Optical computerized tomography of the E-H transition in inductively coupled plasmas in Ar and Ar-CF4 mixtures

Y. Miyoshi, Zoran Lj Petrović, Toshiaki Makabe

Research output: Contribution to journalArticlepeer-review

48 Citations (Scopus)

Abstract

We have applied optical emission spectroscopy together with computerized tomography (CT) to study the transition between E and H modes in inductively coupled plasma. Measurements were performed in pure Ar and in CF4(5%)/Ar mixture in the pressure range between 5 and 300 m Torr. It was found that the radial and azimuthal CT images of the E (capacitively coupled) mode are quite different from those of the H (inductively coupled) mode. The E mode structures show clearly the presence of capacitive coupling, while the structure of the H mode corresponds to that of the predicted induced fields. The differences diminish at low pressures due to the non-local transport of electrons. The contributions of direct and stepwise excitation are separated by using two different energy levels, 2p1 and 2p9, of Ar. In addition, the measurements obtained in electronegative gas mixture with large losses of electrons of moderate and small energy show more clearly the kinetics of excitation in the two modes and the regions where high-energy electrons are produced.

Original languageEnglish
Pages (from-to)454-461
Number of pages8
JournalJournal of Physics D: Applied Physics
Volume35
Issue number5
DOIs
Publication statusPublished - 2002 Mar 7

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

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