Hyperfine Structure in the Spectra of Sb, Sm, Hg, and Cd

Abstract

Using two samples that were enriched in ${\mathrm{Sb}}^{121}$ and ${\mathrm{Sb}}^{123}$, respectively, the hyperfine structure (hfs) of the spectrum of Sb ii was studied, and the quadrupole moments were determined to be $Q\left({\mathrm{Sb}}^{121}\right)=(-0.52\mathrm{}\pm 0.10)\times {10}^{-24\mathrm{}}$ ${\mathrm{cm}}^2$, $Q\left({\mathrm{Sb}}^{123}\right)=(-0.67\mathrm{}\pm 0.10)\times {10}^{-24\mathrm{}}$ ${\mathrm{cm}}^2$. Study of the hfs of the spectra of Sm i and Sm ii, using two samples enriched in ${\mathrm{Sm}}^{147}$ and ${\mathrm{Sm}}^{149}$, respectively, yielded the result that the nuclear spins of ${\mathrm{Sm}}^{147}$ and ${\mathrm{Sm}}^{149}$ are $\frac{7}{2}$ and their nuclear magnetic moments are $\mu \left({\mathrm{Sm}}^{147}\right)=-0.76\mathrm{}\pm 0.08$ nm and $\mu \left({\mathrm{Sm}}^{149}\right)=-0.64\mathrm{}\pm 0.06$ nm with $\frac{\mu \left({\mathrm{Sm}}^{147}\right)}{\mu \left({\mathrm{Sm}}^{149}\right)}=1.198\mathrm{}\pm 0.015$. Using a sample containing 1.5 percent of ${\mathrm{Hg}}^{196}$, the hfs of the line Hg ii $\lambda 6150$ was studied, and the existence of the ${\mathrm{Hg}}^{196}$ component was just observed. Shifts of the even isotopes in the lines Hg i $\lambda 5461$, Hg i $\lambda 6123$, and Hg iii $\lambda 4797$ were measured, and it was found that they follow the regularity mentioned earlier. Using natural cadmium, the hfs of the line Cd ii $\lambda 4415$ was studied, and the shift ${\mathrm{Cd}}^{114}$-${\mathrm{Cd}}^{116}$ was found to be anomalously small compared with the shift ${\mathrm{Cd}}^{112}$-${\mathrm{Cd}}^{114}$.