Abstract
The hyperfine structure of the metastable states of the 6s5d configuration of135Ba and137Ba has been studied by the atomic-beam magnetic resonance (ABMR) method. The metastable barium states were populated in a plasma-discharge inside the atomic-beam oven. The atoms emerging from the ABMR-apparatus were detected by the use of a dyelaser. Compared to conventional methods this technique has the advantage of being state selective. The following magnetic dipole and electric quadrupole interaction constantsa andb have been obtained:137Ba:a(3 D 1)=−520.536 (3) MHzb(3 D 1)=17.890 (3) MHza(3D2=415.928 (3) MHzb(3D2)=25.899 (13) MHza(3D3)=456.559 (4) MHzb 3D3=47.390 (16) MHz135Ba:a 3 D 1=−465.166 (4) MHzb(3D1)=11.642 (4) MHza(3D2)=371.736(4) MHzb 3 D 2=16.745 (14) MHza(3D3)=408.038 (6) MHzb(3D3)=30.801 (24) MHz
Using these constants and the earlier known ones for the1 D 2 state the hyperfine structure for the 6s5d configuration has been analyzed with an effective hyperfine hamiltonian. Hyperfine parameters obtained from the analysis have been compared with theoretical values calculated with relativistic self-consistent-field (SCF) wavefunctions. The quadrupole moments have been evaluated with the following result Q(135Ba) =0.20(3)b and Q(137Ba) = 0.34(4)b uncorrected for the quadrupole shielding.
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The authors gratefully acknowledge support and stimulating discussions with Professor I. Lindgren and Docent S. Svanberg. Financial support from the Swedish Natural Science Research Council is gratefully recognized.
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Gustavsson, M., Olsson, G. & Rosén, A. Hyperfine-structure investigation in the 6s5d configuration of135Ba and137Ba. Z Physik A 290, 231–243 (1979). https://doi.org/10.1007/BF01408538
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DOI: https://doi.org/10.1007/BF01408538