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Title: OH radicals distribution in an Ar-H{sub 2}O atmospheric plasma jet

Recently, plasma jet systems found numerous applications in the field of biomedicine and treatment of temperature-sensitive materials. OH radicals are one of the main active species produced by these plasmas. Present study deals with the investigation of RF atmospheric pressure plasma jet in terms of OH radicals production by admixture of H{sub 2}O into argon used as a feed gas. Generation of OH radicals is studied by laser-induced fluorescence spectroscopy. The excitation dynamics of OH radicals induced by the laser photons is studied by time-resolved spectroscopy. It is shown that vibrational and rotational energy transfer processes, which are sensitive to the surrounding species, can lead to the complication in the OH radicals diagnostics at high pressure and have to be considered during experiments. The axial and radial 2D maps of absolute densities of hydroxyl radicals at different water contents are obtained. The highest density of 1.15 × 10{sup 20} m{sup −3} is measured in the plasma core for the case of 0.3% H{sub 2}O. In the x–y-plane, the OH density steeply decreases within a range of ±2 mm from its maximum value down to 10{sup 18} m{sup −3}. The effect of H{sub 2}O addition on the generation of OH radicalsmore » is investigated and discussed.« less
Authors:
;  [1] ;  [1] ;  [2] ;  [1] ;  [3] ;  [4] ;  [4] ;  [5] ;  [6]
  1. Department of Applied Physics, Research Unit Plasma Technology, Ghent University, Sint-Pietersnieuwstraat 41, Ghent B-9000 (Belgium)
  2. (Russian Federation)
  3. (China)
  4. Chimie des Interactions Plasma-Surface (ChIPS), CIRMAP, Universite de Mons, 20 Place du Parc, B-7000 Mons (Belgium)
  5. (Belgium)
  6. College of Electrical and Electronic Engineering, HuaZhong University of Science and Technology, WuHan, Hubei 430074 (China)
Publication Date:
OSTI Identifier:
22224199
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 20; Journal Issue: 9; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ARGON; ATMOSPHERIC PRESSURE; ELECTRON-MOLECULE COLLISIONS; FLUORESCENCE SPECTROSCOPY; HIGH-FREQUENCY DISCHARGES; HYDROXYL RADICALS; LASERS; MOLECULE-MOLECULE COLLISIONS; PLASMA DIAGNOSTICS; PLASMA JETS; TIME RESOLUTION; WATER