Hyperfine structure of the (6p)3 configuration of Bi209

Abstract

By means of the atomic-beam-magnetic-resonance method we have measured the P322 level hfs and the P322 and P122 level gJ factors of the Bi209 (6p)3 ground configuration. Our experimental results are: A(P322)=491.028(1) MHz, B(P322)=978.639(9) MHz, C(P322)=0.0193(5) MHz, gJ(P122)=0.6654(2) and gJ(P322)=1.26083(12). In order to interpret these measurements, we have examined the fine structure and the hfs of all the (6p)3 levels. Our calculations show that the inclusion of spin-spin, orbit-orbit, and spin-other-orbit interactions do not improve the theoretical fit to the observed fine structure intervals. The effects of core polarization and relativity can be estimated by writing the dipole hfs Hamiltonian in the form H=2μμBI→•Îi[ã€̂rl-3〉 iI→i-10ã€̂rsC-3〉i(sC2)l(1)+ã €̂rs-3〉is→i] This analysis of the dipole hfs yields a value ã€̂r-3〉6p(hfs)=1.02×1026 cm2 compared to the fine structure result ã€̂r-3〉6p(fs)=1.25×1026 cm2. With these results we find Q=-0.383(40) b and Ω=0.55(3)μNb. © 1970 The American Physical Society.