Abstract
A COMPARISON of the two lines of spectroscopic evidence bearing on the properties of the atomic nucleus raises some interesting questions and suggests new directions of research. The magnetic moment of the nucleus can only be evaluated from hyperfine strucuture observations, and then only in favourable circumstances. The spin quatum number I can sometimes be obtained by bothe methods: by the hyperfine structure method if the magnetic moment and its interaction with the optical electrons is sufficiently large, and by the brand spectrum method if the atom is one which forms an elementary diatomic molecule, provided also that this gives rise to a band spectrum of which the rotation structure can be analysed. Although each method is thus restricted in the scope of its application, there are a number of cases in which both are applicable, for example, Li7, F19 and Na23, for each of which the tow values obtained for I are in agreement. On the other hand, P31, Cl35 and K39 are amenable only to the band spectrum method, the magnetic moment being presumably too small to give observable hyperfine structure whereas for many other nuclei for example, Cu63, 65, Cd111, 113, Cs133, Hg199, 201, etc.) the latter method only is applicable since no diatomic molecules giving rise to band spectra are known.
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CURTIS, W. Nuclear Spins and Magnetic Moments. Nature 133, 256 (1934). https://doi.org/10.1038/133256b0
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DOI: https://doi.org/10.1038/133256b0
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