Hyperfine quenching of the 2 s 2 p P 0 3 state of berylliumlike ions
Hyperfine quenching of the 2 s 2 p P 0 3 state of berylliumlike ions
复制标题
DOI：
10.1103/physreva.77.052504
复制
发表时间：
2008-05
影响因子：
2.9
通讯作者：
K. Cheng;M. Chen;W. Johnson
中科院分区：
文献类型：
--
作者：
K. Cheng;M. Chen;W. Johnson
The hyperfine-induced $2s2p\phantom{\rule{0.3em}{0ex}}^{3}P_{0}--2{s}^{2}\phantom{\rule{0.3em}{0ex}}^{1}S_{0}$ 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 $0.56(3)\phantom{\rule{0.3em}{0ex}}{\mathrm{s}}^{\ensuremath{-}1}$ is almost 60% larger than the theoretical value of $0.356\phantom{\rule{0.3em}{0ex}}{\mathrm{s}}^{\ensuremath{-}1}$ 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 $2s2p\phantom{\rule{0.3em}{0ex}}^{1,3}P_{1}$ 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 $0.67\phantom{\rule{0.3em}{0ex}}{\mathrm{s}}^{\ensuremath{-}1}$, in better agreement with, though larger than, the measured value.
The hyperfine-induced $2s2p\phantom{\rule{0.3em}{0ex}}^{3}P_{0}--2{s}^{2}\phantom{\rule{0.3em}{0ex}}^{1}S_{0}$ 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 $0.56(3)\phantom{\rule{0.3em}{0ex}}{\mathrm{s}}^{\ensuremath{-}1}$ is almost 60% larger than the theoretical value of $0.356\phantom{\rule{0.3em}{0ex}}{\mathrm{s}}^{\ensuremath{-}1}$ 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 $2s2p\phantom{\rule{0.3em}{0ex}}^{1,3}P_{1}$ 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 $0.67\phantom{\rule{0.3em}{0ex}}{\mathrm{s}}^{\ensuremath{-}1}$, in better agreement with, though larger than, the measured value.