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  • Density distributions of magnesium atoms and ions in a helium glow discharge with a magnesium cathode : An experiment with laser-induced fluorescence


In this work, a low current DC-glow discharge in helium with a plane magnesium cathode, which is in a parallel configuration with the anode, has been investigated. The density distributions of sputtered magnesium atoms and ions in the discharge, especially in the cathode fall region and in the negative glow, have been measured by means of laser-induced fluorescence with high spatial resolution and sensitivity. The density profiles of the atoms show a maximum near the cathode, the position of which depends on the values of pressure and current. The profiles of the ions on the axis show a maximum in the negative glow region, which also depends on the pressure and on the current. The degree of ionisation of the magnesium atoms in this region reaches values of more than 50%, leading to the conclusion that Penning ionisation is the dominant process for the ionisation of magnesium atoms.

Additional information

Authors: CHANGLONG N, Institut für Plasmaphysik, Kernforschungsanlage Jülich GmbH, Jülich (DE)
Bibliographic Reference: Report: Jül-2484 DE (1991) 92 pp.
Availability: Available from Zentralbibliothek der Kernforschungsanlage Jülich GmbH, Postfach 1913, 5170 Jülich (DE)
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