Speaker
Description
We will present the current status of QED theory for hyperfine structure in hydrogenlike and heliumlike atoms in comparison to precision experimental results. For $^3$He$^+$ we use this comparison to obtain the nuclear polarizability effect. In the case of $^3$He atom we derive theoretical result for $2^3S$ hyperfine splitting with uncertainty of 41 Hz and observe excellent agreement with the experimental data. For $^{6,7}$Li$^+$ we use the comparison between theory and experiment to obtain the effective Zemach radius. We confirm the surprising result that the effective Zemach radius of $^6$Li is smaller than that of $^7$Li. Lastly, we use the results for the nuclear structure obtained from Li$^+$ to obtain accurate theoretical predictions for the hfs in $^{6,7}$Li$^{2+}$ for which no experimental data is available so far.
