Measurement of Hyperfine Structure of the4S122State ofNa23by Cascade Radio-Frequency Spectroscopy

Abstract

The hyperfine structure of the $4{}_{}{}^2{}_{}{}^{}S_{\frac{1}{2}}^{}{}_{}{}^{}$ state of ${\mathrm{Na}}^{23}$ has been measured by the method of cascade radio-frequency spectroscopy. We find, for the magnetic dipole coupling constant, $A\left(4\mathrm{}{}_{}{}^2{}_{}{}^{}S_{\frac{1}{2}}^{}{}_{}{}^{}\right)=202\mathrm{}\pm 3$ MHz.