2012/10/26 by M. S. Safronova, S. G. Porsev, U. I. Safronova +2
Physics and Astronomy · #physics.atom-ph #physics.optics #quant-ph
paper · pdf · doi:10.1103/physreva.87.012509
9 pages
arxiv created 2012/10/26 · arxiv updated 2015/06/11
We evaluated the static and dynamic polarizabilities of the 5s2 1S0 and 5s5p 3P0o states of Sr using the high-precision relativistic configuration interaction + all-order method. Our calculation explains the discrepancy between the recent experimental 5s2 1S0 - 5s5p 3P0o dc Stark shift measurement Δα= 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.