Physics – Atomic Physics
Scientific paper
1997-06-06
Phys. Rev. A, 47(6), (June 1993), pages 4725-4734
Physics
Atomic Physics
17 pages; LaTeX article; packages: amsmath,cite,epsfig; 10 figures, 43 references
Scientific paper
10.1103/PhysRevA.47.4725
The hyperfine structure of 5snd ^1D_2 states in ^{87}Sr was studied for principal quantum numbers 11 <= n <= 25 by Doppler-free two-photon excitation combined with thermionic detection. Based on the more accurate data, compared to previous results, the hyperfine structure was analysed by second order perturbation theory using MQDT wavefunctions. As a result we find that the surprisingly large B-factors obtained by fitting the data with the Casimir formula do not reflect a quadrupolar interaction but rather consist predominantly of second order magnetic dipole contributions. Further, inconsistencies in the King plot of odd-even isotope shifts were removed by this type of analysis. The result demonstrates the importance of higher order effects in hyperfine splittings of excited states in atoms with two valence electrons, even when the fine structure splitting is large compared to the hyperfine splitting.
Guedde J.
Klinkmueller A.
Matthias E.
West P. J.
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