Physical and Analytical Aspects of a Microwave Excited Plasma

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Abstract:

A microwave generator operated at about 100 W was used to maintain a narrow plasma (6 cm long × 0.3 mm diam) in flowing argon at atmospheric pressure. A tapered rectangular cavity was used to couple microwave power to the plasma discharge. Approximate temperature and electron density measurements of the plasma were made with and without water being nebulized; the temperature measurements indicated a lack of thermodynamic equilibrium. The plasma discharge was examined as a source of excitation in atomic emission spectrometry. An aerosol (produced by a system consisting of a pneumatic sprayer, a heated chamber, and a special condenser) was introduced into a plasma having an excitation and ionization temperature of about 5000 K and an electron density of about 1015 cm−3 at a position 0.3 mm from the center of the plasma. Limits of detection were measured for cadmium, gallium, indium, mercury, and zinc. Appreciable signals were also observed for calcium, lead, strontium, and boron, but no limits of detection were measured.

Keywords: Argon discharge; Atomic emission spectrometry; Microwave cavity

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370271779949258

Affiliations: 1: Department of Chemistry, University of Florida, Gainesville, Florida 32601; present address: 226 West College Avenue, Waukesha, Wisc. 53186 2: Department of Chemistry, University of Florida, Gainesville, Florida 32601; present address: UVVVR, Pristavni 24, Praha 7, Czechoslovakia 3: Department of Chemistry, University of Florida, Gainesville, Florida 32601

Publication date: May 1, 1971

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