Determination of the reduced electric field in surface dielectric barrier discharge plasmas

2021 ◽  
Vol 103 (3) ◽  
pp. 35-44
Author(s):  
А.А. Mutalip ◽  
◽  
Y.А. Ussenov ◽  
А.K. Akildinova ◽  
М.K. Dosbolayev ◽  
...  
Keyword(s):  
Electric Field ◽  
Emission Spectrum ◽  
Barrier Discharge ◽  
Block Diagram ◽  
Average Energy ◽  
Optical Emission ◽  
Spectral Lines ◽  
Surface Barrier ◽  
Optical Emission Spectrum

In this paper, the experimental determination of the reduced electric field (E/n) in plasma of dielectric coplanar surface barrier discharge (DCSBD) at atmospheric pressure was demonstrated. The plasma characteristics and the experimental setup properties were described, and the optical emission spectrum of the plasma was also measured. The results of optical emission spectroscopy showed the presence of nitrogen molecular bands in the emission spectrum of DCSBD. In particular, the second positive and the first negative systems, as well as low intensity OH and NO lines were identified. The main transport properties of electrons, such as mobility, mean average energy, and diffusion coefficients were calculated using the BOLSIG+ open source software. The dependence of the ratio of intensities of the nitrogen spectral lines on the reduced electric field, the dependence of the E/n on plasma power, and the dependence of the electron energy distribution function (EEDF) on E/n were obtained. An algorithm in the form of a block diagram for determining the reduced electric field by the BOLSIG + program and experimentally measured spectral line intensities are presented. The utilized method is quite simple, accessible and versatile.

scholarly journals Discharge and Optical Emission Spectrum Characteristics of a Coaxial Dielectric Barrier Discharge Plasma-Assisted Combustion Actuator

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Pengfei Liu ◽  
Liming He ◽  
Bingbing Zhao
Keyword(s):  
Emission Spectrum ◽  
Discharge Plasma ◽  
Barrier Discharge ◽  
Optical Emission ◽  
Input Voltage ◽  
Spectral Lines ◽  
Dielectric Barrier Discharge Plasma ◽  
Optical Emission Spectrum ◽  
Dielectric Barrier ◽  
Barrier Discharge Plasma

A coaxial dielectric barrier discharge plasma-assisted combustion actuator (DBD-PACA) system was set up to study its discharge and optical emission spectrum (OES) characteristics in space in this paper. Results showed that each discharge cycle can be divided into four stages: a, b, c, and d. Discharge-on only occurred in stages b and d. Comparatively, the discharge intensity was larger in stage d due to the memory effect of excited electrons. Moreover, Lissajous figure and current-voltage methods were utilized to calculate the power of the coaxial DBD-PACA, and both methods produced roughly similar results. The power presented an upward trend with increasing input voltage and airflow rate. In addition, numerous second positive system (SPS) excited nitrogen molecules were detected from the OES signals. The intensity of the spectral lines (297.54 nm, 315.76 nm, 336.96 nm, and 357.56 nm) first increased, then maintained, and then increased rapidly with the increased radius; however, the intensity of the spectral lines (380.34 nm, 405.80 nm, and 434.30 nm) basically remained unchanged, then increased, and finally decreased with the increased radius. The vibrational temperature first decreased quickly and then increased and reached the minimum at r = 18 mm with the increased radius. The vibrational temperatures at all collection points decreased with the increased input voltage. However, within the range of 0–280 L/min, when r was lower than 15 mm, the vibrational temperatures first increased rapidly and then decreased slowly; when r was greater than 15 mm, the vibrational temperatures first increased and then basically remained stable.

An experimental determination of the dipole moments of the X(1Σ) and A(1Π) states of the BH molecule

1969 ◽  
Vol 47 (11) ◽  
pp. 1155-1158 ◽  
Author(s):  
Ritchie Thomson ◽  
F. W. Dalby
Keyword(s):  
Emission Spectrum ◽  
Experimental Determination ◽  
Electric Fields ◽  
Discharge Tube ◽  
Dipole Moments ◽  
Optical Emission ◽  
Optical Emission Spectrum ◽  
Stark Effects ◽  
High Electric Fields

The optical emission spectrum of the BH radical produced in a discharge tube designed to give high electric fields shows Stark effects. From these, the dipole moments of the X(1Σ+) and A(1Π) states are determined to be (1.27 ± 0.21) D and (0.58 ± 0.04) D, respectively.

Searching for 3D effects in the optical, high spectral resolution emission spectrum of KELT-9b

2021 ◽  
Author(s):  
Lorenzo Pino ◽  
Matteo Brogi ◽  
Jean-Michel Désert ◽  
Emily Rauscher
Keyword(s):  
Emission Spectrum ◽  
Spectral Resolution ◽  
Planet Formation ◽  
Emission Spectra ◽  
Optical Emission ◽  
High Spectral Resolution ◽  
Optical Emission Spectrum ◽  
Hot Jupiters ◽  
Atmospheric Structure ◽  
3D Effects

<p>Ultra-hot Jupiters (UHJs; T<sub>eq</sub> ≥ 2500 K) are the hottest gaseous giants known. They emerged as ideal laboratories to test theories of atmospheric structure and its link to planet formation. Indeed, because of their high temperatures, (1) they likely host atmospheres in chemical equilibrium and (2) clouds do not form in their day-side. Their continuum, which can be measured with space-facilities, can be mostly attributed to H- opacity, an indicator of metallicity. From the ground, the high spectral resolution emission spectra of UHJs contains thousands of lines of refractory (Fe, Ti, TiO, …) and volatile species (OH, CO, …), whose combined atmospheric abundances could track planet formation history in a unique way. In this talk, we take a deeper look to the optical emission spectrum of KELT-9b covering planetary phases 0.25 - 0.75 (i.e. between secondary eclipse and quadrature), and search for the effect of atmospheric dynamics and three-dimensionality of the planet atmosphere on the resolved line profiles, in the context of a consolidated statistical framework. We discuss the suitability of the traditionally adopted 1D models to interprete phase-resolved observations of ultra-hot Jupiters, and the potential of this kind of observations to probe their 3D atmospheric structure and dynamics. Ultimately, understanding which factors affect the line-shape in UHJs will also lead to more accurate and more precise abundance measurements, opening a new window on exoplanet formation and evolution.</p>

Time Evolution of Optical Emission Spectrum of a Hg-HID Lamp Exposed to X-ray

2010 ◽  
Vol 30 (4) ◽  
pp. 449-459 ◽  
Author(s):  
N. A. Harabor ◽  
A. Harabor ◽  
I. Palarie ◽  
I. M. Popescu ◽  
G. Zissis
Keyword(s):  
Emission Spectrum ◽  
Time Evolution ◽  
Optical Emission ◽  
Optical Emission Spectrum ◽  
X Ray

scholarly journals SPECTROSCOPY PECULIARITIES OF ELECTRIC ARC DISCHARGE PLASMA WITH IRON VAPOURS

2021 ◽  
pp. 171-175
Author(s):  
A. Murmantsev ◽  
A. Veklich ◽  
V. Boretskij
Keyword(s):  
Discharge Plasma ◽  
Arc Discharge ◽  
Line Emission ◽  
Plasma Temperature ◽  
Optical Emission ◽  
Plasma Source ◽  
Electric Arc ◽  
Spectral Lines ◽  
Electric Arc Discharge

This work is devoted to spectroscopy peculiarities of electric arc discharge plasma with iron vapours. The solution of the main issue of optical emission spectroscopy, namely, selection of iron spectral lines, to study the parameters of non-uniform and non-steady-state plasma source, was considered within this paper. Specifically, the Boltzmann plots technique was used for detailed analysing of application possibility of Fe I spectral lines as well as for determination of plasma temperature. The spatial profiles of selected spectral line emission intensities were used to measure the radial distributions of plasma temperature of free-burning arc discharge between consumable electrodes at 3.5 A.

Development of laser ablation dielectric barrier discharge optical emission spectrometry (LA-DBD-OES) for direct determination of sulphur and chloride in condensed phase and its application in pharmaceutical analysis

The Analyst ◽  
2021 ◽  
Author(s):  
Xuelu Ding ◽  
Chaoqun Geng ◽  
Suhan Zhai ◽  
Xiaoyan Cao ◽  
Zhenyan Shi ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Dielectric Barrier Discharge ◽  
Organic Compounds ◽  
Pharmaceutical Analysis ◽  
Barrier Discharge ◽  
Direct Determination ◽  
Optical Emission ◽  
Emission Spectrometry ◽  
Dielectric Barrier

An infrared laser (808 nm) has been coupled with dielectric barrier discharge (DBD) for optical emission spectrometric determination of S and Cl in organic compounds. The use of a continuous...

Methodology for elemental analysis of a mineral fertilizer, some of its raw materials and limestone using microwave-induced plasma optical emission spectrometry (MIP OES)

2020 ◽  
Vol 12 (20) ◽  
pp. 2638-2644 ◽  
Author(s):  
Alexandre Müller ◽  
Dirce Pozebon ◽  
Anderson Schwingel Ribeiro
Keyword(s):  
Raw Materials ◽  
Mineral Fertilizer ◽  
Optical Emission ◽  
Optical Emission Spectrometry ◽  
Spectral Lines ◽  
Emission Spectrometry ◽  
Microwave Induced Plasma ◽  
Plasma Optical Emission Spectrometry ◽  
Mip Oes

Microwave-induced plasma optical emission spectrometry (MIP OES) allowed the determination of 19 elements in a complex sample matrix. Spectral lines and sample preparation procedures were investigated.

Spectroscopic Study of Pulsed Laser Induced Plasma from Aluminum Surface

1998 ◽  
Vol 526 ◽  
Author(s):  
Y. F. Lu ◽  
Z. B. Tao ◽  
M. H. Hong ◽  
D.S.H. Chan ◽  
T.S. Low
Keyword(s):  
Spectroscopic Study ◽  
Laser Energy ◽  
Plasma Temperature ◽  
Optical Emission ◽  
Spectral Lines ◽  
Aluminum Surface ◽  
Spontaneous Radiation ◽  
Incident Laser ◽  
Optical Emission Spectrum ◽  
Laser Fluences

AbstractOptical emission spectrum of aluminum plasma induced by a 1064 nm Nd:YAG laser is investigated by an Optical Multichannel Analyzer (OMA). Spectroscopic study shows that more number of Al, Al+, and Al++ spectral lines can be observed with increasing the incident laser fluence. Al, Al+, Al++ spectral lines are also observed successively with high fluence. The atomic spontaneous radiation is analyzed to interpret the calibrated plasma spectrum. The laser energy threshold for the appearance of excited Al, Al+, and Al++ spectral lines are about 0.8, 1.0 and 1.5 J/cm2 respectively. Assuming LTE (Local Thermodynamic Equilibrium) conditions, the plasma density is derived to be in the range of 0.7×1017 to 2×1017 cm-3 from the profiles of Al+ (358.7 and 286.1 nm) spectral lines with different gated times and incident laser fluences. The plasma temperature is also estimated to be 4000 ~ 8000 K, from relative intensities of two different Al I spectral lines (309.2 and 396.2 nm) with different fluence.

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