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Title: Particle-In-Cell simulation of laser photodetachment in capacitively coupled radio frequency oxygen discharges

Particle-In-Cell simulations with Monte Carlo collision of capacitively coupled radio frequency oxygen discharges are used to study the appearance and characteristics of two experimentally observed electronegative modes, the high electronegative mode for low peak-to-peak voltage, and the low electronegative mode for high peak-to-peak voltage. For the high electronegative mode, the simulated laser photodetachment signal agrees very well with the experiment. The simulation identifies the dominant transport processes for high electronegativities: electrons flow fast out of the perturbed region, where the laser pulse generates laser detachment of negative ions. Negative ions are not streaming inward, but are produced within this region by dissociative attachment after the laser pulse.
Authors:
; ;  [1] ; ; ;  [2]
  1. Computing Center, University of Greifswald, Felix-Hausdorff-Str. 12, 17489 Greifswald (Germany)
  2. Institute of Physics, University of Greifswald, Felix-Hausdorff-Str. 6, 17489 Greifswald (Germany)
Publication Date:
OSTI Identifier:
22218462
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 20; Journal Issue: 11; 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; 74 ATOMIC AND MOLECULAR PHYSICS; ANIONS; ELECTRIC POTENTIAL; ELECTRON COLLISIONS; ELECTRON DETACHMENT; ELECTRONEGATIVITY; ELECTRONS; HIGH-FREQUENCY DISCHARGES; LASERS; MONTE CARLO METHOD; OXYGEN; PLASMA DIAGNOSTICS; PLASMA PRODUCTION; PLASMA SIMULATION; RADIOWAVE RADIATION