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

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. %.
Authors:
; ;  [1] ; ; ;  [2] ;  [3]
  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)
Publication Date:
OSTI Identifier:
22122828
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 3; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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