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Experiments are reported for two key lines of aluminum, sparked in nitrogen against graphite for a variety of discharge current waveforms, that suggest that changes in spark source parameters do not fundamentally change the excitation processes in the spark. A straightforward, "either-or"
excitation condition is imposed on a simple mass transport model, calculated from measured velocities of electrode vapor in the spark, to predict the time dependence of a primary feature of radiation emitted in the Al II spectrum. The data combine to suggest that parameter-dependent excitation
indices require re-examination in terms of the manner in which radiation emitted from the discharge is viewed by the spectrometer.
Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706
Publication date: January 1, 1972
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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)