Experimental investigation of the electron energy distribution function (EEDF) by Thomson scattering and optical emission spectroscopy

Abstract

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Causes of plasma column contraction in surface-wave-driven discharges in argon at atmospheric pressure

“…The results we present here also shed light on the interpretation of electron temperature measurements of contracted surface-wave discharges carried out by means of Thomson Scattering [21][22][23]. The experimental data show that the electron temperature increases significantly towards the border as the electron density decreases whenever the discharge is in the contracted regime.…”

“…gives the most important contribution for the light scattering -may be approximated by a straight line, even in the worst cases. The contribution of more energetic electrons (u e > 2 eV) in the tail of the Doppler broadened scattering profile -which could possibly show the deviation from the equilibrium EEDF -is obscured by the signal noise [22]. That is why we may define the Thomson temperature as the temperature of the Maxwellian which best fits the non-equilibrium EEDF in the energy interval from 0 eV to 2 eV (see Fig.…”

Afterglow of Argon Plasmas with H2, O2, N2, and CO2Admixtures Observed by Thomson Scattering

“…However, as the density distribution of electrons decreases exponentially with energy, only the lower part of the energy range exhibits a sufficient strong signal to noise ratio, see Figure . In the conditions of the present study, we observe the bulk of the EEDF and the determined T e represents the mean electron energy . Analyzing the TS results in our experiments we could not find deviations from a Maxwellian EEDF in the relatively low energy range that was detectable.…”

“…Since the rate coefficient k ion ( T e ) strongly depends on the electron temperature it is clear that at higher argon pressures the electron temperature will be smaller. The reason is that pressure enhancement leads to reduced diffusion‐losses, so that the T e needed to sustain the plasma can be lower . The effect of volume recombination on the charged particle balance is equally important to diffusion at about 10 mbar .…”

Measurement of electron density and electron temperature of a cascaded arc plasma using laser Thomson scattering compared to an optical emission spectroscopic approach

“…When the electron energy distribution function (EEDF) has a Maxwellian distribution, the scattered spectrum will be Gaussian in shape which has been confirmed in figure 6(a). A Maxwellian distribution will lead to [26] dl…”