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The hyperfine spectrum of 38-y 2~ in the 6p 3 $3/2-6p ( Po)7SZP1/2 3,067-~ resonance line was measured by absorption spectroscopy. The 2~176 isotope shift is 0.0999 (20) cm-L. The relative isotope shifts in bismuth are found to follow the general pattern of the even-neutron number isotopes for the isotones with Z = 80, 81, 82 and 87. The magnetic dipole and electric quadrupole hfs interaction constants for ~~ A(4P1/2) =0.1630 (3) cm-1 and B(4S3/2) = -0.016 (3) cm-1, were obtained, Except for the isotope shift, these more precise values are in agreement with our previous results.

The hyperfine structure of the 3067-A line of 15-d 205 Bi was measured by optical spectroscopy. The results are A( i P i/2 ) = 166(4)x 10~3 cm" 1 , giving \x = 4.13(11)/^, and 192 (14) x 10" 3 cm" 1 for the 205 Bi-209 Bi isotope shift. A reexamination of the 207 Bi hfs shows accord with previous spectroscopic results \p. = 4.07(2)^] , but not with the recent nuclear orientation finding by Johnston, Kaplan, and Stone that ^( 207 Bi) is substantially larger than J U ( 209 Bi). Calculations of magnetic moments of odd bismuth isotopes, including configuration mixing and pion-exchange contributions, are in agreement with our experiments.