Determination of metastable level densities in a low-pressure inductively coupled argon plasma by the line-ratio method of optical emission spectroscopy
- Authors
- Lee, Young-Kwang; Moon, Se-Youn; Oh, Se-Jin; Chung, Chin-Wook
- Issue Date
- Jul-2011
- Publisher
- IOP PUBLISHING LTD
- Citation
- JOURNAL OF PHYSICS D-APPLIED PHYSICS, v.44, no.28, pp.1 - 8
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF PHYSICS D-APPLIED PHYSICS
- Volume
- 44
- Number
- 28
- Start Page
- 1
- End Page
- 8
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/168096
- DOI
- 10.1088/0022-3727/44/28/285203
- ISSN
- 0022-3727
- Abstract
- The line-ratio method of optical emission spectroscopy (OES) is used for the diagnosis of plasma parameters. In this work, electrostatic probe-assisted OES is employed to measure metastable level densities from spectral lines and electron energy distribution functions (EEDFs) in a low-pressure inductively coupled argon plasma. Emission spectroscopy is based on plasma modelling through a simple collisional-radiative model. The line intensities of Ar(3p(5)4p -> 3p(5)4s) are modified due to the plasma reabsorption at relatively high pressures where the plasma becomes optically thick. To consider this effect, a pressure dependence factor alpha(ij) (P) is first derived from both the measured intensity and pressure-dependent cross-section for electron excitation. It is found that the obtained metastable densities range from 1.3 x 10(9) to 1.2 x 10(10) cm(-3) and their ratios are nearly constant by a factor of about 3-5 in the investigated pressure range (3-50m Torr). The effect of non-Maxwellian EEDF on the metastable densities is also discussed. The results measured by the line-ratio method are consistent with that of the OES-branching fraction method taking into account the photon escape factor to treat the radiation trapping.
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