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Development of a Microwave-Induced Nitrogen Discharge at Atmospheric Pressure (MINDAP)

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A microwave-induced plasma has been sustained with the use of nitrogen as the nebulizer and plasma supporting gas. A concentric tube torch was constructed so the plasma could be easily ignited and maintained. This new plasma emission source has a flame-like appearance and extends 10 cm beyond the cavity, at an applied power of 250 W. The nitrogen plasma readily accepts aerosol samples and is compatible with sample introduced from a conventional nebulizer system. The radial (side-on) optical viewing configuration was found to have lower background emission than the more commonly employed axial (end-on) configuration. Optimum operating conditions were established from the effects of applied power, flow rate, and signal-to-background noise on the intensity of both atom and ion transitions. A discussion of the background spectral features and the analytical potential of this new source is presented.

Keywords: Elemental analysis; Emission spectroscopy; Microwave plasma

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702854248935

Affiliations: 1: Department of Chemistry, Indiana University, Bloomington, Indiana 47405; present address: Laboratory of Chemical Physics, National Institutes of Health, Bethesda, MD 20205 2: Department of Chemistry, Indiana University, Bloomington, Indiana 47405

Publication date: March 1, 1985

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