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Measurement of the electron density in atmospheric-pressure low-temperature argon discharges by line-ratio method of optical emission spectroscopy

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X M Zhu1, Y K Pu1, N Balcon2,3 and R Boswell2

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A new collisional–radiative model for atmospheric-pressure low-temperature argon discharges is proposed, which illustrates the significant effect of electron density on the excited atom population distribution. This makes it possible to determine the electron density from the intensity ratio of emission lines of excited atoms. Results of this new method in several types of atmospheric-pressure discharges are found to be in agreement with those of the Stark broadening method and the electric model over a wide electron density range 1011–1016 cm−3.


PACS

52.80.-s Electric discharges

52.25.Os Emission, absorption, and scattering of electromagnetic radiation

52.70.Kz Optical (ultraviolet, visible, infrared) measurements

Subjects

Instrumentation and measurement

Plasma physics

Dates

Issue 14 (21 July 2009)

Received 20 May 2009, in final form 9 June 2009

Published 26 June 2009



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