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Issue Eur. Phys. J. Appl. Phys.
Volume 47, Number 2, August 2009
11th International Symposium on High Pressure, Low Temperature Plasma Chemistry (HAKONE XI)
Article Number 22807
Number of page(s) 7
Section 11th International Symposium on High Pressure, Low Temperature Plasma Chemistry (HAKONE XI)
DOI 10.1051/epjap/2009103
Published online 05 June 2009

Eur. Phys. J. Appl. Phys. 47, 22807 (2009)
DOI: 10.1051/epjap/2009103

Atmospheric pressure generation of O2(a1$\Delta_g$) by microplasmas

J.S. Sousa1, 2, G. Bauville1, B. Lacour1, V. Puech1 and M. Touzeau3

1  Laboratoire de Physique des Gaz et des Plasmas, UMR 8578 CNRS/Université Paris-Sud, Bât. 210, 91405 Orsay, France
2  Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Avenida Rovisco Pais, 1049-001 Lisboa, Portugal
3  Laboratoire des Techniques de la Microélectronique, UMR 5129 CNRS/Université Joseph Fourier/INPG, 17 av. des Martyrs, 38054 Grenoble, France

joao.santos-sousa@u-psud.fr

Received: 9 January 2009 / Accepted: 6 April 2009 / Published online: 5 June 2009

Abstract
The generation of singlet delta oxygen states (O2(a1$\Delta_g$)) by microplasmas has been studied experimentally. In the present paper, it is shown that micro-cathode sustained discharges (MCSD's) can be used to produce high fluxes of O2(a1$\Delta_g$) at atmospheric pressure. In He/O2/NO mixtures, O2(a1$\Delta_g$) number densities higher than 1016 cm-3 can be generated by this 3-electrode configuration and transported over distances of some tens of cm. In fact, at total flow rates up to 30 ln/min, O2(a1$\Delta_g$) fluxes above 10 mmol/h were measured in the MCSD afterglow, at 26 cm downstream. As a result, MCSD's appear to be very efficient and suitable tools for the continuous production of large amounts of O2(a1$\Delta_g$) at atmospheric pressure, which could give rise to a wide range of new applications, namely biological. The effect of different parameters such as gas flows and mixtures, and discharge current are discussed in the paper.

PACS
52.50.Dg - Plasma sources.
52.70.Kz - Optical (ultraviolet, visible, infrared) measurements.
52.80.Tn - Other gas discharges.

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