Production of O atoms in Ar-O2 and N2-O2 microwave flowing post-discharges

Ricard, A.; Monna, V.; Mozetič, Miran

doi:10.1016/s0257-8972(03)00405-5

Cited by 20 publications

(21 citation statements)

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“…In the flow of species from the plasma generation zone to the far post‐discharge of the reaction chamber most plasma species disappear, so the only species present were the excited vibration states of N 2 (X,V), N ( 4 S) atoms and N 2 molecules in their fundamental state 35. In N 2 + O 2 gas mixtures, in addition to the species mentioned originating from a pure N 2 post‐discharge, the following species are present: O 2 molecules, NO(B) radiative state, NO molecules and O atoms 36. Because pure O 2 post‐discharge is not light emitting, it was not possible to record any spectra.…”

Section: Resultsmentioning

confidence: 99%

Role of the Active Species of Plasmas Involved in the Modification of Textile Materials

Canal

Gaboriau

Molina

et al. 2007

Plasma Processes & Polymers

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The role of the active species involved in the superficial modification of natural and manmade fibers is discussed for the example of wool and PA6 fabrics treated by means of post‐discharge plasmas (N2, N2 + 23% O2, O2) to avoid UV radiation, ions, electrons and other species present in direct plasma discharges. The active species present in the N2 post‐discharge have been quantitatively and qualitatively evaluated by means of optical emission spectroscopy. Their action on the surface of the fibers has been analyzed by dynamic contact angle, revealing an improved wettability that has been attributed to the generation of new chemical groups and the reduction/elimination of the fatty layer on the surface of wool.

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Section: Resultsmentioning

confidence: 99%

Role of the Active Species of Plasmas Involved in the Modification of Textile Materials

Canal

Gaboriau

Molina

et al. 2007

Plasma Processes & Polymers

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“…The Oatoms density was determined in the post-discharge of an Ar-O 2 surface wave microwave discharge by titration by Ricard et al [19,20,21] and Belmonte et al [22], for selected discharge conditions and mixture composition. Recently, two further techniques have been developed for the measurement of O-atoms density, one spectroscopical diagnostic that is based on the emission spectra of the O 2 …”

Section: Introductionmentioning

confidence: 99%

“…The gas temperature is chosen to be 1000 K [26,35,36]. These conditions are close to the typical discharge conditions determining the afterglows used in the experimental plasma sterilization [1,21] and polymer treatment studies [3]. Other conditions will be additionally investigated, in order to better validate the model and to elucidate the role of heterogeneous processes.…”

Section: Introductionmentioning

confidence: 99%

Theoretical insight into Ar–O₂surface-wave microwave discharges

Kutasi

Guerra²,

Sá

2010

J. Phys. D: Appl. Phys.

104

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Abstract.A zero-dimensional kinetic model has been developed to investigate the coupled electron and heavy-particle kinetics in Ar-O 2 surface-wave microwave discharges generated in long cylindrical tubes, such as those launched with a surfatron or a surfaguide. The model has been validated by comparing the calculated electron temperature and species densities with experimental data available in the literature for different discharge conditions. Systematic studies have been carried out for a surfacewave discharge generated with 2.45 GHz field frequency in a 1 cm diameter quartz tube in Ar-O 2 mixture at 0.5-3 Torr pressures, which are typical conditions found in different applications. The calculations have been performed for the critical electron density n e =3.74×10 11 cm −3 . It has been found that the sustaining electric field decreases with Ar percentage in the mixture, while the electron kinetic temperature exhibits a minimum at about 80%Ar. The charged and neutral species densities have been calculated for different mixture compositions, from pure O 2 to pure Ar, and their creation and destruction processes have been identified. The O 2 dissociation degree increases with Ar addition into O 2 and dissociation degrees as high as 60% can be achieved. Furthermore, it has been demonstrated that the dissociation degree increases with the discharge tube radius, while decreases with the atomic surface recombination of O-atoms. The density of O − negative ions is very high in the plasma, the electronegativity of the discharge can be higher than 1, depending on the discharge conditions. §

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“…Recently, a method using NO titration for simultaneous measurement of N and O concentrations was reported [11] and then used [12,13]. It is carried out in the region where [NO] [N].…”

Section: Introductionmentioning

confidence: 99%

Simultaneous measurement of N and O densities in plasma afterglow by means of NO titration

Vašina

Kudrle

Tálský

et al. 2004

Plasma Sources Sci. Technol.

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In this work we describe a method based on NO titration that permits us to measure at the same time the absolute concentrations of N and O atoms in the gas phase. This method is suitable for low concentrations of oxygen atoms. We also discuss the validity of the titration method, especially the influence of the reaction time. It was used to study the influence of O 2 admixture on the degree of dissociation of nitrogen in the afterglow. The results of the NO titration technique were compared with those obtained by means of electron paramagnetic resonance and with the relative values determined from emission of N 2 (B 3 g-A 3 + u).

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Production of O atoms in Ar-O2 and N2-O2 microwave flowing post-discharges

Cited by 20 publications

References 10 publications

Role of the Active Species of Plasmas Involved in the Modification of Textile Materials

Role of the Active Species of Plasmas Involved in the Modification of Textile Materials

Theoretical insight into Ar–O₂surface-wave microwave discharges

Simultaneous measurement of N and O densities in plasma afterglow by means of NO titration

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Production of O atoms in Ar-O2 and N2-O2 microwave flowing post-discharges

Cited by 20 publications

References 10 publications

Role of the Active Species of Plasmas Involved in the Modification of Textile Materials

Role of the Active Species of Plasmas Involved in the Modification of Textile Materials

Theoretical insight into Ar–O2surface-wave microwave discharges

Simultaneous measurement of N and O densities in plasma afterglow by means of NO titration

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Product

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Theoretical insight into Ar–O₂surface-wave microwave discharges