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Proceedings Paper

Micro-plasmas as efficient generators of singlet delta oxygen
Author(s): Vincent Puech; Gerard Bauville; Bernard Lacour; Joao Santos Sousa; Leanne C. Pitchford; Michel Touzeau
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Paper Abstract

This paper discusses the possibility of producing high concentrations of O2(a1Δg) states at pressures up to atmospheric in rare-gas/oxygen/NO mixtures by using micro-plasmas. Micro-plasmas refer to electric discharges created in very small geometries which have been proven able to operate in DC mode at high pressure and high power loading without undergoing any glow to arc transition. The so-called Micro Cathode Sustained Discharge (MCSD), which is a three-electrode configuration using a Micro Hollow Cathode Discharge (MHCD) as a plasma cathode, can be operated as a non-self-sustained discharge with low values of the reduced electric field and of the gas temperature. As a result, these MCSDs can efficiently generate large amounts of singlet delta oxygen. In Ar/O2/NO mixtures, at an oxygen partial pressure of 10 mbar, high values of O2(a1Δg) number density (1.5 1016 cm-3) and of the production yield (6.7 %) can be simultaneously obtained. For lower O2 partial pressure, yields higher than 10 % have been measured. In He/O2/NO mixtures, O2(a1Δg) number densities around 1016 cm-3 were achieved at atmospheric pressure for flow rates in the range 5-30 ln/mn, which could give rise to new applications.

Paper Details

Date Published: 12 May 2008
PDF: 10 pages
Proc. SPIE 7005, High-Power Laser Ablation VII, 700527 (12 May 2008); doi: 10.1117/12.781830
Show Author Affiliations
Vincent Puech, LPGP, CNRS, Univ. Paris-Sud (France)
Gerard Bauville, LPGP, CNRS, Univ. Paris-Sud (France)
Bernard Lacour, LPGP, CNRS, Univ. Paris-Sud (France)
Joao Santos Sousa, LPGP, CNRS, Univ. Paris-Sud (France)
Instituto Superior Técnico (Portugal)
Leanne C. Pitchford, LAPLACE, CNRS, Univ. Paul Sabatier (France)
Michel Touzeau, LTM, CNRS, Univ. Joseph Fourier (France)

Published in SPIE Proceedings Vol. 7005:
High-Power Laser Ablation VII
Claude R. Phipps, Editor(s)

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