Journal
ATOMS
Volume 10, Issue 4, Pages -Publisher
MDPI
DOI: 10.3390/atoms10040123
Keywords
energy level; 5p-4f crossing; Nd9+ ion; highly charged ion clocks; multi-reference configuration interaction; CI+MBPT; lifetimes; magnetic-dipole hyperfine structure constant; electric dipole polarizability; variation of alpha; violation of the local Lorentz invariance
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Funding
- National Natural Science Foundation of China (NSFC) [11874064, 11934014, 12004392]
- Strategic Priority Research Program of the Chinese Academy of Sciences (CAS) [XDB21030300]
- NKRD Program of China [2021YFA1402104]
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In this study, the energy levels and atomic properties of the Nd9+ ion were investigated using high-accuracy relativistic ab initio calculations. The results show the existence of long-lived states suitable for narrow-linewidth clock lines. The evaluation of experimental systematics and relativistic sensitivity coefficients provide validation for the use of Nd9+ ion in high-resolution spectroscopy and precision fundamental studies.
The energy levels arising from the electronic orbital 5p-4f crossing between the ground 5p(2)4f and excited 5p4f(2) configurations in the Nd9+ ion are investigated by using high-accuracy relativistic ab initio calculations. The accurate atomic data of the lifetime, gJ factor, electric quadrupole moment, and hyperfine structure of the magnetic dipole are also presented. The long-lived states that are suitable for making narrow-linewidth (milli-Hz) clock lines are found. Dominant systematics caused by stray electromagnetic interactions in an experiment and the coefficients of the relativistic sensitivityto variation of the fine-structure constant alpha and of the Lorentz invariance violation are evaluated, thus validating that the Nd9+ ion can be a new candidate for high-resolution spectroscopy and precision fundamental studies for probing new physics beyond the Standard Model.
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