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Blackbody-radiation shift in the Sr optical atomic clock

TitleBlackbody-radiation shift in the Sr optical atomic clock
Publication TypeJournal Article
Year of Publication2013
AuthorsM. S. Safronova, S. G. Porsev, U. I. Safronova, M. G. Kozlov, and C. W. Clark
JournalPhys. Rev. A
Date Publishedjan

We evaluated the static and dynamic polarizabilities of the 5s(2) S-1(0) and 5s5p P-3(0)0 states of Sr using the high-precision relativistic configuration interaction combined with the all-order method. Our calculation explains the discrepancy between the recent experimental 5s(2) S-1(0) - 5s5p P-3(0)0 dc Stark shift measurement Delta alpha = 247.379(7) \{[\}Middelmann et al., Phys. Rev. Lett. 109, 263004 (2012)] and the earlier theoretical result of 261(4) a.u. \{[\} Porsev and Derevianko, Phys. Rev. A 74, 020502(R) (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. DOI: 10.1103/PhysRevA.87.012509