Experimental and computational investigations of electron dynamics in micro atmospheric pressure radio-frequency plasma jets operated in He/N2 mixtures

L. Bischoff, G. Hübner, I. Korolov, Z. Donkó, P. Hartmann, T. Gans, J. Held, V. Schulz-Von Der Gathen, Y. Liu, T. Mussenbrock, J. Schulze

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The electron power absorption dynamics in radio frequency driven micro atmospheric pressure capacitive plasma jets are studied based on experimental phase resolved optical emission spectroscopy and the computational particle in cell simulations with Monte Carlo treatment of collisions. The jet is operated at 13.56 MHz in He with different admixture concentrations of N2 and at several driving voltage amplitudes. We find the spatio-temporal dynamics of the light emission of the plasma at various wavelengths to be markedly different. This is understood by revealing the population dynamics of the upper levels of selected emission lines/bands based on comparisons between experimental and simulation results. The populations of these excited states are sensitive to different parts of the electron energy distribution function and to contributions from other excited states. Mode transitions of the electron power absorption dynamics from the Ω- to the Penning-mode are found to be induced by changing the N2 admixture concentration and the driving voltage amplitude. Our numerical simulations reveal details of this mode transition and provide novel insights into the operation details of the Penning-mode. The characteristic excitation/emission maximum at the time of maximum sheath voltage at each electrode is found to be based on two mechanisms: (i) a direct channel, i.e. excitation/emission caused by electrons generated by Penning ionization inside the sheaths and (ii) an indirect channel, i.e. secondary electrons emitted from the electrode due to the impact of positive ions generated by Penning ionization at the electrodes.

Original languageEnglish
Article number125009
JournalPlasma Sources Science and Technology
Volume27
Issue number12
DOIs
Publication statusPublished - Dec 28 2018

Fingerprint

plasma jets
atmospheric pressure
radio frequencies
admixtures
sheaths
excitation
electrodes
electric potential
electrons
ionization
simulation
optical emission spectroscopy
positive ions
light emission
energy distribution
distribution functions
electron energy
collisions
cells
wavelengths

Keywords

  • atmospheric pressure plasma jet
  • electron heating
  • optical emission spectroscopy
  • particle-in-cell simulation

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Experimental and computational investigations of electron dynamics in micro atmospheric pressure radio-frequency plasma jets operated in He/N2 mixtures. / Bischoff, L.; Hübner, G.; Korolov, I.; Donkó, Z.; Hartmann, P.; Gans, T.; Held, J.; Schulz-Von Der Gathen, V.; Liu, Y.; Mussenbrock, T.; Schulze, J.

In: Plasma Sources Science and Technology, Vol. 27, No. 12, 125009, 28.12.2018.

Research output: Contribution to journalArticle

Bischoff, L. ; Hübner, G. ; Korolov, I. ; Donkó, Z. ; Hartmann, P. ; Gans, T. ; Held, J. ; Schulz-Von Der Gathen, V. ; Liu, Y. ; Mussenbrock, T. ; Schulze, J. / Experimental and computational investigations of electron dynamics in micro atmospheric pressure radio-frequency plasma jets operated in He/N2 mixtures. In: Plasma Sources Science and Technology. 2018 ; Vol. 27, No. 12.
@article{115386155bec49a5a6df001c0d43b8d1,
title = "Experimental and computational investigations of electron dynamics in micro atmospheric pressure radio-frequency plasma jets operated in He/N2 mixtures",
abstract = "The electron power absorption dynamics in radio frequency driven micro atmospheric pressure capacitive plasma jets are studied based on experimental phase resolved optical emission spectroscopy and the computational particle in cell simulations with Monte Carlo treatment of collisions. The jet is operated at 13.56 MHz in He with different admixture concentrations of N2 and at several driving voltage amplitudes. We find the spatio-temporal dynamics of the light emission of the plasma at various wavelengths to be markedly different. This is understood by revealing the population dynamics of the upper levels of selected emission lines/bands based on comparisons between experimental and simulation results. The populations of these excited states are sensitive to different parts of the electron energy distribution function and to contributions from other excited states. Mode transitions of the electron power absorption dynamics from the Ω- to the Penning-mode are found to be induced by changing the N2 admixture concentration and the driving voltage amplitude. Our numerical simulations reveal details of this mode transition and provide novel insights into the operation details of the Penning-mode. The characteristic excitation/emission maximum at the time of maximum sheath voltage at each electrode is found to be based on two mechanisms: (i) a direct channel, i.e. excitation/emission caused by electrons generated by Penning ionization inside the sheaths and (ii) an indirect channel, i.e. secondary electrons emitted from the electrode due to the impact of positive ions generated by Penning ionization at the electrodes.",
keywords = "atmospheric pressure plasma jet, electron heating, optical emission spectroscopy, particle-in-cell simulation",
author = "L. Bischoff and G. H{\"u}bner and I. Korolov and Z. Donk{\'o} and P. Hartmann and T. Gans and J. Held and {Schulz-Von Der Gathen}, V. and Y. Liu and T. Mussenbrock and J. Schulze",
year = "2018",
month = "12",
day = "28",
doi = "10.1088/1361-6595/aaf35d",
language = "English",
volume = "27",
journal = "Plasma Sources Science and Technology",
issn = "0963-0252",
publisher = "IOP Publishing Ltd.",
number = "12",

}

TY - JOUR

T1 - Experimental and computational investigations of electron dynamics in micro atmospheric pressure radio-frequency plasma jets operated in He/N2 mixtures

AU - Bischoff, L.

AU - Hübner, G.

AU - Korolov, I.

AU - Donkó, Z.

AU - Hartmann, P.

AU - Gans, T.

AU - Held, J.

AU - Schulz-Von Der Gathen, V.

AU - Liu, Y.

AU - Mussenbrock, T.

AU - Schulze, J.

PY - 2018/12/28

Y1 - 2018/12/28

N2 - The electron power absorption dynamics in radio frequency driven micro atmospheric pressure capacitive plasma jets are studied based on experimental phase resolved optical emission spectroscopy and the computational particle in cell simulations with Monte Carlo treatment of collisions. The jet is operated at 13.56 MHz in He with different admixture concentrations of N2 and at several driving voltage amplitudes. We find the spatio-temporal dynamics of the light emission of the plasma at various wavelengths to be markedly different. This is understood by revealing the population dynamics of the upper levels of selected emission lines/bands based on comparisons between experimental and simulation results. The populations of these excited states are sensitive to different parts of the electron energy distribution function and to contributions from other excited states. Mode transitions of the electron power absorption dynamics from the Ω- to the Penning-mode are found to be induced by changing the N2 admixture concentration and the driving voltage amplitude. Our numerical simulations reveal details of this mode transition and provide novel insights into the operation details of the Penning-mode. The characteristic excitation/emission maximum at the time of maximum sheath voltage at each electrode is found to be based on two mechanisms: (i) a direct channel, i.e. excitation/emission caused by electrons generated by Penning ionization inside the sheaths and (ii) an indirect channel, i.e. secondary electrons emitted from the electrode due to the impact of positive ions generated by Penning ionization at the electrodes.

AB - The electron power absorption dynamics in radio frequency driven micro atmospheric pressure capacitive plasma jets are studied based on experimental phase resolved optical emission spectroscopy and the computational particle in cell simulations with Monte Carlo treatment of collisions. The jet is operated at 13.56 MHz in He with different admixture concentrations of N2 and at several driving voltage amplitudes. We find the spatio-temporal dynamics of the light emission of the plasma at various wavelengths to be markedly different. This is understood by revealing the population dynamics of the upper levels of selected emission lines/bands based on comparisons between experimental and simulation results. The populations of these excited states are sensitive to different parts of the electron energy distribution function and to contributions from other excited states. Mode transitions of the electron power absorption dynamics from the Ω- to the Penning-mode are found to be induced by changing the N2 admixture concentration and the driving voltage amplitude. Our numerical simulations reveal details of this mode transition and provide novel insights into the operation details of the Penning-mode. The characteristic excitation/emission maximum at the time of maximum sheath voltage at each electrode is found to be based on two mechanisms: (i) a direct channel, i.e. excitation/emission caused by electrons generated by Penning ionization inside the sheaths and (ii) an indirect channel, i.e. secondary electrons emitted from the electrode due to the impact of positive ions generated by Penning ionization at the electrodes.

KW - atmospheric pressure plasma jet

KW - electron heating

KW - optical emission spectroscopy

KW - particle-in-cell simulation

UR - http://www.scopus.com/inward/record.url?scp=85060165728&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85060165728&partnerID=8YFLogxK

U2 - 10.1088/1361-6595/aaf35d

DO - 10.1088/1361-6595/aaf35d

M3 - Article

AN - SCOPUS:85060165728

VL - 27

JO - Plasma Sources Science and Technology

JF - Plasma Sources Science and Technology

SN - 0963-0252

IS - 12

M1 - 125009

ER -