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Determination of the Electron Density in an Argon Laser Plasma by Spectroscopy of the Hydrogen Hα and Hβ Lines

✍ Scribed by B. Becker- de Mos; B. Kessler; W. Seelig

Publisher
John Wiley and Sons
Year
1993
Tongue
English
Weight
437 KB
Volume
33
Category
Article
ISSN
0005-8025

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✦ Synopsis

Abstract

From measurements of the H~α~ and H~β~ spectral line profiles in a plasma, a method is developed which allows to separate the contributions of Doppler and Stark broadening. This method is superior to the deconvolution of Voigt profiles, in particular, when the lines are of low intensity. The electron density in the plasma can be calculated from the Stark broadening.

An example is the low pressure (p ≈ 1 hPa) arc discharge of argon ion lasers which is characteristised by electron densities of approximately 10^14^ cm^−3^ at heavy particle temperatures of about 10^4^ K. These plasma parameters lead to a broadening of the Balmer H~α~ and H~β~ spectral lines of hydrogen, which has a low concentration within the discharge area. The spectral lines are broadened due to the electron density dependent Stark effect and the temperature responsive Doppler effect. The results are consistent with predictions of the argon ion laser modelling.

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