Determination of the Electron Temperature of Atmospheric Pressure Argon Plasmas by Absolute Line Intensities and a Collisional Radiative Model

Abstract

The electron temperature in atmospheric argon plasmas created by a DBD jet is determined using a combination of Absolute Line Intensity (ALI) measurements and a collisional radiative model (CRM). The ALI measurements have been performed to determine the densities of the states in the 4p level. In addition, the ground state density is taken into account, which is found via the pressure and the gas temperature. The density ratio of the ground state and 4p state gives a value of the excitation temperature, which by means of the CRM is transformed into the electron temperature. With this method, the electron temperature in the active zone of a pure argon plasma is found to be 1.27 eV which is significantly higher than the experimental value reported by others. An error analysis shows that the relative error in the electron temperature obtained in this way is about 5%. In the afterglow, the temperature decreases gradually to about 0.88 eV. The addition of 2% O2 leads to a decrease in electron temperature of about 5%.

Inactivation of Biofilms Using a Low Power Atmospheric Pressure Argon Plasma Jet; the Role of Entrained Nitrogen

“…The values of e for all relevant transitions are determined in an absolute way, i.e., after calibrating the detected radiation with that of a standard source. Herein we applied the same procedure as that described in Taghizadeh et al Two spectral arrangements were used; one for the calibration of the volume averaged radiation, the other to get the axial resolution.…”

“…This procedure gives the Absolute Emission Rates (AER) of radiative transitions and the absolute densities of emitting species as a function of axial position. For more details we refer to Taghizadeh et al …”

Determination of the Electron Density in an Argon Plasma Jet Using Absolute Measurements of Continuum Radiation

“…This spectrum, obtained after dark current subtraction, shows lines and bands superimposed on a continuum. The Ar 4p lines situated in the interval are used to determine the electron temperature . The bands were studied in in relation with the ability of the plasma source to destroy biofilms.…”

“…The Ar 4p lines situated in the interval 690 < l < 850 nm are used to determine the electron temperature. [1] The bands were studied in [12] in relation with the ability of the plasma source to destroy biofilms. In this study, we are especially interested in the continuum as it delivers the electron density n e .…”

“…This paper is devoted to the determination of the electron density for plasmas created by a DBD plasma jet driven with sinusoidal voltages in the range of 7–20 kV pp and in the frequency range of 10–100 kHz. The plasmas which were described in Sarani et al and Taghizadeh et al are small in size and high in gas density, so that it is difficult to apply the H β and Thomson scattering method. Therefore, we will employ the continuum radiation method.…”