The density profiles of N2() and N2() in the Pink Afterglow of the DC nitrogen flowing discharge

Levaton, J.; Amorim, J.

doi:10.1016/j.chemphys.2014.02.019

Cited by 10 publications

(25 citation statements)

References 34 publications

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“…The singlet species account for vibrational states as source generation mechanisms. This VDF heating effect is the same one that occurs in the generation of the pink afterglow phenomenon in the nitrogen flowing post-discharge [9][10][11][12][13][14][15][16].…”

Section: Discussionmentioning

confidence: 59%

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Neutral and Excited Molecules and Atoms Densities in the Positive Column of Flowing N2 DC Discharges

2020

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We investigated flowing N 2 DC discharges both experimentally and theoretically. The discharge gas and N 2 (X 1 Σ + g) vibrational temperatures, electron density (n e), reduced electric field (E/N), and radiative state densities were measured by optical emission spectrometry (OES) and Langmuir double probes. We formulated a discharge kinetic numerical model to calculate the densities of nitrogen species as functions of the gas residence time. We combine the experimental parameters measured in the discharge with the kinetic model to analyze different discharge conditions where E/N varies significantly. First, we analyzed the measured and calculated radiative states densities and N 2 (X 1 Σ + g) vibrational distributions at the end of the positive column. Results show good agreement between calculated and measured parameters. Then, we studied the excited molecular species densities, and neutral and excited atoms densities as functions of the discharge gas residence time. This work presents for the first time the temporal densities of excited molecular and atomic states from 10 −9 to 10 −1 s discharge residence times, calculated for experimental conditions where n e presents a low variation and E/N varies from high (94 Td) to relatively low values (48 Td). The discharge experimental conditions are discharge current of 60 mA, gas pressure of 230-530 Pa, and gas flow rate of 0.9 Slm −1. Keywords Neutral and excited atoms density. Neutral and excited molecule density. Nitrogen flowing discharges

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Section: Discussionmentioning

confidence: 59%

“…, p is the gas pressure in Torr) [9]. This procedure to obtain the electron density was utilized in several of our works on nitrogen discharges and post-discharges [8,[10][11][12][13][14][15][16][17][18]. We utilized high purity N 2 gas (99.999%) in this study.…”

Section: Experimental Setup and Resultsmentioning

confidence: 99%

Neutral and Excited Molecules and Atoms Densities in the Positive Column of Flowing N2 DC Discharges

2020

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“…The pure nitrogen flowing post-discharges were also intensely studied in the last decades [6][7][8][9][10][11][12][13][14][15][16]. These studies concern the pink afterglow or short-lived afterglow phenomenon.…”

Section: Introductionmentioning

confidence: 99%

“…These studies concern the pink afterglow or short-lived afterglow phenomenon. The pink afterglow phenomenon is a nitrogen plasma occurring in the post-discharge region, where reionization and re-excitation of species occur for some experimental conditions of gas flow rate, discharge power (SW or RF discharge [6][7][8]11]), or discharge current (DC discharge [9,10,[12][13][14][15][16]), and gas pressure. The interesting fact in this phenomenon is that ionization and excitation of species occur outside the external zone of the electric field influence of the discharge, in the post-discharge region.…”

Section: Introductionmentioning

confidence: 99%

“…The re-ionization and re-excitation of nitrogen species are driven from the flow of vibrational quanta through the N 2 (X 1 Σ + g , v) vibrational states via vibrational-vibrational (V-V) exchange reactions between these molecules. The vibrational quanta flux populates the intermediate and high N 2 (X 1 Σ + g , v) vibrational states which become the precursors of excitation [12,14], dissociation [13], and ionization [9,15,16] physical-chemical processes in the post-discharge, sustaining the plasma.…”

Section: Introductionmentioning

confidence: 99%

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Study of ionization and ion transfer rates in flowing N₂ DC discharges and post-discharges

Levaton¹,

Klein²,

Amorim³

et al. 2021

J. Phys. D: Appl. Phys.

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In this work, we studied the ionization and ion transfer rates in flowing nitrogen DC discharges and post-discharges. Two different experimental set-ups and conditions for the flowing nitrogen discharges were analyzed. The first experimental set-up includes a post-discharge tube where the pink afterglow phenomenon was detected. Two well-established discharge and post-discharge kinetic numerical models we had previously developed to study the nitrogen flowing DC discharges and post-discharges were employed to calculate the rates for our experimental conditions. We analyzed 18 ionization and nine ion transfer mechanisms for N + , N 2 + , N 3 + , and N 4+ ions in the discharges and post-discharges. We observed that the electron density of the discharges, which varies by one order of magnitude, plays a major role in the rates behavior for the two experimental set-ups. Moreover, we observed that the rates found in the pink afterglow phenomenon are relevant when compared to rates found in the discharges. The important role of molecular metastable Penning ionization and atoms and molecules associative ionization appear in the ionization rates of the discharges. It is also shown that ion transfer mechanisms play a crucial role in the ions densities distribution found in the discharges and post-discharges. This work brings an original comparative study of ionization and ion transfer rates for experimental flowing nitrogen DC positive columns and pink afterglow post-discharge. This is the first time that a detailed combined experimental and theoretical analysis on the ionization and ion transfer rates is carried out for nitrogen flowing DC positive columns and pink afterglow plasma.

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Combined Application of Optical Emission Spectroscopy and Kinetic Numerical Modelling to Determine the Ions Densities in a Flowing N2 Post-Discharge

Levaton

Klein

Binder

2018

Plasma Chem Plasma Process

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The density profiles of N2() and N2() in the Pink Afterglow of the DC nitrogen flowing discharge

Cited by 10 publications

References 34 publications

Neutral and Excited Molecules and Atoms Densities in the Positive Column of Flowing N2 DC Discharges

Neutral and Excited Molecules and Atoms Densities in the Positive Column of Flowing N2 DC Discharges

Study of ionization and ion transfer rates in flowing N₂ DC discharges and post-discharges

Combined Application of Optical Emission Spectroscopy and Kinetic Numerical Modelling to Determine the Ions Densities in a Flowing N2 Post-Discharge

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The density profiles of N2() and N2() in the Pink Afterglow of the DC nitrogen flowing discharge

Cited by 10 publications

References 34 publications

Neutral and Excited Molecules and Atoms Densities in the Positive Column of Flowing N2 DC Discharges

Neutral and Excited Molecules and Atoms Densities in the Positive Column of Flowing N2 DC Discharges

Study of ionization and ion transfer rates in flowing N2 DC discharges and post-discharges

Combined Application of Optical Emission Spectroscopy and Kinetic Numerical Modelling to Determine the Ions Densities in a Flowing N2 Post-Discharge

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Study of ionization and ion transfer rates in flowing N₂ DC discharges and post-discharges