Spectroscopic measurement of the electron temperature and the metastable densities by using a simple collisional-radiative model in a low-pressure inductively-coupled argon plasma

Young Kwang Lee, Kwang Tae Hwang, Min Hyong Lee, Chin Wook Chung

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

The electron temperature (Te) and the metastable densities (n1s3, n1s5) in inductively-coupled plasma (ICP) reactor in argon are investigated by using a spectroscopic method at various powers (100-1000 W) and pressures (2-50 mTorr). This spectroscopic method is based on the simple collisonal-radiative model caused by using the relative emission intensities of the special lines that originate from 4p levels. Moreover, this method requires a rate coefficient whose calculation relies on the accuracy of the electron excitation cross section. The electron temperatures obtained by using optical emission spectroscopy (OES) are compared with those obtained by using a Langmuir probe to establish their practical validity. Results show a close agreement in the pressure range of 10 - 20 mTorr. At the same time, the metastable densities are estimated and presented. The metastable densities (of the order of 1010 - 1011 cm-3) increase with growing electron temperature.

Original languageEnglish
Pages (from-to)1792-1799
Number of pages8
JournalJournal of the Korean Physical Society
Volume52
Issue number6
DOIs
StatePublished - 2008 Jun

Keywords

  • Electron temperature
  • ICP
  • Metastable density
  • OES

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