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Source Parameters and Excitation in a Spark Discharge

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Abstract:

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.

Keywords: Emission spectroscopy; Spark; Time-resolved spectroscopy

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370272774352605

Affiliations: Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706

Publication date: January 1, 1972

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