Level Crossing Investigation of the Hyperfine Structure of Bi209 in the 6p^(2)(^(3)P_(0)) 6d^(2)D_(3/2) and 6p^(2)(^(3)P_(1)) 7s^(4)P_(3/2) Levels of the Bi I Spectrum

The level crossing method was used to measure the hyperfine structure of Bi 209 in the 6 p 2 ( 3 P 0 )6 d 2 D 3/2 and 6 p 2 ( 3 P 1 )7 s 4 P 3/2 levels of the Bi I spectrum. For the magnetic dipole and the electric quadrupole interaction constants a and b the following values were obtained: | a (6 p 2 ( 3 P 0 ) 6 d 2 D 3/2 )| = 128.0(0.6) g J /-0.79 MHz | b (6 p 2 ( 3 P 0 ) 6 d 2 D 3/2 )| = 58(4) g J /-0.79 MHz | a (6 p 2 ( 3 P 1 ) 7 s 4 P 3/2 )| = 95(4) MH