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Ar(1s 5 ) absolute radial densities in a ns‐pulsed argon plasma jet impinging on dielectric targets at floating potential – plasma action on organic molecules
Author(s) -
Gazeli Kristaq,
Vazquez Thomas,
AlHomsi Sara,
Bauville Gérard,
BlinSimiand Nicole,
Bourville Blandine,
Fleury Michel,
Jeanney Pascal,
Neveu Olivier,
Pasquiers Stéphane,
Santos Sousa João
Publication year - 2018
Publication title -
plasma processes and polymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 74
eISSN - 1612-8869
pISSN - 1612-8850
DOI - 10.1002/ppap.201800080
Subject(s) - plasma , argon , analytical chemistry (journal) , atomic physics , chemistry , plasma diagnostics , number density , materials science , ion , physics , organic chemistry , quantum mechanics , chromatography , thermodynamics
The present work is devoted to the precise spatiotemporal mapping of the absolute density of Ar(1s 5 ) in a ns‐pulsed argon plasma jet. The plasma impinges on glass and alumina targets at floating potential placed 5 mm away from the reactor's nozzle. Under these conditions, diffuse discharges are established in the small gas gap. As so, the line‐of‐sight absolute density of Ar(1s 5 ) is effectively evaluated via laser absorption spectroscopy. The application of the Abel‐inversion is also demonstrated for different operating conditions leading to the precise radial mapping of the Ar(1s 5 ) absolute density. The influence of each target is studied for two gas flow rates, 0.3 and 0.4 l min −1 . The temporal density profiles over a voltage pulse period reveal two maxima related with the Ar(1s 5 ) production in the streamer head and in the residual diffuse plasma channel. Furthermore, the maximum Ar(1s 5 ) axial/radial density (∼10 13 − 3.5 × 10 14 cm −3 ) depends on the target material and gas flow rate. Finally, the plasma is proved to be very effective for the fast desorption of organic molecules (bibenzyl) deposited on both targets. The results obtained suggest that the desorption of bibenzyl is due to the production of high Ar(1s 5 ) densities at the close vicinity of the targets.