Light source inner surface changes depending on treatment

Abstract

Our work is connected with the preparation of different type of electrodeless discharge lamps. In this work we investigate the influence of the SiO2 glass wall treatment procedures on the inner surface of the electrodeless lamps. Three different treatment procedures were applied: vacuum cleaning, vacuum‐thermal cleaning and training in the high frequency discharge. The surface modification has been investigated by means of atomic force microscopy. Substantial changes of the SiO2 glass surface have been observed. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Study of Inductive Coupled Hydrogen and Argon Plasma Interaction with SiO2 Glass

“…The SiO 2 surface topography by the treatment with pure argon plasma (Figure 4(a)) is uniform, with comparably small peak height and average deviation similar as observed before in our work 5. At the presence of hydrogen and OH groups in plasma (Figure 4(b–d)) the surface modifications are significant, that is demonstrated by the surface parameters, listed in the Table 1.…”

“…Figure 4(a) the inner surface of the spherical argon electrodeless lamp is shown, while Figure 4(b-d) represents the examples of inner surfaces of dumbbell argonhydrogen electrodeless lamp. The surface was studied in the three different parts (1-3) of this lamp as shown in Figure 1(c).The surface parameters for the lamps with ArþH 2 mixture and pure Ar fillings are given in the Table1.The SiO 2 surface topography by the treatment with pure argon plasma (Figure4(a)) is uniform, with comparably small peak height and average deviation similar as observed before in our work [5]. At the presence of hydrogen and OH groups in plasma (Figure4(b-d)) the surface modifications are significant, that is demonstrated by the surface parameters, listed in the Table1.…”

“…The force constant of each cantilever was measured by calibrated cantilevers and found to be 0.1 and 0.16 N/m for cantilevers of two different dimensions. In the previous work by investigation of the inner surfaces of the light sources, we found that high frequency discharge makes substantial changes on the SiO 2 glass surface 5…”

“…In the previous work by investigation of the inner surfaces of the light sources, we found that high frequency discharge makes substantial changes on the SiO 2 glass surface. [5] In this work we compare changes on the inner surface of lamps filled with pure argon and with argon-hydrogen mixture. In Figure 4 the images of inner surface of different HFELS are shown.…”

Plasma Temperature Determination of Hydrogen Containing High-Frequency Electrodeless Lamps by Intensity Distribution Measurements of Hydrogen Molecular Band

“…The high-frequency electrodeless lamps (HFEDLs) are well known as a bright radiators of narrow and intense spectral lines in wide spectral range from vacuum ultra violet to infrared. These lamps are widely used in Atomic Absorption Spectroscopy for the determination of metal concentrations [1,2], and they are of interest in plasma-surface interaction investigations due to lack of electrodes [3,4]. For the application of HFEDLs and for the discharge plasma modeling it is important to estimate the plasma parameters in the lamps.…”