Langmuir probe perturbations during in situ monitoring of pulsed laser deposition plasmas

0557069 - FZÚ 2023 RIV CH eng J - Článek v odborném periodiku
Irimiciuc, Stefan - Chertopalov, Sergii - Novotný, Michal - Craciun, V. - Lančok, Ján - Agop, M.
Langmuir probe perturbations during in situ monitoring of pulsed laser deposition plasmas.
Materials. Roč. 15, č. 8 (2022), č. článku 2769. E-ISSN 1996-1944
Grant CEP: GA ČR(CZ) GA20-21069S; GA MŠMT(CZ) EF16_019/0000760
Grant ostatní: OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institucionální podpora: RVO:68378271
Klíčová slova: laser-produced plasmas * Langmuir probe * perturbative regime * multifractal model * strange attractors
Obor OECD: Fluids and plasma physics (including surface physics)
Impakt faktor: 3.4, rok: 2022
Způsob publikování: Open access

We explored the limitations of Langmuir probe (LP) as a technique for in situ PLD control by performing investigations on several metallic plasmas, expanding in various Ar atmosphere conditions. Sub-microsecond modulation was seen in the reconstructed IV characteristics attributed to non-equilibrium dynamics of the ejected charges. A perturbative regime was recorded for Ar pressures higher than 2 Pa, where ionic bursts were observed in the electron saturation region. This perturbation was identified as a plasma fireball. A non-linear multifractal model was developed to explore new regimes of the LP. The strange attractors characterizing each fireball were reconstructed and their evolution with the Ar pressure is discussed. Both short- and long-time non-linear behavior were correlated via probe bias and the pressure effect on the strange attractors defining the fireball-like behavior was investigated. A good correlation was noticed between the simulated data and experimental findings.

Trvalý link: https://hdl.handle.net/11104/0334048