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3S1 Hyperfine-Structure Separations and Isotope Shifts of Radioactive Cd107, Cd109, and of Stable Cd Isotopes

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Abstract

High-resolution spectra of radioactive Cd107 (6.7 h) and Cd109 (470 days), and of Cd111 and Cd113 were obtained in the wavelengths λ=3261, 4678, 4800, and 5085 Å with the use of a 10-in. well-blazed plane diffraction grating mounted in the two-mirror (multiple-wavelength) monochromator of 40-ft focal length. The radioactive Cd107 and Cd109 were produced by bombarding natural silver foil with deuterons. The Cd111 and Cd113 electrodeless lamps were prepared from separated isotope samples. We find: Cd109–Cd113 isotope shift in the 3261-Å resonance line, 0.033±0.005 cm−1, with the sign of the volume-dependent isotope shift, and hfs separation in the 5s6s 3S1 state, Δν(Cd113)=−0.407±40.005 cm−1. (The single previously quoted value was obtained with natural Cd.) The three 5s6s to 5s5p 3P lines display isotope shifts that are smaller than the precision of the experiment. A factors of Cd107, Cd109, and Cd111 are obtained from the spectroscopic and the published resonance and level-crossing data. The isotope shift is studied in combination with the results of Kuhn and Ramsden, and those of Brix, Steudel, and Blaise, in the light of possible nuclear polarizability effects such as have been described by Tomlinson and Stroke in the case of mercury isotopes.

© 1963 Optical Society of America

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