Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 50, Issue 21, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6463/aa6c44
Keywords
surface discharge; two photon absorption laser-induced fluorescence; atomic oxygen; atmospheric pressure discharge
Categories
Funding
- National Science Foundation of China [51307134, 51221005]
- China Scholarship Council (CSC)
- Batten Endowed Chair, Old Dominion University, USA
- 'Pole d'Attraction Interuniversitaire' project (PAI) [P7/34]
- 'REFORGAS GreenWin' project [7267]
- M Era-Net
- project 'PlasmaTex'
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The generation of atomic oxygen in an array of surface micro-discharge, working in atmospheric pressure He/O-2 or Ar/O-2 mixtures, is investigated. The absolute atomic oxygen density and its temporal and spatial dynamics are studied by means of two-photon absorption laser-induced fluorescence. A high density of atomic oxygen is detected in the He/O-2 mixture with up to 10% O-2 content in the feed gas, whereas the atomic oxygen concentration in the Ar/O-2 mixture stays below the detection limit of 10(13) cm(-3). The measured O density near the electrode under the optimal conditions in He/1.75% O-2 gas is 4.26 x 10(15) cm(-3). The existence of the ground state O (2p(4) P-3) species has been proven in the discharge at a distance up to 12 mm away from the electrodes. Dissociative reactions of the singlet O-2 with O-3 and deep vacuum ultraviolet radiation, including the radiation of excimer He*(2), are proposed to be responsible for O (2p(4) P-3) production in the far afterglow. A capability of the surface micro-discharge array delivering atomic oxygen to long distances over a large area is considered very interesting for various biomedical applications.
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