Blackbody Radiation Shift in a 43Ca+ Ion Optical Frequency Standard
B Arora, M S. Safronova, Charles W. Clark
Motivated by the prospect of an optical frequency standard based on 43Ca+, we calculate the blackbody radiation (BBR) shift of the 4s1/2 - 3d5/2 clock transition, which is a major component of the uncertainty budget. The calculations are based on the relativistic all-order single-double method where all single and double excitations of the Dirac-Fock wave function are included to allorders of perturbation theory. Additional calculations are conducted for the dominant contributions in order to evaluate some omitted high-order corrections and estimate the uncertainties of the final results. The BBR shift obtained for this transition is 0.38(1) Hz. The tensor polarizability of the 3d5/2 level is also calculated and its uncertainty is evaluated as well. Our results are compared withother calculations.
Physical Review Letters
atom trap, atomic clock, atomic structure, black-body optical frequency standard, calcium, polarizability, radiation, Stark effect
, Safronova, M.
and Clark, C.
Blackbody Radiation Shift in a <sup>43</sup>Ca<sup>+</sup> Ion Optical Frequency Standard, Physical Review Letters
(Accessed December 7, 2021)