Abstract
IN the electrodeless ring discharge, the type of spectrum produced depends largely upon the voltage drop per mean free path. This is in general only a few volts, under ordinary operating conditions. A comprehensive survey of the entire subject has been given recently by Mierdel (Phys. Zeit. 25, pp. 241–55, 1924). As discussed in this article, spark spectra may be excited by increasing the voltage or by reducing the pressure. Both methods have been employed effectively; the former especially by L. and E. Bloch. We have used the latter method with potassium. At high vapour pressure the arc spectrum alone is observed. When the pressure is reduced, the spark lines appear. Observations on the stages in the excitation of known spectra furnish a trustworthy means for estimating the potential gradient in the electrodeless discharge.
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FOOTE, P., RUARK, A. The Electrodeless Discharge. Nature 114, 750 (1924). https://doi.org/10.1038/114750a0
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DOI: https://doi.org/10.1038/114750a0
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