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Laser-induced plasma formation in water with up to 400 mJ double-pulse LIBS

Plasma Science and Technology 2024年第1期26卷 93-100页

作者： Marion HENKEL Michelle SIEMENS ralf methling Benjamin EMDE Jörg HERMSDORF Steffen FRANKE Diego GONZALEZ Leibniz Institute for Plasma Science and Technology(INP) Felix-Hausdorff-Straße 2Greifswald 17489Germany Laser Zentrum Hannover e.V.(LZH) Hollerithallee 8Hannover 30419Germany

Double-pulse LIBS is a promising technique for deep-sea *** measurements in shallow water with up to 400 mJ each pulse were done to select laser parameters which promote optimized spectral line emission from plasma even at elevated pressures,where line broadening until loss of most of the spectral information can *** emission spectroscopy,using a Czerny-Turner spectrometer,has been applied to investigate the dependence of the emitted radiation on laser parameters and hydrostatic *** has been found,that higher laser pulse energies,especially with short pulse delay as required in high water pressure,can also have an adverse effect on the measured spectrum.

关键词： double-pulse LIBS underwater plasma formation emission spectrosocpy

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First‐mode of negative streamers:Inception at liquid/solid interfaces

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High Voltage 2021年第6期6卷 1069-1078页

作者： David Ariza Abderrahmane Beroual ralf methling Sergey Gortschakow Harold R.Chamorro School of Electrical Engineering KTH Royal Institute of TechnologyStockholmSweden Ecole Centrale de‐Lyon Ampère CNRS UMR 5005EcullyFrance Leibniz Institute for Plasma Science and Technology INP GreifswaldGermany

An experimental study of the inception of the first‐mode negative streamer at liquid/solid interfaces is presented in this *** study is performed with a point‐plane configuration under square high voltage *** electrode configuration is immersed in mineral oil and the liquid/solid interface is assembled in contact with the point electrode or in its *** polymers and two impregnated papers have been tested as solids of the liquid/solid ***,it is possible to compare the influence of different parameter of the solid and the interface on the streamer *** example:Permittivity,solid surface roughness,chemical composition,*** has been observed that streamer inception voltages at interfaces with solids of higher permittivity to that of the mineral oil are statistically ***,streamer inception voltages of streamer initiated free in the oil(no liquid/solid interface)are similar to that of the inception voltage of cases with solids with high *** contrast,the inception voltage of streamers initiated at permittivity matched interfaces are shown to be highest of the *** streamer inception voltage is also studied for different distances be-tween the liquid/solid interface and the point electrode with a permittivity matched *** results show a dependency of the inception voltage and the distance be-tween the point electrode and the ***,an analysis of the observation is performed to show that the Townsend‐Meek criterion cannot predict the obtained results.

关键词： solid liquid electrode

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