Transition energy and lifetime for the ground-state hyperfine splitting of high-Z lithiumlike ions

The ground-state hyperfine splitting values and the transition probabilities between the hyperfine structure components of high-Z lithiumlike ions are calculated in the range Z=49-83. The relativistic, nuclear, QED, and interelectronic interaction corrections are taken into account. It is found that the Bohr-Weisskopf effect can be eliminated in a combination of the hyperfine splitting values of the hydrogenlike and lithiumlike ions of an isotope. This gives a possibility for testing the QED effects in a combination of the strong electric and magnetic fields of the heavy nucleus. Using the experimental result for the 1s hyperfine splitting in Bi-209(82+), the 2s hyperfine splitting in Bi-209(80+) is calculated to be Delta E=0.7976(2) eV. [S1050-2947(97)05412-7].