Abstract
Doppler-free two-photon spectroscopy has been applied to investigate the hyperfine structures and the isotope shifts of 27 fine-structure levels of in the energy region between 34 400 and 36700 . With the experimental data the fine-structure calculations of Wyart have been widely confirmed, and two levels of the D term of the configuration 46s6d have been identified as e (35 282.22 ) and e (35 377.94 ).
With effective one-electron parameters and an analysis of the magnetic and electric hyperfine structure for the terms D, D, and of the configuration 46s6d was performed: =-50(13) MHz, =12 590 (90) MHz, =25(20) MHz, =0(2) MHz, =-4(2) MHz, =-30(20) MHz, and =+81(5) MHz. From the quadrupole moment Q(6d)=2.07(30) barn a Sternheimer quadrupole shielding factor was found to be R(6d)=-1.29(35). In addition, higher-order effects of the isotope shift could be explained in the same terms of 46s6d with the use of a parametric description. We obtained the following parameters: =-3140(80) MHz, =-5270(130) MHz, (4f,6d)=+1(3) MHz, (6d,6s)=-290(50) MHz, (4f,6s)=-36(2) MHz, and =6(4) MHz.
- Received 23 October 1990
DOI:https://doi.org/10.1103/PhysRevA.43.4837
©1991 American Physical Society