2008/07/09 by S. G. Porsev, Andrew D. Ludlow, Martin M. Boyd +1
Medicine · Physics and Astronomy · #Advanced Frequency and Time Standards #Atomic and Subatomic Physics Research #Cardiovascular Syncope and Autonomic Disorders #physics.atom-ph #physics.gen-ph
paper · pdf · doi:10.1103/physreva.78.032508
published as Phys. Rev. A 78, 032508 (2008) · 9 pages, 2 figures, 5 tables
arxiv created 2008/07/09 · openalex publication_date 2008/09/05 · arxiv updated 2010/04/29 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We have carried out calculations towards the goal of reducing the inaccuracy of the Sr optical atomic clock to 1\ifmmode×\else\texttimes\fi10^\ensuremath-17 and below. In particular, we focused on ac polarizabilities of the 5s2 1S0 and 5s5p 3P0o clock states that are important for reducing the uncertainty of black-body radiation-induced frequency shifts for the 1S0\text\ensuremath-3P0o clock transition. Four low-lying even-parity states have been identified, whose total contribution to the static polarizability of the 3P0o clock state is at the level of 90%. We show that if the contribution of these states is experimentally known with 0.1% accuracy, the same accuracy can be achieved for the total polarizability of the 3P0o state. The corresponding uncertainty for the blackbody shift at a fixed room temperature will be below 1\ifmmode×\else\texttimes\fi10^\ensuremath-17. The calculations are confirmed by a number of experimental measurements on various Sr properties.