Determination of the Electron Temperature of Atmospheric Pressure Argon Plasmas by Absolute Line Intensities and a Collisional Radiative Model

2014 ◽  
Vol 11 (8) ◽  
pp. 777-786 ◽  
Author(s):  
Leila Taghizadeh ◽  
Anton Nikiforov ◽  
Rino Morent ◽  
Joost van der Mullen ◽  
Christophe Leys
Keyword(s):  
Electron Temperature ◽  
Atmospheric Pressure ◽  
Line Intensities ◽  
Argon Plasmas ◽  
Collisional Radiative Model ◽  
Radiative Model

scholarly journals An Investigation of Non-Equilibrium Effects in Thermal Argon Plasmas

1985 ◽  
Vol 40 (8) ◽  
pp. 810-825 ◽  
Author(s):  
C. J. Timmermans ◽  
R. J. Rosado ◽  
D. C. Schram
Keyword(s):  
Atmospheric Pressure ◽  
Ground Level ◽  
Local Thermal Equilibrium ◽  
Particle Diffusion ◽  
Excitation Rate ◽  
Direct Ionization ◽  
Argon Plasmas ◽  
Collisional Radiative Model ◽  
Radiative Model ◽  
Neutral Ground

The parameters and transport properties of a wall stabilized argon arc (40-200 A) at atmospheric pressure with diameters of 5 and 8 mm are studied by spectroscopy and interferometry. The plasma is assumed to be partial local thermal equilibrium and this assumption is verified with the aid of a collisional-radiative model. The departures from Saha-equilibrium of the argon neutral ground state are found to be associated with particle diffusion and the escape of recombination radiation. The measurement of the total excitation rate, from the ground level, including direct ionization, of neutral argon is in reasonable agreement with the literature value.

Investigation of Excited States of Helium Atoms in a Stationary PIG-Discharge

1971 ◽  
Vol 26 (2) ◽  
pp. 186-197 ◽  
Author(s):  
H. W. Drawin ◽  
F. Klan ◽  
H. Ringler
Keyword(s):  
Excited States ◽  
Theoretical Calculations ◽  
Principal Quantum Number ◽  
Population Densities ◽  
Boltzmann Plot ◽  
Line Intensities ◽  
Quantum Numbers ◽  
Collisional Radiative Model ◽  
Radiative Model ◽  
Large Experimental Error

AbstractSpectral line intensities emitted by a quiescent PIG-discharge have been measured and the population densities up to a principal quantum number n = 24 have been derived from them. The experimentally determined population densities have been compared with theoretical ones calculated on the basis of a collisional-radiative model in which one accounts for electron and atom collisions. I t is shown that even in the case of different electron and atom temperatures, Te and Ta, an evaluation of the Boltzmann plot at medium and moderately high quantum numbers always leads to the electron temperature, whereas the Saha-Eggert equation for the same states may yield incorrect electron densities. The theoretical calculations predict an inflection of the slope of the Boltzmann plot from Te to Ta for very highly excited states. For the plasma para­ meters under which the PIG-discharge was operated (ne ≅ 2.5 × 1012 cm-3, Te ≅ 1200°K, n0 ≅ 1.5 × 1015 cm-3, 300°K) the change of the slope should become visible for states having principal quantum numbers n > 18. Due to the large experimental error bars it was not possible to check this behaviour.

Temporal and Spatial Behavior of Electron Density and Temperature in a Laser-Produced Plasma from YBa2Cu3O7

1998 ◽  
Vol 52 (3) ◽  
pp. 449-455 ◽  
Author(s):  
S. S. Harilal ◽  
C. V. Bindhu ◽  
V. P. N. Nampoori ◽  
C. P. G. Vallabhan
Keyword(s):  
Electron Temperature ◽  
Electron Density ◽  
Spectroscopic Studies ◽  
Spatial Behavior ◽  
Laser Irradiance ◽  
Stark Broadening ◽  
Line Intensities ◽  
Experimental Parameters ◽  
Temporal And Spatial

Spectroscopic studies of laser-induced plasma from a high-temperature superconducting material, viz., YBa2Cu3O7 (YBCO), have been carried out. Electron temperature and electron density measurements were made from spectral data. The Stark broadening of emission lines was used to determine the electron density, and the ratio of line intensities was exploited for the determination of electron temperature. An initial electron temperature of 2.35 eV and electron density of 2.5 × 1017 cm−3 were observed. The dependence on electron temperature and density on different experimental parameters such as distance from the target, delay time after the initiation of the plasma, and laser irradiance is also discussed in detail.

scholarly journals The Cu I And Zn I-Like Spectra of Pr, Eu, Gd, Dy And Yb Emitted by a Tokamak Plasma in the 50–200 Å Range

1988 ◽  
Vol 102 ◽  
pp. 75-77
Author(s):  
W.L. Hodge ◽  
M. Finkenthal ◽  
H.W. Moos ◽  
S. Lippmann ◽  
L.K. Huang ◽  
...  
Keyword(s):  
Rare Earth ◽  
High Temperature ◽  
Grazing Incidence ◽  
Spectral Lines ◽  
Tokamak Plasma ◽  
Low Density ◽  
Line Intensities ◽  
Time Histories ◽  
Collisional Radiative Model ◽  
Radiative Model

AbstractSpectra of rare earth elements, praseodymium, europium, gadolinium, dysprosium and ytterbium (Z=59 to Z=70) have been recorded from a high temperature (Te=1–1.4 keV) - low density (ne=1013cm−3) tokamak plasma, in the 50–200 Å range. The absolute brightnesses of the lines originating in 4–4 transitions of Cu I and Zn I-like ions of the above mentioned elements have been measured by means of a photometrically calibrated grazing incidence spectrometer. Newly identified Cu I-like, 4s2S1/2-4p2P1/2transitions in Pr30+, Eu34+, Gd35+, Dy37+and Yb41, and intercombination transitions 4s21S0-4s4p3P1, in the Zn I-like ions of the mentioned elements are presented. The identifications are based on interpolation of previous experimental results, ab initio energy level computations using the RELAC code and are substantiated by the time histories of individual spectral lines. The experimental line intensities of the Cu I and Zn I-like ions are compared with those predicted by a collisional-radiative model under the conditions of the tokamak plasma.

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