Plasma Temperature and Surface Studies of Argon-Hydrogen Containing Low-Temperature Dumbbell form Light Sources

Abstract

In the current study we present the plasma temperature and surface topography measurement results for dumbbell-form lamps before and after the additional training at 2.4 GHz frequency. The plasma temperature was determined from the OH emission in all three parts of the lamp (spherical, capillary and cylindrical), exciting the discharge at 100 MHz field frequency. The SiO 2 glass surface topography measurements were performed with Atomic Force Microscope. The surface is much smoother when gigahertz field had been used, however no significant differences between plasma temperatures before and after the training at 2.4 GHz could be observed. It was observed that in the capillary part of the lamp the plasma temperature is lowest and the inner surface is roughest, contrary to the other parts of the lamp, where temperature is much higher and the surface smoother, showing that the plasma temperature affects surface topography as well.