Abstract
Collinear fast-beam laser spectroscopy has been used to measure the hyperfine splittings and the isotope shifts in the 4${\mathit{p}}^{4}$4d $^{4}$${\mathit{D}}_{7/2}$--4${\mathit{p}}^{4}$5p $^{4}$P${\mathrm{\ifmmode^\circ\else\textdegree\fi{}}}_{5/2}$ (\ensuremath{\lambda}=729 nm) transition of singly ionized Kr. The measured isotope shifts are very large due to a large specific-mass effect that is caused by the strong momentum correlations of the 4d electron with the core electrons. Hartree-Fock and multiconfiguration Hartree-Fock (MCHF) calculations of the specific-mass shift were carried out and are compared to the measurements. The MCHF calculation yields excellent agreement with the experimental results.
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