Experimental and calculated N(<sup>4</sup>S) temporal density profile in the N<sub>2</sub>flowing post-discharge

Levaton, J.; Amorim, J.; Franco, Douglas Wagner

doi:10.1088/0022-3727/38/13/019

Cited by 26 publications

(21 citation statements)

References 37 publications

(52 reference statements)

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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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“…In Ar-N 2 gas mixtures, the N 2 (C, v ) states are enhanced by reaction (4) as was discussed in the section 3. Also, the electron collisions and pooling reactions between nitrogen metastable states [34,35] have to be taken into account. The results in figure 6 indicate that all these factors contribute to increasing the N 2 (C, v ) vibrational temperature in Ar-xN 2 gas mixtures at a low percentage of nitrogen.…”

Section: The Vibrational Temperaturementioning

confidence: 99%

Determination of the vibrational, rotational and electron temperatures in N₂and Ar–N₂rf discharge

Britun¹,

Gaillard²,

Ricard³

et al. 2007

J. Phys. D: Appl. Phys.

164

111

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In order to characterize a nonequilibrium molecular plasma from the point of view of translational, vibrational and rotational degrees of freedom and their interaction, the characteristic temperatures of such a plasma were measured in an ICP rf reactor. Both pure nitrogen and argon–nitrogen mixture plasmas were examined for this purpose.The experimental results of rotational (Tr), vibrational (Tv) and electron (Te) temperatures are presented. Vibrational and rotational temperatures were measured as a function of nitrogen content for both E and H modes of ICP discharge using a power range of 45–200 W and pressure range of 2.6–13.3 Pa. Additionally, the pressure dependence of electron temperature in a pure nitrogen discharge was studied. Results show that rotational temperature is ≈370 K for E mode and ≈470 K for H mode and almost does not depend on either the applied rf power or the nitrogen content in the discharge. Vibrational temperature groups in the range 5000–12 000 K increase with applied rf power and constantly decay with an increase of nitrogen content. The measured values and behaviour of electron temperature are comparable with those for the positive column of the dc glow discharge. The results also prove that these three temperatures obey the classical inequality Te > Tv > Tr, as well as clarifying the differences in both vibrational and rotational temperature for different modes of the ICP discharge.

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“…These bands correspond to an early afterglow produced by collisions of the N2(X, v ) and N2(A, a ′) metastable molecules 13. The vibrational distribution of the N2 bands has been analyzed by the method described in ref 14.…”

Section: Characterization Of N2 Post Discharge With Porous Membranesmentioning

confidence: 99%

Interaction of N Atoms Through Porous Membranes in Nitrogen Flowing Post Discharges

Villeger

Sixou²,

Durand

et al. 2007

Plasma Process. Polym.

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Results of investigations conducted with membranes of several pore diameters are presented: nylon (5 µm), PDVF(1 µm), and polysulfones (1.2 and 3 µm) exposed to a N2 flowing (1 Ln · min−1) microwave (100 W) post discharge, produced at low gas pressure: 130 to 4 000 Pa (1 to 30 Torr). The transmissions of N atoms through these membranes were measured from the intensity variation of the N2, 1st position afterglow before and after the membranes. It appeared that N atoms penetrate and cross the membranes with a transmission factor varying from 20 to 50% for nylon and from 50 to 100% for PDVF and from 33 to 100% for polysulfones during the exposure time (<30 min). Such variations of transmission factors are the results of membrane etching by N atoms.

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Experimental and calculated N(⁴S) temporal density profile in the N₂flowing post-discharge

Cited by 26 publications

References 37 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

Determination of the vibrational, rotational and electron temperatures in N₂and Ar–N₂rf discharge

Interaction of N Atoms Through Porous Membranes in Nitrogen Flowing Post Discharges

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Experimental and calculated N(4S) temporal density profile in the N2flowing post-discharge

Cited by 26 publications

References 37 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

Determination of the vibrational, rotational and electron temperatures in N2and Ar–N2rf discharge

Interaction of N Atoms Through Porous Membranes in Nitrogen Flowing Post Discharges

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Experimental and calculated N(⁴S) temporal density profile in the N₂flowing post-discharge

Determination of the vibrational, rotational and electron temperatures in N₂and Ar–N₂rf discharge