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P: Fachverband Plasmaphysik
P 4: Codes and Modeling I
P 4.2: Invited Talk
Monday, March 16, 2026, 16:45–17:15, KH 01.020
A multi-ratio method for determination of the electric field from 2p states in transient argon discharges at atmospheric pressure — •Zdenek Bonaventura1, Zdenek Navratil1, Detlef Loffhagen2, Markus Becker2, and Tomas Hoder1,2 — 1Department of Plasma Physics And Technology, Masaryk University, Brno, Czech Republic — 2Leibniz Institute for Plasma Science and Technology, Greifswald, Germany
We present a theoretical analysis demonstrating that a multi-ratio optical emission spectroscopy (OES) approach can, in principle, be applied to determine the instantaneous mean electron energy and reduced electric field (E/N) in transient low-temperature argon discharges at atmospheric pressure, while also allowing recovery of the relative densities of the Ar1s5..2 states. The method is derived from an advanced reaction kinetic model for argon accounting for 23 species and 409 processes by means of a dominant-balance analysis used to identify negligible terms and define explicit validity conditions in terms of reduced electric field, pressure, and relative excited-state densities for simplified formulation. By combining simplified balance equations for pairs of Ar2p10...2 states, the dependence on the unknown electron density is eliminated, and densities of the Ar2p10...2 states appear only in mutual ratios. The influence of metastable and resonant states is incorporated through specific terms, whose impact on the method sensitivity is quantified.
Keywords: electric field; metastable density; diagnostics; spectroscopy