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Europhys. Lett.
Volume 76, Number 6, December 2006
Page(s) 1074 - 1080
Section Atomic and molecular physics
Published online 16 November 2006
Europhys. Lett., 76 (6), pp. 1074-1080 (2006)
DOI: 10.1209/epl/i2006-10383-2

Reconciliation of experimental and theoretical electric tensor polarizabilities of the cesium ground state

S. Ulzega, A. Hofer, P. Moroshkin and A. Weis

Physics Department, University of Fribourg Chemin du Musée 3, 1700 Fribourg, Switzerland

received 4 September 2006; accepted in final form 19 October 2006
published online 16 November 2006

We present a new theoretical analysis of the strongly suppressed F- and M-dependent Stark shifts of the Cs ground-state hyperfine structure. Our treatment uses third-order perturbation theory including off-diagonal hyperfine interactions not considered in earlier treatments. A numerical evaluation of the perturbation sum using bound states up to n = 200 yields ground-state tensor polarizabilities $\alpha_2(6S_{1/2},F)$ which are in good agreement with experimental values, thereby bridging the 40-year-old gap between experiments and theory. We have further found that the tensor polarizabilities of the two ground-state hyperfine manifolds have opposite signs, in disagreement with an earlier derivation. This sign error has a direct implication for the precise evaluation of the blackbody radiation shift in primary frequency standards.

32.60.+i - Zeeman and Stark effects.
31.15.Md - Perturbation theory.
06.30.Ft - Time and frequency.

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