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The purpose of this experiment was to record the spatial profiles of the atoms and ions originating from the cathode of a stationary glow discharge, in order to obtain information on the sputtering of the cathode, the ionisation and transport and, possibly, the electric fields. The neutrals sputtered from the magnesium cathode under bombardment by helium ions were detected by means of laser-induced fluorescence in the UV. The same procedure was also applied to the subsequent Mg-ions. The relevant resonance lines could thus be excited with a frequency-doubled dye laser. Due to their high oscillator strength (f = 1.9 for the atoms and 0.6 for the ions), a detection limit of a few 1.0 E4/cm3 was within reach, which meant that a nearly normal discharge could be investigated, in spite of the fairly low current densities involved.

Additional information

Authors: MERTENS P, Institut für Plasmaphysik, Kernforschungsanlage Jülich GmbH, Jülich (DE);NING C, Institut für Plasmaphysik, Kernforschungsanlage Jülich GmbH, Jülich (DE)
Bibliographic Reference: Article: Proceedings of the 20th International Conference on Phenomena in Ionized Gases, Contributed Papers 6 (1991) pp. 1443-1444
Record Number: 199210264 / Last updated on: 1994-12-02
Original language: en
Available languages: en