Measurement of the Electron Radiation Temperature and Electron Density in Parallel Plate Radio Frequency Discharges
Hebner, Gregory Albert
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https://hdl.handle.net/2142/69373
Description
Title
Measurement of the Electron Radiation Temperature and Electron Density in Parallel Plate Radio Frequency Discharges
Author(s)
Hebner, Gregory Albert
Issue Date
1987
Doctoral Committee Chair(s)
Verdeyen, Joseph T.
Department of Study
Electrical Engineering
Discipline
Electrical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Electronics and Electrical
Abstract
Microwave diagnostic techniques have been used to measure the radiation temperature and electron density in parallel plate capacitively coupled radio frequency (2.5 MHz) discharges. Evidence is presented for the existence and importance of an energetic electron beam, produced by the large cathode sheath voltage, which sustains and excites the plasma. The measured radiation temperature of the bulk electrons is 500 K for helium and 800 K for argon. An upper limit on the radiation temperature is obtained for N$\sb2$ (1200 K) and CF$\sb4$ (3000 K) discharges. Measurements of the electron density in helium as a function of electrode spacing show a peak in the electron density that is consistent with the theory of ionization by beam electrons. The electric fields required to carry the RF current by drift in the bulk of the glow are low and consistent with the measured radiation temperature. The implications of these measurements on the nature of the RF plasma sustaining mechanism, the voltage distribution and the electron energy distribution are discussed.
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