Bulletin of the American Physical Society
76th Annual Gaseous Electronics Conference
Volume 68, Number 9
Monday–Friday, October 9–13, 2023; Michigan League, Ann Arbor, Michigan
Session HR4: Plasma in Liquids
1:30 PM–3:30 PM,
Thursday, October 12, 2023
Room: Michigan League, Michigan
Chair: Ahmad Hamdan, Université de Montréal
Abstract: HR4.00001 : Ultrafast optical diagnostics of evolving nanosecond plasmas in liquid water and signatures of discharge mechanisms.*
1:30 PM–2:00 PM
Presenter:
Milan Šimek
(Institute of Plasma Physics of the Czech Academy of Sciences)
Authors:
Milan Šimek
(Institute of Plasma Physics of the Czech Academy of Sciences)
Vaclav Prukner
(Institute of Plasma Physics of the Czech Academy of Sciences)
Garima Arora
(Institute of Plasma Physics of the Czech Academy of Sciences)
Petr Bilek
(Institute of Plasma Physics of the Czech Academy of Sciences)
Jiri Schmidt
(Institute of Plasma Physics of the Czech Academy of Sciences)
Petr Hoffer
(Institute of Plasma Physics of the Czech Academy of Sciences)
Under investigated conditions, the images reveal the morphology and dynamics of expanding discharge, while ICCD spectra obtained as a function of distance from the anode tip provide time-dependent emission spectra. The discharge emits characteristic UV-vis-NIR continua along the discharge developed from the anode surface, which we have recently resolved spatially (tens of micrometers) along the anode symmetry axis with (sub)nanosecond temporal resolution. The very initial emission spectra show a broadband continuum followed by atomic lines during the later stages. Line profiles can be extracted using the modeled continuum to obtain a spectral line shape at a specific spatial and temporal coordinate. We show that electron number densities at later times (tens of nanoseconds) can be estimated from the broadening and shifts of atomic hydrogen and oxygen lines. The temporal and spatial electron number densities evolve significantly with time (1020 – 1018 cm-3 from 30 ns to 450 ns) and with only small changes in the electron density with distance from the anode tip. These results are consistent with images taken with high temporal resolution (ns) using either an ICCD spectrometer (0th diffraction order) or a 4-channel ICCD imaging device.
*This research work was carried out with the support of the Grant Agency of the Czech Republic (GA 18-04676S).
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