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The isotope shifts in the singlet resonance line of CdI have been observed. The line was excited by electron bombardment of an atomic beam and the high resolution was obtained with a Fabry-Pérot interferometer. The shifts measured in this line (λ2288 Å) are compared with those previously measured in the intercombination resonance line (λ3261) to show that the specific mass effect is small. Comparisons are made with similar measurements in magnesium, zinc, and strontium.
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Kelly et al. (1961) studied this question.
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