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Hyperfine structure of the 4f/sup 7/5d/sup 2/6s /sup 11/F term of /sup 155,157/Gd I by laser-rf double resonance

Journal Article · · Phys. Rev. A; (United States)

The atomic-beam laser-rf double-resonance method has been used to measure the hyperfine structure (hfs) of the J = 2--8 levels of the /sup 11/F term of 4f/sup 7/5d/sup 2/6s in /sup 155,157/Gd. Results are also reported for the J = 2,5 levels of the /sup 7/D term of 4f/sup 7/5d6s/sup 2/. Less precise hfs results are given for ten highly excited even-parity levels, and isotope shifts are given for 16 optical lines. L-S limit effective-operator expressions are given for the hfs A and B values of arbitrary states built from three open electron shells. When specialized to the /sup 11/F term in Gd I, these expressions reveal a marked perturbation between the J = 5 levels of 4f/sup 7/5d/sup 2/6s /sup 11/F and 4f/sup 7/5d6s/sup 2/ /sup 7/D. The perturbation can also be detected from the fine-structure intervals.

Research Organization:
Physics Division, Argonne National Laboratory, Argonne, Illinois 60439
DOE Contract Number:
W-31109-ENG-38
OSTI ID:
6320985
Journal Information:
Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 39:10; ISSN PLRAA
Country of Publication:
United States
Language:
English

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Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ATOMS
DOUBLE RESONANCE METHODS
ELECTRONIC STRUCTURE
ELEMENTS
ENERGY LEVELS
EXCITED STATES
GADOLINIUM
HYPERFINE STRUCTURE
ISOTOPE EFFECTS
LASER SPECTROSCOPY
METALS
RARE EARTHS
RF SYSTEMS
SPECTROSCOPY