The hyperfine structure (hfs) of the spectrum of ytterbium was studied, using separated isotopes 171 and 173 as well as natural ytterbium. The nuclear moment ratio µ(171)/µ(173)=-0.7248±0.0008 was obtained; and from the known value of µ(171) the value µ(173)=-0.6802±0.0010 nm was obtained. The nuclear quadrupole moment of Yb 173 deduced from the levels 6 s 6 p 3 P 1 and 3 P 2 is 3.1±0.2 b without shielding correction. The method of the calculation is discussed.
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Ross et al. (1964) studied this question.