Abstract
The hyperfine structure of the ground state 2 S 1/2 of sodium atom, Na 23 ( I =3/2), has been measured by a microwave absorption method by means of a Zeeman modulation spectrograph. Among seven lines of the Zeeman components, F =1→ F =2, six lines have been observed. The remaining one has not been obserbed since it is not affected by weak magnetic field. The hyperfine structure separation at zero magnetic field has been obtained from the results, and it is \begin{aligned} \varDelta\nu{=}1771.70{\pm}0.15 Mc/\text{sec}. \end{aligned} This is in good agreement with the known value measured by the atomic beam magnetic resonance method in the Paschen-Back region.
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