Seminář ÚFE: RNDr. Milan Šimek, Ph.D.

Srdečně vás zveme na přednášku RNDr. Milan šimek, Ph.D. z Oddělení impulsních plazmových systémů, Ústavu fyziky plazmatu, Akademie věd ČR.

Nanosecond discharges in liquid water: searching for fingerprints and signatures of underlying mechanisms

Investigating the driving mechanisms responsible for the generation of non-equilibrium discharges in liquid water and the corresponding plasma parameters is an extremely challenging task that is important for various applications based on plasma-liquid interaction.

In this presentation, I will discuss recent results obtained by combining several techniques with increased spatiotemporal resolution. These include shadow/interferometric imaging with a resolution of a few tens of picoseconds and emission spectrometry with a resolution ranging from several nanoseconds to hundreds of picoseconds.

The results obtained from different discharge phases show that discharges produced in liquid water with HV rise times of several nanoseconds evolve through a sequence of at least two phases, each characterized by a specific morphology. Under these conditions, the plasma emits characteristic UV-vis-NIR radiation, which we recently managed to resolve along a single discharge microfilament.

In combination with recent modeling results, the fundamental signatures of various mechanisms in plasma-liquid systems will be discussed.