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Title: Possibility of controlling the chemical pattern of He and Ar “guided streamers” by means of N{sub 2} or O{sub 2} additives

Plasma chemistry at atmospheric pressure and low temperature has met an increased interest due to the effective production of reactive species (mainly reactive nitrogen species and reactive oxygen species) which are demanded in many applications like in biomedicine. Τhe generation of such emissive reactive species is herein studied. A single parameter, i.e., the gas composition, is tuned and abundant chemical species are obtained in a quite controllable manner. The system refers to a small dielectric barrier discharge based reactor fed with He–N{sub 2}/O{sub 2} or Ar–N{sub 2}/O{sub 2} gases, which provides plasma in the form of “guided streamers.” The plasma is sustained by positive high voltage pulses, and the emissive transitions versus the gas composition is determined by UV-VIS optical emission spectroscopy. The relative intensities of emissive species are recorded in the ambient air where the streamers propagate. The evolution of dominant species as a function of the gas composition is mapped, and optimal conditions in terms of species production are clearly revealed. The results show that additives do not necessarily enhance the density of all species, implying the need for plasma chemistry optimization in respect to every application. The study is extended inside the reactor, supporting the above statements.more » Finally, the rotational and vibrational distributions of critical probe molecules are recorded, testing the dependence of the gas temperature and energy transfer, respectively, on the gas composition.« less
Authors:
 [1] ;  [2] ;  [3] ; ;  [1] ;  [4]
  1. IPREM, LCABIE, Plasmas et Applications, Université de Pau et des Pays de l'Adour, 64000 Pau (France)
  2. (Greece)
  3. High Voltage Laboratory, Electrical and Computer Engineering Department, University of Patras, 26504 Rion-Patras (Greece)
  4. Atelier de Physique Générale, Université de Pau et des Pays de l'Adour, 64000 Pau (France)
Publication Date:
OSTI Identifier:
22413199
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 9; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AIR; DIELECTRIC MATERIALS; ELECTRIC DISCHARGES; ELECTRIC POTENTIAL; EMISSION SPECTROSCOPY; ENERGY TRANSFER; MOLECULES; NITROGEN; OXYGEN; PLASMA; ROTATIONAL STATES; VIBRATIONAL STATES