Absolute nitrogen atom density measurements by two-photon laser-induced fluorescence spectroscopy in atmospheric pressure dielectric barrier discharges of pure nitrogen

In this paper, two-photon absorption laser induced fluorescence spectroscopy is used to follow the nitrogen atom density in flowing dielectric barrier discharges fed with pure nitrogen and operating at atmospheric pressure. Two different dielectric barrier discharge regimes are investigated: the Tow...

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Bibliographic Details
Published in:Journal of applied physics 2009-10, Vol.106 (7), p.073302-073302-7
Main Authors: Es-Sebbar, Et-Touhami, Sarra-Bournet, Christian, Naudé, Nicolas, Massines, Françoise, Gherardi, Nicolas
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ABSORPTION
ATMOSPHERIC PRESSURE
BOSONS
DIELECTRIC MATERIALS
ELECTRIC DISCHARGES
ELEMENTARY PARTICLES
ELEMENTS
EMISSION
EMISSION SPECTROSCOPY
Engineering Sciences
FLUID FLOW
FLUORESCENCE
FLUORESCENCE SPECTROSCOPY
GAS FLOW
IMPURITIES
LASERS
LUMINESCENCE
MANY-BODY PROBLEM
MASSLESS PARTICLES
MATERIALS
NITROGEN
NONMETALS
PHOTON EMISSION
PHOTONS
PLASMA DENSITY
PLASMA DIAGNOSTICS
PLASMA IMPURITIES
RECOMBINATION
SORPTION
SPECTROSCOPY
THREE-BODY PROBLEM
TOWNSEND DISCHARGE
WALL EFFECTS
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Summary:In this paper, two-photon absorption laser induced fluorescence spectroscopy is used to follow the nitrogen atom density in flowing dielectric barrier discharges fed with pure nitrogen and operating at atmospheric pressure. Two different dielectric barrier discharge regimes are investigated: the Townsend regime, which is homogeneous although operating at atmospheric pressure, and the more common filamentary regime. In both regimes, densities as high as 3 × 10 14 ∕ cm 3 are detected. However, the N atoms kinetic formation depends on the discharge regime. The saturation level is reached more rapidly with a filamentary discharge. For a given discharge regime, the N atom density depends strongly on the energy dissipated in the plasma between the gas inlet and the measurement position, whether the energy is varied by varying the position of the measurements, the gas flow, or the dissipated power. Experiments performed in the postdischarge show that the N atom decay cannot be simply attributed to three-body recombination of atomic nitrogen with nitrogen molecules, meaning that other mechanisms such as surface recombination or gas impurities play a role.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.3225569