Study on helium atmospheric pressure plasma jet using collisional-radiative model

Abstract

The helium (He) non-thermal atmospheric pressure plasma jet (APPJ) source was configured, and the He spectra were measured by applying AC power to the source. A He collisional-radiative (CR) model was developed to investigate the He spectra obtained from the APPJ source. Different atmospheric pressure (AP) processes were evaluated, and the dominant processes among them that contribute to the He spectra were determined. The plasma parameters of the APPJ were determined using the He CR model, and the He spectra were successfully reproduced. The electron density was determined to be ∼2×1012 cm−3 between the electrodes of the APPJ, and ∼9×1011cm−3 outside the quartz tube, for a frequency and bias of an AC voltage source of 5 kHz and 10 kVp.p, respectively. A parametric study was performed to explain the behavior of the electron temperature and electron density of APPJ.

Determination of electron properties of a helium atmospheric pressure plasma jet with a grounded metallic target

“…The line intensity ratio (LIR) method combined with the He collisional-radiative (CR) model for an APPJ was applied in this study. [24] Using the CR model, the electron temperature and density in Section A were calculated to be 1.3-1.8 eV and 1.6-2.5 × 10 12 cm −3 , respectively, for which the LIRs of 3 1 D-2 1 P (667.8 nm)/3 1 S-2 1 P (728.1 nm), 3 1 S-2 1 P (728.1 nm)/3 3 S-2 3 P (706.5 nm), and 3 3 D-2 3 P (587.6 nm)/3 3 S-2 3 P (706.5 nm) were selected. The electron temperature and density determined using the continuum radiation were slightly lower than those computed using the CR model.…”

“…In addition, it has been reported that the electron temperature in an APPJ is less than 4 eV, and the electron density is sufficiently large to distinguish the continuum radiation in the plasma spectra. [21,24,40,41] Therefore, optical diagnostics using continuum radiation can be appropriate for determining the electron temperature and density of an APPJ.…”

“…These processes have been elucidated through studies of the electron properties, gas temperature, and particle densities in APPJs. [17][18][19][20][21][22][23][24][25] Further, many authors have investigated the mode transition of an APPJ from laminar to turbulent flow and emphasized the role of electrohydrodynamic effects when a target is placed in front of a quartz tube. [26][27][28][29][30][31] Computational investigations of an APPJ with a target have also been reported.…”

Application of Y–ZrO2 microtubes as dielectric barrier material in a He atmospheric pressure micro-plasma jet

“…Many applications of APPJs rely on the plasma production of active species [17,18] which is dependent on several parameters including the electric field strength [19][20][21]. While the knowledge of APPJs has advanced considerably [1], the characteristics of APPJs, such as optical emission, electron density, electron temperature and electric field strength, are still actively investigated [22][23][24][25][26].…”

Study of increment of emission intensity in a cold atmospheric pressure helium plasma jet using the ADAS

“…The CR model for neutral helium was further improved by Goto [25]. This model was also used by several researchers to study helium non-thermal atmospheric-pressure plasma jet [26]. The CR model of the ADAS code and database has been used for the study of the laser plasma, the tokamak plasma, etc.…”