Experimental investigation and characterization of the departure from local thermodynamic equilibrium along a surface‐wave‐sustained discharge at atmospheric pressure

A surface-wave-sustained discharge created by using a surfatron device in a tube open to the atmosphere can be used to maintain a microwave (2.45 GHz) plasma at atmospheric pressure at powers of less than 300 W. The TIA ( Torche à Injection Axiale) is a device also producing a plasma that, moreover, permits us to work at high power (higher than 200 W and up to 1000 W). A study of the departure from the thermodynamic equilibrium existing in the argon plasmas created by both devices has been done by using optical emission spectroscopy techniques in order to characterize them and to evaluate their possible advantages when they are used for applied purposes.

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Electron Density and Gas Temperature from Line Broadening in an Argon Surface-Wave-Sustained Discharge at Atmospheric Pressure

Applied Spectroscopy ◽

10.1366/0003702041959415 ◽

2004 ◽

Vol 58 (9) ◽

pp. 1032-1037 ◽

Cited By ~ 50

Author(s):

M. Christova ◽

E. Castaños-Martinez ◽

M. D. Calzada ◽

Y. Kabouzi ◽

J. M. Luque ◽

...

Keyword(s):

Surface Wave ◽

Electron Density ◽

Atmospheric Pressure ◽

Gas Temperature ◽

Line Broadening ◽

Sustained Discharge

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Effect of frequency on local thermodynamic equilibrium conditions in an inductively coupled argon plasma at atmospheric pressure

Journal of Applied Physics ◽

10.1063/1.346489 ◽

1990 ◽

Vol 68 (6) ◽

pp. 2643-2648 ◽

Cited By ~ 59

Author(s):

Javad Mostaghimi ◽

Maher I. Boulos

Keyword(s):

Thermodynamic Equilibrium ◽

Atmospheric Pressure ◽

Local Thermodynamic Equilibrium ◽

Argon Plasma ◽

Equilibrium Conditions ◽

Inductively Coupled

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Influence of gas flow on the axial distribution of densities, temperatures and thermodynamic equilibrium degree in surface-wave plasmas sustained at atmospheric pressure

Spectrochimica Acta Part B Atomic Spectroscopy ◽

10.1016/j.sab.2019.105636 ◽

2019 ◽

Vol 158 ◽

pp. 105636

Author(s):

Juana Martínez-Aguilar ◽

Cristina González-Gago ◽

Eduardo Castaños-Martínez ◽

José Muñoz ◽

María Dolores Calzada ◽

...

Keyword(s):

Surface Wave ◽

Thermodynamic Equilibrium ◽

Atmospheric Pressure ◽

Gas Flow ◽

Axial Distribution ◽

Equilibrium Degree

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LTE Conditions within the Central Channel of the Plasma

Applied Spectroscopy ◽

10.1366/0003702894204498 ◽

1989 ◽

Vol 43 (8) ◽

pp. 1385-1387 ◽

Cited By ~ 5

Author(s):

Thomas R. Smith ◽

M. Bonner Denton

Keyword(s):

Thermodynamic Equilibrium ◽

Atmospheric Pressure ◽

Inductively Coupled Plasma ◽

Local Thermodynamic Equilibrium ◽

Magnesium Ion ◽

Central Channel ◽

Electron Densities ◽

Inductively Coupled ◽

Excitation Conditions

Studies were performed on the effect of torch pressure on the excitation conditions within an inductively coupled plasma (ICP). Experimentally measured magnesium ion-to-atom ratios and electron densities were used to determine the deviation of the plasma from local thermodynamic equilibrium (LTE) conditions. Results of these studies indicate that the plasma is in an infrathermal state when operated at atmospheric pressure, and excitation conditions within the central channel of an ICP shift towards LTE conditions as torch pressure is increased.

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