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Inreased Power Concentration and its Effect on the Discharge Parameters on the Low Pressure Hg‐Rare Gas Positive Column III. Effects of an Axial Rod
Author(s) -
Kreher J.,
Stern W.
Publication year - 1989
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.2150290608
Subject(s) - radius , materials science , atomic physics , plasma , radiation , tube (container) , glass tube , radiant energy , gas filled tube , electron temperature , flux (metallurgy) , plasma parameters , electron density , optics , chemistry , physics , composite material , nuclear physics , computer security , computer science , metallurgy
After the investigation of the influence of current and tube radius on the power concentration of the Hg‐rare gas discharge in the two previous parts, part III deals with the corresponding effects of additional recombination surfaces. The plasma parameters (radiant flux of the resonance lines, field strength, electron density, electron energy distribution function) are measured in a discharge tube with an axial glass rod. With increasing rod diameter and increasing distance from the tube axis radial radiation intensity distribution becomes asymmetric. The field strength increases with the radius of the rod. The dependence of the field strength and that of the radiant flux on the parameters of the discharge do not basically change. The measured UV‐radiation efficiency of the positive column is higher than that of discharges without axial rod for equal tube radius. This is attributed primarily to the changed radial electron density distribution and its effect on the collision processes.