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

Journal Article · Mon Jul 15 00:00:00 EDT 2013 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4813817· OSTI ID:22122828

Niemi, K.; O'Connell, D.; Gans, T. ^[1]; Oliveira, N. de; Joyeux, D.; Nahon, L. ^[2]; Booth, J. P. ^[3]

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1. York Plasma Institute, Department of Physics, University of York, York YO10 5DD (United Kingdom)
2. Synchrotron Soleil, l'Orme des Merisiers, St. Aubin BP 48, 91192 Gif sur Yvette Cedex (France)
3. Laboratoire de Physique des Plasmas-CNRS, Ecole Polytechnique, 91128 Palaiseau (France)

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 N{sub 2}/O{sub 2} (4:1) admixtures. A maximum in the O-atom concentration of (9.1 {+-} 0.7) Multiplication-Sign 10{sup 20} m{sup -3} was found at admixtures of 0.35 vol. %, while the N-atom concentration exhibits a maximum of (5.7 {+-} 0.4) Multiplication-Sign 10{sup 19} m{sup -3} at 0.1 vol. %.

• OSTI ID: 22122828
• Journal Information: Applied Physics Letters, Vol. 103, Issue 3; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ABSORPTION
ABSORPTION SPECTROSCOPY
ATMOSPHERIC PRESSURE
ATOMS
COLD PLASMA
CONCENTRATION RATIO
DENSITY
FAR ULTRAVIOLET RADIATION
FOURIER TRANSFORM SPECTROMETERS
FOURIER TRANSFORMATION
HELIUM
NITROGEN
NON-EQUILIBRIUM PLASMA
OXYGEN
PLASMA DENSITY
PLASMA DIAGNOSTICS
RADIOWAVE RADIATION
RESOLUTION
ULTRAVIOLET SPECTRA