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

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Abstract:

We have used the collisional broadening of neutral argon lines to determine the electron density and gas temperature of a microwave discharge at atmospheric pressure. The gas temperature can be obtained from the Van der Waals broadening, provided that the Stark broadening is negligible. This can be achieved by using lines from low-lying levels (close to the ground state). On the other hand, lines corresponding to transitions from high-lying levels, which are more sensitive to Stark (quadratic) broadening, can be utilized to determine electron density. The electron density values obtained from the quadratic Stark broadening of argon atoms are in reasonable agreement with those derived from the linear Stark broadening of the Hβ line. The proposed method ensures perturbation-free access to plasma parameters, which is not the case when adding hydrogen to the discharge, even in a small amount, to observe the Balmer series lines.

Keywords: ATMOSPHERIC PRESSURE; DIAGNOSIS; ELECTRON DENSITY DIAGNOSIS; EMISSION SPECTROSCOPY; GAS TEMPERATURE; MICROWAVE DISCHARGES; STARK BROADENING; SURFACE-WAVE PLASMA; VAN DER WAALS BROADENING

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702041959415

Affiliations: 1: Institute of Applied Physics, Technical University of Sofia, BG-1797 Sofia, Bulgaria 2: Groupe de Physique des Plasmas, Université de Montréal, Montréal H3C 3J7, Québec 3: Grupo de Espectroscopía de Plasmas, Edificio Einstein (C-2), Campus de Rabanales, Universidad de Córdoba, 14071 Córdoba, Spain

Publication date: September 1, 2004

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