The absorbed HF power per electron in an open air helium microwave-induced-plasma flame produced by an axial injection torch
- Univ. of Cordoba (Spain); and others
Electromagnetic devices permitting the production of microwave plasmas (M.I.P.), especially those working at atmospheric pressure, have deserved a lot of attention by scientists from their utilization as a source of excitation in atomic emission spectroscopy (A.E.S.). Among them, those so-called {open_quotes}torches{close_quotes} have been intensely studied and new designs of such devices are being continuously proposed. The interest of the microwave plasma structures lies in their ability to operate at low HF power and atmospheric pressure, as well as to support plasmas of various gases. Among them, helium seems to be of particular importance for the excitation of analytes because of its high ionization potential (24.6 eV) and, as a consequence, a high metastable energy, which determines its capability of exciting non-metals (e.g., halogens). In addition, helium offers a simpler overall background spectrum. The axial injection torch ({open_quotes}torche a injection axiale{close_quotes} or T.I.A.) designed by Moisan et al. avoids some of the problems presented by previous torches, especially the problem associated with the alteration of the discharge quartz tube normally used as a plasma container because the {open_quotes}plasma flame{close_quotes} is produced in {open_quotes}open{close_quotes} air at the tip of a metallic nozzle throughout the discharge gas flows. At the same time, T.I.A. provides a stable discharge using high HF power levels (300-900 W) and relatively low gas flow (3-13 L/min) without the necessity of additional cooling.
- OSTI ID:
- 213009
- Report Number(s):
- CONF-950749-; TRN: 96:010158
- Resource Relation:
- Conference: 22. international conference on phenomena in ionized gases, Hoboken, NJ (United States), 31 Jul - 4 Aug 1995; Other Information: PBD: 1995; Related Information: Is Part Of XXII International conference on phenomena in ionized gases. Contributed papers 4; Becker, K.H.; Carr, W.E.; Kunhardt, E.E. [eds.]; PB: 256 p.
- Country of Publication:
- United States
- Language:
- English
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