Abstract
Measurements of the hyperfine structures in the 6p5d 1 D 2,3 D 1 and3 F 2, 3, 4 states of135Ba and137Ba, and isotope-shifts in several far-red transitions between the 6s 5d and 6p 5d configurations, as well as the transition 6s 2 1 S 0→6s6p 3 P 1 at 7,911 Å have been performed using high-resolution laser spectroscopy on a collimated atomic beam of natural barium.
An analysis of the magnetic-dipole interaction in the 6p 5d configuration using effective one- and two-body hyperfine operators is presented. In particular the contact interaction was studied with respect to the correlation between the two valence electrons. Effects of strong configuration interaction were found.
From a King-plot analysis of the isotope shift term- andJ-dependence of the field shift have been evaluated for the transitions between the 6s 5d and 6p 5d configurations. Relativistic Hartree-Fock (RHF) calculations have been performed of electron densities at the nucleus for six different configurations in Ba I and Ba II. The RHF calculations reproduce the experimental King-plot slopes quite well, while the absolute values, of the changes in electron density at the nucleus for the studied transitions, are found to be 9% lower than the results derived from a muonic experiment.
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The constant support and discussions with Professor I. Lindgren and Dr. A. Rosén are gratefully acknowledged. The authors would also like to thank for the assistance by Dr. E. Eliel and L. Robertsson. Special thanks are given to A. van Leeuwen for supplying unpublished data on the 6,595 Å transition. This work was financially supported by the Swedish Natural Science Research Council.
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Grundevik, P., Gustavsson, M., Olsson, G. et al. Hyperfine-structure and isotope-shift measurements in the 6s 5d↔6p 5d transitions of Ba I in the far-red spectral region. Z Physik A 312, 1–9 (1983). https://doi.org/10.1007/BF01411655
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DOI: https://doi.org/10.1007/BF01411655