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Multiplicity in the spectra of cadmium I, II, and III Argyle, Sidney Charles

Abstract

A grating spectrograph has been constructed using a concave grating with a radius of curvature of 21.07 feet, and ruled at 600 lines/mm. on an aluminum surface. The plate holder, which is loaded in sections with 2 x 18 inch plates, is 13 feet long, and adequately covers the wave-length range from 2000 A to 15,000 A. A water cooled Schüler tube, a helium purifying system and a vacuum arc have also been built and put into operation. The above equipment has been used to investigate the spectra of cadmium, and 51 lines in Cd I and Cd II have been confirmed. Several promising lines , namely λ 4415.62, λ 3533.71 and λ 3250.11, due respectively to the transitions 5p ²P₁⁰[subscript ½] – 4d⁹ 5s² ²D₂[subscript ½], 5p ²P₁⁰[subscript ½] – 4d⁹ 5s² ²D₁[subscript ½], 5p ²P⁰[subscript ½] – 4d⁹ 5s² ²D₁[subscript ½] in Cd II have been carefully studied for isotope shift. The 21 foot grating used in this study had not sufficient resolving power to resolve any structure. A comprehensive table of wave-lengths has been compiled for Cadmium I, II and III.

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