Petr Hoffer
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Temporally and spatially resolved continuum radiation between 600 and 1000 nm from nanosecond discharge in water: implications for understanding the initiation mystery Open
Emission spectra of a nanosecond discharge initiated in liquid water provide an important tool for investigating the driving mechanisms and fundamental properties of in-liquid plasmas. In this work, we report for the first time on optical …
Quantifying Plasma Dose for Barley Seed Treatment by Volume Dielectric Barrier Discharges in Atmospheric-Pressure Synthetic Air Open
Plasma-assisted treatment is a potentially interesting technology for advanced seed processing. In this work, we address the issue of defining and quantifying the plasma dose during the exposure of seeds to microdischarges formed in a barr…
Surface DBD in moist air for nitrogen fixation: a comparative study of pulsed versus amplitude-modulated AC powered discharge Open
Surface DBD (SDBD) discharge maintained in moist air in the immediate vicinity of the water surface is an effective source of reactive species for the production of plasma-activated water (PAW). In this work, we investigated the water acti…
View article: Determination of Highly Transient Electric Field in Water Using the Kerr Effect with Picosecond Resolution
Determination of Highly Transient Electric Field in Water Using the Kerr Effect with Picosecond Resolution Open
This study utilizes the Kerr effect in the analysis of a pulsed electric field (intensity ~108 V/m, limited by the liquid dielectric strength) in deionized water at the sub-nanosecond time scale. The results provide information about volta…
Properties and characteristics of the nanosecond discharge developing at the water–air interface: tracking evolution from a diffused streamer to a spark filament Open
The characteristics of nanosecond discharge propagating along the water–air interface in a unique dielectric-barrier discharge (DBD)-like configuration with coplanar electrodes submerged in deionised (DI)/tap water are studied by combining…
Streamer-induced kinetics of excited states in pure N<sub>2</sub>: I. Propagation velocity, E/N and vibrational distributions of N<sub>2</sub>(C 3Πu ) and N 2+ (B 2Σu+ ) states Open
The emission spectra of a streamer discharge in pure nitrogen provide an important tool for investigating the fundamental kinetics of excited electronic states of N 2 and benchmark data for validating advanced kinetic schemes for numerical…
High-speed imaging reveals the dynamics of the initiation and subsequent evolution of a nanosecond discharge propagating along the air–water interface Open
A nanosecond DBD-like discharge in a coplanar electrode configuration propagating along the water–air interface is an efficient source of reactive species to produce plasma-activated water. In this letter, we report on the mechanism of the…
Pressure in underwater spark discharge initiated with the help of bubble injection and its evaluation based on H-alpha line broadening Open
The pressure in an underwater discharge channel is the main parameter that influences all its applications. In this study, we investigate a relatively large gap with a plane-to-plane electrode geometry that uses the assistance of an inject…
Optical Emission Spectroscopy of Underwater Spark Generated by Pulse High-Voltage Discharge with Gas Bubble Assistant Open
This paper is aimed at the investigation of the acoustic and spectral characteristics of underwater electric sparks generated between two plate electrodes, using synchronized gas bubble injection. There are two purposes served by discharge…
Demonstration of Dynamics of Nanosecond Discharge in Liquid Water Using Four-Channel Time-Resolved ICCD Microscopy Open
The microscopic physical mechanisms of micro-discharges produced in liquid waters by nanosecond high-voltage pulses are quite complex phenomena, and relevant coherent experimentally supported theoretical descriptions are yet to be provided…
On modeling of “plasmoid” created by electric discharge Open
Gas dynamic modeling approach was applied to "plasmoid" formed in experimental electrical discharge breakdown in a cathode ceramic tube filled by a conductive liquid. Measured parameters were applied to the model in order to improve it. Qu…