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arXiv · 1210.7272

Blackbody radiation shift in the Sr optical atomic clock

M. S. Safronova·S. G. Porsev·U. I. Safronova·M. G. Kozlov·Charles W. Clark
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Abstract

We evaluated the static and dynamic polarizabilities of the 5s^2 ^1S_0 and 5s5p ^3P_0^o states of Sr using the high-precision relativistic configuration interaction + all-order method. Our calculation explains the discrepancy between the recent experimental 5s^2 ^1S_0 - 5s5p ^3P_0^o dc Stark shift measurement \Delta \alpha = 247.374(7) a.u. [Middelmann et. al, arXiv:1208.2848 (2012)] and the earlier theoretical result of 261(4) a.u. [Porsev and Derevianko, Phys. Rev. A 74, 020502R (2006)]. Our present value of 247.5 a.u. is in excellent agreement with the experimental result. We also evaluated the dynamic correction to the BBR shift with 1 % uncertainty; -0.1492(16) Hz. The dynamic correction to the BBR shift is unusually large in the case of Sr (7 %) and it enters significantly into the uncertainty budget of the Sr optical lattice clock. We suggest future experiments that could further reduce the present uncertainties.

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M. S. Safronova, S. G. Porsev, U. I. Safronova, M. G. Kozlov, Charles W. Clark. 2012-10-26. Blackbody radiation shift in the Sr optical atomic clock. https://doi.org/10.1103/physreva.87.012509

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