Absolute atomic oxygen and nitrogen densities in radio-frequency driven atmospheric pressure cold plasmas: Synchrotron vacuum ultra-violet high-resolution Fourier-transform absorption measurements

Kari Niemi, Deborah O'Connell, Nelson de Oliveira, Denis Joyeux, Laurent Nahon, Jean-Paul Booth, Timo Gans

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Reactive atomic species play a key role in emerging cold atmospheric pressure plasma applications, in particular, in plasma medicine. Absolute densities of atomic oxygen and atomic nitrogen were measured in a radio-frequency driven non-equilibrium plasma operated at atmospheric pressure using vacuum ultra-violet (VUV) absorption spectroscopy. The experiment was conducted on the DESIRS synchrotron beamline using a unique VUV Fourier-transform spectrometer. Measurements were carried out in plasmas operated in helium with air-like N2=O2 (4:1) admixtures. A maximum in the O-atom concentration of (9.1±0:7)10^20 m3 was found at admixtures of 0.35 vol. %, while the N-atom concentration exhibits a maximum of (5.7±0.4)10^19 m3 at 0.1 vol. %.
Original languageEnglish
Article number034102
Number of pages4
JournalApplied Physics Letters
Issue number3
Early online date15 Jul 2013
Publication statusPublished - 2013

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