Hyperfine structure of the (5d+6s)/sup 3/ configuration of /sup 139/La I: New measurements and ab initio multiconfigurational Dirac-Fock calculations
The atomic-beam laser-rf double-resonance method has been used to measure precisely the dipole and quadrupole hyperfine structure (hfs) of 11 levels of the 5d/sup 2/6s configuration and four levels of the 5d/sup 3/ configuration of /sup 139/La I. The results, together with earlier results for lower-lying levels, are compared in detail with new multiconfiguration Dirac-Fock (MCDF) ab initio calculations. The agreement is good to fair overall, but is poor in some areas. The comparison yields new insights and suggests areas in which the theoretical approach must be improved. In particular, the theory underestimates the importance of contact hfs in the 5d/sup 2/6s configuration by 25--40 %. In addition, there is at present no self-consistent way in the MCDF approach to take account of the large core polarization observed in the 5d/sup 3/ /sup 4/F term.
- Research Organization:
- Argonne National Laboratory, Argonne, Illinois 60439-4843
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 5596210
- Journal Information:
- Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Journal Issue: 1 Vol. 37:1; ISSN PLRAA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ATOMIC BEAMS
ATOMS
BEAM DYNAMICS
BEAM-BEAM INTERACTIONS
BEAMS
DATA
DOUBLE RESONANCE METHODS
ELECTROMAGNETIC RADIATION
ELECTRONIC STRUCTURE
ELEMENTS
EXPERIMENTAL DATA
FLUORESCENCE
HYPERFINE STRUCTURE
INFORMATION
LANTHANUM
LASER RADIATION
LUMINESCENCE
MEASURING METHODS
METALS
NUMERICAL DATA
RADIATIONS
RARE EARTHS