Characterization of an N<sub>2</sub>flowing microwave post-discharge by OES spectroscopy and determination of absolute ground-state nitrogen atom densities by TALIF

Es-sebbar, Et.; Bénilan, Y.; Jolly, A.; Gazeau, M.‐C.

doi:10.1088/0022-3727/42/13/135206

Cited by 40 publications

(28 citation statements)

References 37 publications

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“…In the particular case of O and CO species, two‐photon absorption LIF (TALIF) is among the most widespread techniques . TALIF is based on a simultaneous absorption of two photons with equal energy, resulting in excitation of the lower atomic (or molecular) state of interest (generally the ground state), which is followed by fluorescence towards a lower intermediate state, according to

I_{T A L I F} = K n_{l} I_{L A S}^{2} a_{x},

where K is a factor taking into account the laser excitation and detection geometry, n l the density of the lower state, I LAS the laser intensity, and a x is branching ratio of the observed fluorescence (including the absorption, collisional depopulation, and spontaneous emission coefficients). It is worth mentioning that two‐photon absorption cross sections are normally few orders of magnitude lower that those corresponding to absorption of a single photon.…”

Section: Experimental Setup and Optical Diagnostic Techniquesmentioning

confidence: 99%

Understanding CO₂ decomposition in microwave plasma by means of optical diagnostics

Silva

Britun

Snyders

2016

Plasma Processes & Polymers

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The growing interest to plasma‐based greenhouse gas decomposition requires the knowledge of the different kinetic mechanisms inherent in CO2 discharges and post‐discharges. This automatically involves extensive plasma diagnostics research work. Among different types of plasma diagnostics, the ones based on optical spectroscopy are of particular relevance due to their non‐intrusiveness. The recent progress in optical diagnostics of plasma‐assisted CO2 decomposition process is discussed in this work. A microwave surfaguide discharge operating at 2.45 GHz in several CO2‐containing mixtures was investigated. Optical emission spectroscopy is used to characterize the discharge area of the reactor in terms of fundamental plasma parameters. At the same time, two‐photon absorption laser‐induced fluorescence is applied for investigation of oxygen and carbon monoxide concentrations in the post‐discharge.

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I_{T A L I F} = K n_{l} I_{L A S}^{2} a_{x},

Section: Experimental Setup and Optical Diagnostic Techniquesmentioning

confidence: 99%

Understanding CO₂ decomposition in microwave plasma by means of optical diagnostics

Silva

Britun

Snyders

2016

Plasma Processes & Polymers

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“…This expected water contamination is discussed in the 3.1 Section. So far, the electronic features of the Nebulotron plasma setup have not been characterized yet but, as the volume of the plasma is much smaller than for the PAMPRE experiment, with a similar input power (30 W, Table 1), the temperature of neutral gases and the electron density in the Nebulotron setup are expected to be higher than in the PAMPRE plasma (Fridman, 2008, Es-Sebbar et al, 2009, Gries et al, 2009).…”

Section: The Nebulotron Experimentsmentioning

confidence: 99%

Nitrogen isotopic fractionation during abiotic synthesis of organic solid particles

Kuga

Carrasco

Marty

et al. 2014

Earth and Planetary Science Letters

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The formation of organic compounds is generally assumed to result from abiotic processes in the Solar System, with the exception of biogenic organics on Earth. Nitrogenbearing organics are of particular interest, notably for prebiotic perspectives but also for overall comprehension of organic formation in the young solar system and in planetary atmospheres. We have investigated abiotic synthesis of organics upon plasma discharge, with special attention to N isotope fractionation. Organic aerosols were synthesized from N 2 -CH 4 and N 2 -CO gaseous mixtures using low-pressure plasma discharge experiments, aimed at simulating chemistry occurring in Titan's atmosphere and in the protosolar nebula, respectively. The nitrogen content, the N speciation and the N isotopic composition were analyzed in the resulting organic aerosols. Nitrogen is efficiently incorporated into the synthesized solids, independently of the oxidation degree, of the N 2 content of the starting gas mixture, and of the nitrogen speciation in the aerosols. The aerosols are depleted in 15 N by 15-25 ‰ relative to the initial N 2 gas, whatever the experimental setup is. Such an isotopic fractionation is attributed to mass-dependent kinetic effect(s).Nitrogen isotope fractionation upon electric discharge cannot account for the large N isotope variations observed among solar system objects and reservoirs. Extreme N isotope signatures in the solar system are more likely the result of self-shielding during N 2 photodissociation, exotic effect during photodissociation of N 2 and/or low temperature ionmolecule isotope exchange. Kinetic N isotope fractionation may play a significant role in the

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“…In the conditions described above for the DC discharge (nN(4S)=2.5±0.27 x 10 13 cm -3 ), the fs-TALIF signals measured inside the discharge yield a SNR746=17.5, SNR744=10, SNR742=5. This corresponds to a detection limit of ~ 10 12 cm -3 , two orders of magnitude lower than previously reported for ns-TALIF 16,17,22 .…”

Section: A Characterization Of the DC Dischargementioning

confidence: 59%

Ground-State Atomic Nitrogen Measurements using fs-TALIF in High-Pressure NRP Discharges

Dumitrache

Gallant

Stancu

et al. 2020

AIAA Scitech 2020 Forum

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Measurements of ground state atomic nitrogen inside of a nanosecond repetitively pulsed (NRP) discharge operating at pressures between 0.1-5 bar are performed using a femtosecond two-photon absorption laser induced fluorescence (fs-TALIF) technique. The main goal of this work is to develop a quench-free diagnostic technique which would allow measurements at elevated pressures with high spatial and temporal resolution. Quantitative information is extracted from the TALIF signal via a novel calibration technique based on direct absorption measurements performed in a low-pressure DC discharge. The VUV measurements were done at the Soleil synchrotron facility using their unique high-resolution Fourier-transform spectrometer (⁄ =). During this preliminary work, fs-TALIF measurements of N(4 S) are demonstrated in the post-discharge of the NRP between 1-500 µs after the nanosecond pulse. A maximum number density of N-atoms of × was measured at 1 µs after the pulse when the discharge was operated at 1 bar in pure nitrogen. Importantly, the limit of detection of the fs-TALIF technique was determined to be ()~. This is approximately two orders of magnitude lower than previously reported by ns-TALIF.

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Characterization of an N₂flowing microwave post-discharge by OES spectroscopy and determination of absolute ground-state nitrogen atom densities by TALIF

Cited by 40 publications

References 37 publications

Understanding CO₂ decomposition in microwave plasma by means of optical diagnostics

Understanding CO₂ decomposition in microwave plasma by means of optical diagnostics

Nitrogen isotopic fractionation during abiotic synthesis of organic solid particles

Ground-State Atomic Nitrogen Measurements using fs-TALIF in High-Pressure NRP Discharges

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Characterization of an N2flowing microwave post-discharge by OES spectroscopy and determination of absolute ground-state nitrogen atom densities by TALIF

Cited by 40 publications

References 37 publications

Understanding CO2 decomposition in microwave plasma by means of optical diagnostics

Understanding CO2 decomposition in microwave plasma by means of optical diagnostics

Nitrogen isotopic fractionation during abiotic synthesis of organic solid particles

Ground-State Atomic Nitrogen Measurements using fs-TALIF in High-Pressure NRP Discharges

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Characterization of an N₂flowing microwave post-discharge by OES spectroscopy and determination of absolute ground-state nitrogen atom densities by TALIF

Understanding CO₂ decomposition in microwave plasma by means of optical diagnostics

Understanding CO₂ decomposition in microwave plasma by means of optical diagnostics