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The group "Allgemeine Elektrotechnik und Plasmatechnik" at the faculty for engineering and information science.

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Spatio-temporal dynamics of electrons and helium metastables in uniform dielectric barrier discharges formed in He/N₂

A uniform atmospheric pressure dielectric barrier discharge is operated in helium with an admixture (0.45%) of nitrogen. The discharge is ignited in the gas gap between a driven and a grounded electrode and propagates along the dielectric surface outside the gap. Plasma conditions are characterized with current and voltage measurements and by application of absolutely calibrated optical emission spectroscopy, with a focus on nitrogen molecular emission. Plasma parameters, namely electron density and reduced electric field are determined with spatial and temporal resolution in the frame of collisional-radiative model by application of calibrated intensified CCD camera and Abel inversion of measured images. The density of helium metastable states is calculated using the measured plasma parameters and successfully compared with values measured using tunable diode laser absorption spectroscopy.

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Permanent Identifier (URI)
Is supplementing
Plasma Source Name
Plasma Source Specification
Plasma Medium Name
Plasma Medium Properties
Helium with 0.45% nitrogen admixture at atmospheric pressure with a flow of 2 slm
Contact Name
Niklas Nawrath
Contact Email
Plasma Diagnostic Properties
TDLAS for He(2³S) at 1083 nm Camera images at 390 and 380 nm to filter for emission of N₂(C-B) and N₂⁺(B-X) with a exposure time of 40 ns.
Public Access Level
Plasma Diagnostic Name
Funding Agency

Data and Resources

Niklas Nawrath