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- E-ISSN 2288-8985
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- E-ISSN2288-8985
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Development and spectroscopic characteristics of the high-power wave guide He Plasma
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
2012, v.25 no.5, pp.265-272
https://doi.org/10.5806/AST.2012.25.5.265
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(2012). Development and spectroscopic characteristics of the high-power wave guide He Plasma. Analytical Science and Technology, 25(5), 265-272, https://doi.org/10.5806/AST.2012.25.5.265
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Abstract
Okamoto cavity was modified to generate high power (2.45 GHz, 2 kW) He, N2 and Ar plasmas with WR-340 waveguide. Many factors which influence to the plasma generation were optimized and investigated for the spectroscopic properties of the He plasma generated. Some of the important factors are the diameter of the inner conductor, the distance between the inner and outer conductors and the distance between the tip of the inner conductor and the torch. After optimization for the He, two torches (a commercial mini torch for ICP and a tangential flow torch made locally) were compared and showed similar results for the helium plasma gas flow of 25 L/min~30 L/min. A tall torch (extended) was used to block the air in-flow and reduced the background intensity at 340 nm region (NH band). Emission intensity was measured for determination of halogen element in the aqueous solution with power and carrier gas flow rate. Electron number density and the excitation temperature were on the order of 3.67×1011/cm3 and 4,350 K, respectively. These values are similar or a bit smaller than other microwave plasmas. It has been possible to analyze aqueous samples. The detection limit for Cl (479.45 nm) was obtained to be 116 mg/L and needs analytical optimization for the better performance.
- keywords
- High power microwave plasma, MIP, Okamoto cavity, Helium plasma, WR-340 waveguide
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