Hyperfine Structure of ^209Bismuth in the 6p^2(P3_0)7s P4_12 State*

Abstract
The hyperfine-structure separation of the 6p2(3P0)7s4P½ 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 Δv(4P½)= 819.5±3.1 mK. It differs from the previously quoted value of 830 mK, and agrees with a recent result of Dickie and Kelly.