Hyperfine Structure ofCs134m

The nuclear magnetic moment of ${\mathrm{Cs}}^{134m}$ has been measured independently of the electron-nucleus interaction energy $\Delta W$ by observing the separation of components of the doublet $(\frac{17}{2}, -\frac{13}{2})\leftrightarrow (\frac{15}{2}, -\frac{15}{2})$ and $(\frac{17}{2}, -\frac{15}{2})\leftrightarrow (\frac{15}{2}, -\frac{13}{2})$. The frequency difference $\delta \nu =2\mathrm{}{g}_I{\mu }_{0}H$ is observed in the vicinity of a frequency minimum for each transition. The value obtained for ${\mu }_I$ is 1.0964(2) nm corrected for atomic diamagnetism, giving a hfs anomaly between ${\mathrm{Cs}}^{133}$ and ${\mathrm{Cs}}^{134m}$ of -0.0139(2). The direct transition near zero field has been measured to give $\Delta \nu =3\mathrm{}684578640\left(175\right)\mathrm{}$ cps.