Abstract
In order to extend the parametric description of the isotope shift to 5d-electrons in the lanthanides the IS of three GdII transitions (4f 75d6pz 10 F 11/2→4f 75d6sa 10 D9/2, 11/2, 13/2) was measured with enriched isotopes and natural composition of Gd in hollow cathodes. The values −99.75(30)mK, −100.15(25)mK and −101.90(50)mK were obtained for the IS (between156Gd and160Gd) from the lines 367.1 nm, 374.4 nm and 385.6 nm resp. From theJ-dependence of the IS found in the a10 D multiplet the crossed-second-order parameterz 5d =1.40 (35) mK was calculated. After normalization withδ〈r 2〉 andζ 5d the figurez 5d, norm =6.2(1.8)· 10−6 fm−2 agrees fully with the corresponding value from Eu I. This proves that theJ-dependence within a multiplet arises mainly from a crossed-second-order effect, which is originating from the field shift operator and operators of magnetic interactions.
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Dedicated to Prof. Dr. A. Steudel on the occasion of his 60th birthday
For permitting us to use the detailed finestructure calculations prior to publication we should like to thank J.-F. Wyart (Orsay, France). For the help in the experiments we are indebted to O. Will of our group.
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Kropp, J.R., Kronfeldt, H.D. & Winkler, R. J-dependence in the isotope-shift of the 4f 75d6s a10 D-term in the ground-configuration of Gd II. Z Physik A 321, 57–60 (1985). https://doi.org/10.1007/BF01411944
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DOI: https://doi.org/10.1007/BF01411944