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Emission Characteristics of Vacuum Spark Discharges. II. Aluminum Spectra in the Extreme Ultraviolet

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Abstract

A study of spectra of several-times-ionized atoms in a vacuum spark has been extended into the far ultraviolet. Thirty-two lines from the fourth, fifth, sixth, and seventh spectra of aluminum have been photographed either in first or second order in the region from 230 to 330A. The spark was operated at voltages between 5 and 20 kv with the aid of a gas trigger, and by varying the self-inductance between about 2 and 40 μh, peak currents ranging from 15 to 62 kiloamperes were obtained. Eastman SWR plates, calibrated by a time-varied method, were used for quantitative measurement of exposure values of the spectral lines. The data indicate that the relative excitation of the spectra of different stages of ionization is nearly a linear function of the current. However, a marked enhancement at 10 kv, 30 ka, and minimum inductance shows that the excitation process must depend also on other parameters.

An apparent splitting of some of the Al iv lines at the higher currents has been attributed to self-reversal.

© 1954 Optical Society of America

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