Abstract
The hyperfine-structure separation of the state of 209Bi was measured in the 4722-Å transition with a grating spectrograph. The measurement was carried out because a precise value was required in our studies of the spectra of radioactive bismuth isotopes. Our result is . It differs from the previously quoted value of 830 mK, and agrees with a recent result of Dickie and Kelly.
© 1968 Optical Society of America
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