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Abstract

Laser-induced fluorescence was applied at the B-X transition of the CH radical to measure absolute densities of the CH radicals in an electron cyclotron resonance methane plasma. The absolute experimental uncertainty is only about 30 % due to a new calibration procedure. The CH density correlates well with optical emission from the CH A-X and B-X transitions over a wide pressure range. Experimental results are in satisfactory agreement with predictions from a model based on rate equations for the electron-induced dissociation and ionisation of the parent methane gas. This model also includes the interaction of the plasma species with the surrounding walls and the particle transport due to pumping.

Additional information

Authors: JACOB W, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);ENGELHARD M, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);MÖLLER W, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);KOCH A, Universität des Saarlandes, Lehrstuhl für Messtechnik, Saarbrücken (DE);MOLLER W, Max-Planck-Institut fur Plasmaphysik, Garching bei Munchen (DE)
Bibliographic Reference: Article: Applied Physics Letters, Vol. 64 (1994) No. 8, pp. 971-973
Record Number: 199410369 / Last updated on: 1994-11-28
Category: PUBLICATION
Original language: en
Available languages: en