A1: Highly sensitive measurements of electric fields with E-FISH, and key atomic and molecular species with THz absorption spectroscopy and cavity-enhanced spectroscopy techniques

Principal Investigators: Jean Pierre van Helden, Inna Orel

Team

van Helden, Jean Pierre (Principal Investigator)

Orel, Inna (Principal Investigator)

Czarnetzki, Uwe (Senior Professor)

Lepikhin, Nikita (External consultant)

Description

The electric field is an important parameter to control a discharge and, in particular, the generation of reactive species. The project aims at the determination of electric fields in plasma using picosecond electric field induced second harmonic generation (E-FISH) technique, which has been studied intensively and has been optimised for non-equilibrium atmospheric pressure plasmas. This work is complemented by two diagnostic techniques: THz absorption spectroscopy and cavity ring-down spectroscopy to determine key atomic and molecular species.

Publications

• Nanosecond resolved vibrational kinetics of CO₂ in CO₂/N₂ mixtures measured in a pulsed discharge jet
  C. A. Busch, N. D. Lepikhin, I. Orel, J. Kuhfeld, D. Luggenhölscher, U. Czarnetzki
  J. Phys. D: Appl. Phys. 58, 065202 (2025)
  
• Space and time resolved characterization of a He-N2 RF atmospheric pressure plasma jet by E-FISH measurements and PIC/MCC simulations
  I. Orel, N. D. Lepikhin, D Luggenhölscher, U. Czarnetzki, Z. Donkó
  Plasma Sources Sci. Technol. accepted (2025)
  
• Increasing the EFISH sensitivity by an Optical Parametric Amplifier
  Nikita Lepikhin, Dirk Luggenhölscher, Uwe Czarnetzki
  Optics Letters (2025), accepted
  
• Zero-dimensional simulations of DC ns-pulsed plasma jet in N₂ at near atmospheric pressure: validation of the vibrational kinetics
  Y. He, J. Kuhfeld, N. D. Lepikhin, U. Czarnetzki, V. Guerra, R. P. Brinkmann, A. R. Gibson, E. H. Kemaneci
  Plasma Sources Sci. Technol. 33, 115011 (2024)
  Repository: https://rdpcidat.rub.de/node/1040
• Self-consistent calculation of the optical emission spectrum of an argon capacitively coupled plasma based on the coupling of particle simulation with a collisional-radiative model
  Z. Donkó, T. V. Tsankov, P. Hartmann, F. J. Arellano, U. Czarnetzki, S. Hamaguchi
  J. Phys. D: Appl. Phys. 57, 375209 (2024)
  
• PIC/MCC simulation for a ns-pulsed glow discharge in nitrogen at sub-atmospheric pressure and analysis of its quasi-steady state physics
  J. Kuhfeld, N. D. Lepikhin, D. Luggenhölscher, U. Czarnetzki, Z. Donkó
  Plasma Sources Sci. Technol. 32, 084001 (2023)
  Repository: https://rdpcidat.rub.de/node/804
• Breakdown and quasi-DC phase of a nanosecond discharge. Comparison of Optical Emission Spectroscopy measurements with numerical simulations
  N. D. Lepikhin, J. Kuhfeld, Z. Donkó, D. Luggenhölscher, U. Czarnetzki
  Plasma Sources Sci. Technol. 32, 084002 (2023)
  
• On electric field measurements based on intensity ratio of 1^- and 2⁺ systems of nitrogen in discharges with high specific deposited energy
  N. D. Lepikhin, N. A. Popov, S. M. Starikovskaia
  Plasma Sources Sci. Technol. 31, 084002 (2022)
  
• Electric field measurements in a He:N₂nanosecond pulsed discharge with sub-ns time resolution
  N. Lepikhin, D. Luggenhölscher, U. Czarnetzki
  J. Phys. D: Appl. Phys. 54, 055201 (2021)
  Repository: https://rdpcidat.rub.de/node/297
• Vibrational CARS measurements in a near-atmospheric pressure plasma jet in nitrogen: I. Measurement procedure and results
  J. Kuhfeld, N. Lepikhin, D. Luggenhölscher, U. Czarnetzki
  J. Phys. D: Appl. Phys. 54, 305204 (2021)
  Repository: https://rdpcidat.rub.de/node/322
• Vibrational CARS measurements in a near-atmospheric pressure plasma jet in Nitrogen: II. Analysis
  J. Kuhfeld, D. Luggenhölscher, U. Czarnetzki
  J. Phys. D: Appl. Phys. 54, 305205 (2021)
  Repository: https://rdpcidat.rub.de/node/410