The Principal Series of the Copper Arc Spectrum

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Abstract

THE second pair of the principal series of the arc spectrum of copper has been calculated by Randall (Astro. Jour., 34, 1, 1911) as 2025.73 and 2024.42 (Rowland scale). Kayser and Runge (Kayser, “Handbuch der Spectroscopie”, vol. 5) observed only one line at 2025.08 (I. Å.), while two lines in this region have been photographed by Rubies (An. Soc. Esp. Y Quim, 15, 432, 1917), and their wave-lengths given in Fowler's Report on Series in Line Spectra as 2025.1 and 2024.11 (presumably on the Rowland scale). Shenstone (Phil. Mag., 49, 951, 1925) in his low voltage arc work found only one line and gives its wave-length as 2024.33.

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