A precision, resonance absorption measurement has been made of the ratio of the magnetic moments of Tl²⁰⁵ and Tl²⁰³. The experimental ratio is μ²⁰⁵μ²⁰³=1.009838±0.000001. This result, when compared with the value observed by Berman for the ratio of hyperfine structure separations in the ²P1/2 state, Δν²⁰⁵Δν²⁰³=1.00974±0.00003, establishes the reality of effects attributable to the finite nuclear size.Shifts of about 0.2 percent have been found in the thallium resonance position in Tl⁺³ compared to Tl⁺¹ compounds. The resonance shifts in aqueous solutions varied linearly with the anion concentration. Complex formation and interionic electronic exchange interactions, respectively, account qualitatively for the observed effects.
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Gutowsky et al. (1953) studied this question.
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