THE EMISSION SPECTRUM OF $P_{2}$
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Date
1956
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Ohio State University
Abstract
A discharge through helium containing a little phosphorus in a hollow cathode discharge tube has been found to emit a number of new bands between 3400 and 9000 \AA. These bands have been photographed with a 35 ft. grating spectrograph and their rotational and vibrational structures studied. Analysis of the 3900-4400 \AA bands show that they arise from a $^{2}\Sigma^{+}_{u}-^{2}\Sigma^{+}_{g}$ transition of the $P^{+}_{2}$ molecule. Two lower state progressions have been analyzed but the vibrational numbering is as yet unknown. A second band system has been found in the region 3400-3850 \AA and, on the basis of an incomplete analysis, has been assigned to a $^{2}\Pi-^{2}\Pi$ transition of $P^{+}_{2}$. When a small amount of hydrogen was added to the gas in the discharge, three hydride bands were found at 3648 \AA, 3850 \AA, and 4227 \AA. From a preliminary study of the bands, it appears probable that these bands arise from a $^{2}A-^{2}\Pi$ transition of $PH^{+}$.
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Author Institution: Division of Pure Physics, National Research Council