of the electron birth, the velocity space of electrons (re-)emitted from the water, and the velocity space of electrons at the moment of their impact to the cavity surface are analyzed in detail. Electron bouncing and secondary electron generation efficiency are quantified using the secondary emission coefficient, the secondary emission efficiency, and the effective energy consumed to produce new electrons.
    Trvalý link: http://hdl.handle.net/11104/0330149

     
     
Počet záznamů: 1  

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