Abstract
The hyperfine structure of157Gd was investigated in 20 Gd II lines by means of a photoelectric recording Fabry-Perot interferometer with digital data processing. The hyperfine splitting factors,A andB, were obtained by computer fits to the observed line structures. Using a multiconfigurational set of wave functions in intermediate coupling derived by Wyart, mono-electronic hyperfine parameters were deduced by a parametric treatment. The nuclear electric quadrupole moment of157Gd was evaluated from the quadrupole interaction of the 5d electron in 4f7 5d6s, the 5d electron in 4f7 5d6p, and the 6p electron in 4f7 5d6p. The three values obtained for the quadrupole moment agree very well. The final result, corrected for Sternheimer shielding, isQ(157Gd) =1.34(7)·10−24 cm2.
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