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Title: Electron density and temperature measurement by continuum radiation emitted from weakly ionized atmospheric pressure plasmas

The electron-atom neutral bremsstrahlung continuum radiation emitted from weakly ionized plasmas is investigated for electron density and temperature diagnostics. The continuum spectrum in 450–1000 nm emitted from the argon atmospheric pressure plasma is found to be in excellent agreement with the neutral bremsstrahlung formula with the electron-atom momentum transfer cross-section given by Popović. In 280–450 nm, however, a large discrepancy between the measured and the neutral bremsstrahlung emissivities is observed. We find that without accounting for the radiative H{sub 2} dissociation continuum, the temperature, and density measurements would be largely wrong, so that it should be taken into account for accurate measurement.
Authors:
;  [1] ;  [2] ;  [3]
  1. Department of Physics, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701 (Korea, Republic of)
  2. High-enthalpy Plasma Research Center, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju 561-756 (Korea, Republic of)
  3. 5771 La Jolla Corona Drive, La Jolla, CA 92037 (United States)
Publication Date:
OSTI Identifier:
22293089
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 8; Other Information: (c) 2014 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; ARGON; ATMOSPHERIC PRESSURE; BREMSSTRAHLUNG; CROSS SECTIONS; DISSOCIATION; ELECTRON DENSITY; ELECTRON-ATOM COLLISIONS; EMISSION SPECTRA; EMISSIVITY; HYDROGEN; MOMENTUM TRANSFER; PLASMA; TEMPERATURE MEASUREMENT