The hyperfine-induced $2s2p{}^{3}P_0–2s^2{}^{1}S_0$ transition rate for Be-like ${}^{47}\mathrm{Ti}^{18+}$ was recently measured in a storage-ring experiment by Schippers et al. [Phys. Rev. Lett. 98, 033001 (2007)]. The measured value of $0.56\left(3\right){\mathrm{s}}^{-1}$ is almost 60% larger than the theoretical value of $0.356{\mathrm{s}}^{-1}$ from a multiconfiguration Dirac-Fock calculation by Marques et al. [Phys. Rev. A 47, 929 (1993)]. In this work, we use a large-scale relativistic configuration-interaction method to calculate these hyperfine-induced rates for ions with $Z=6–92$. Coherent hyperfine-quenching effects between the $2s2p{}^{1,3}P_1$ states are included in a perturbative as well as a radiation damping approach. Contrary to the claims of Marques et al., contributions from the ${}^{1}P_1$ state are substantial and lead to a hyperfine-induced rate of $0.67{\mathrm{s}}^{-1}$, in better agreement with, though larger than, the measured value.

• Received 18 March 2008

DOI:https://doi.org/10.1103/PhysRevA.77.052504