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Articles by V. A. Dzuba
Nuclear clock based on the Th v ion
We propose that a nuclear clock based on the Th v ion can surpass the accuracy of clocks built with other thorium ions. The ion has a rigid closed-shell core with zero total electron angular momentum, suppressing frequency shifts from black-body radiation and stray external fields that act mainly on electrons.
Resonance nuclear excitation of the $^{229}\mathrm{Th}$ nucleus via electronic bridge process in Th ii
The 8.4-eV transition in the nucleus is the basis for a high-precision nuclear clock with exceptional sensitivity to new physics effects. We have identified several cases in the ion where electronic excitations closely resonate with the nuclear excitation, with the smallest energy difference being .
Highly charged ions of heavy actinides as sensitive probes for time variation of the fine-structure constant
Highly charged ions of heavy actinides from uranium to einsteinium are studied theoretically to find optical transitions sensitive to the variation of the fine-structure constant. A number of promising transitions have been found in ions with ionization degree ∼ 10. All these transitions correspond in single-electron approximation to the 6p−5f transitions.
${\mathrm{Cm}}^{15+}$ and ${\mathrm{Bk}}^{16+}$ ion clocks with enhanced sensitivity to new physics
We perform calculations of the electronic structure of Cm15+ and Bk16+ ions and demonstrate that they have transitions which combine the features of atomic optical clocks with the enhanced sensitivity to the variations of the fine-structure constant α. The high sensitivity is due to large nuclear charge Z, high ionization degree Zi, and the effect of level crossing, which enables optical transitions between states of different configurations.
Shift of nuclear clock transition frequency in $^{229}\mathrm{Th}$ ions due to hyperfine interaction
We calculate the hyperfine structure of Th229 and its ions (Th iv, Th iii, Th ii, Th i) to reveal the dependence of the nuclear clock frequency on the hyperfine interaction (HFI). We calculate first- and second-order HFI shifts and demonstrate that due to the differences in the hyperfine structure for different ions and for the ground and isomeric nuclear states the nuclear frequencies in Th iv, Th iii, Th ii, and Th i are also different.
${\mathrm{Os}}^{16+}$ and ${\mathrm{Ir}}^{17+}$ ions as candidates for accurate optical clocks sensitive to physics beyond the standard model
We perform detailed calculations of the electronic structure of the Os16+ ion and demonstrate that it has several metastable states which can be used for very accurate optical clocks.
Calculation of the hyperfine structure of Er and Fm
Abstract A version of the configuration interaction method, which has been recently developed to deal with a large number of valence electrons, has been used to calculate magnetic dipole and electric quadrupole hyperfine structure constants for a number of states of erbium and fermium. Calculations for fermium are done for extracting nuclear moments of Fm isotopes from recent and future measurements.
Prospects for optical clocks combining high sensitivity to new physics with insensitivity to perturbations: The case of ${\mathrm{Sb}}^{+}, {\mathrm{Au}}^{+}$, and ${\mathrm{Hg}}^{2+}$
Abstract Our study is motivated by the prospect of several metastable states in the Sb+,Au+, and Hg2+ ions being used as possible candidates for optical clocks. We calculate several atomic properties relevant to the development of optical clocks for those clock transitions using two different approaches of relativistic many-body calculations, i.e., configuration interaction with single-double coupled-cluster method and configuration interaction with perturbation theory method.
Calculation of the hyperfine structure of Dy, Ho, Cf, and Es
Abstract A recently developed version of the configuration interaction (CI) method for open shells with a large number of valence electrons has been used to study two heavy atoms, californium (Cf, Z=98) and einsteinium (Es, Z=99).
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