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Spatially resolved measurements of plasma-emission sources can greatly aid in their application to atomic-emission spectrometry. In this study, detailed two-dimensional emission profiles of a plasma sustained by electromagnetic surface waves from a surfatron have been measured with
an imaging spectrometer. In helium, and under the operating conditions described, the plasma is found to possess a "doughnut" shape much like the inductively coupled plasma (ICP) in argon. Emission from the following types of spectral features was found to be confined to the plasma annulus:
(1) He(I) lines; (2) molecular bands; (3) background continuum; (4) difficult-to-excite transitions from nonmetallic analytes. In contrast, two-dimensional profiles for metallic analytes (introduced in the form of an aerosol from a glass-frit nebulizer) show localized maxima along the central
axis of the plasma. Spatially resolved measurements have suggested ways in which the surfatron can be employed to advantage for atomic emission spectrometry. Possible excitation mechanisms to account for the spatial properties of the surfatron are also offered.
Department of Chemistry, Indiana University, Bloomington, Indiana 47405-4001
Publication date: July 1, 1987
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The Society publishes the internationally recognized, peer reviewed journal, Applied Spectroscopy, which is available both in print and online. Subscriptions are included with membership or can be purchased by institutional or corporate organizations. Abstracts may be viewed free of charge. Previously published as Bulletin (Society for Applied Spectroscopy)