# DFT calculation of 229thorium-doped magnesium fluoride for nuclear laser spectroscopy

@article{Pimon2020DFTCO,
title={DFT calculation of 229thorium-doped magnesium fluoride for nuclear laser spectroscopy},
author={Martin Pimon and Johannes Gugler and Peter Mohn and G A Kazakov and Norbert J. Mauser and Thorsten Schumm},
journal={Journal of Physics: Condensed Matter},
year={2020},
volume={32}
}
• Published 4 March 2020
• Physics, Materials Science
• Journal of Physics: Condensed Matter
The 229thorium nucleus has an extremely low-energy isomeric state that could be manipulated with light in the vacuum ultraviolet (VUV) range. Recent measurements based on internal conversion electrons place the isomer energy at 8.28(17) eV (Seiferle B et al 2019), within the transmission window of large-band-gap materials, such as fluoride single crystals. Doping 229Th into VUV-transparent materials realizes a spectroscopy target with a high nuclei density and might form the basis of a solid…
7 Citations

### The thorium-229 low-energy isomer and the nuclear clock

• Physics
Nature Reviews Physics
• 2021
The 229Th nucleus has an isomeric state at an energy of about 8 eV above the ground state, several orders of magnitude lower than typical nuclear excitation energies. This has inspired the

### Nuclear clocks for testing fundamental physics

• Physics
Quantum Science and Technology
• 2021
The low-energy, long-lived isomer in 229Th, first studied in the 1970s as an exotic feature in nuclear physics, continues to inspire a multidisciplinary community of physicists. It has stimulated

### isomer: prospects for a nuclear optical clock

• Physics
• 2020
The proposal for the development of a nuclear optical clock has triggered a multitude of experimental and theoretical studies. In particular the prediction of an unprecedented systematic frequency

### Driven electronic bridge processes via defect states in Th229 -doped crystals

• Physics
• 2021
Brenden S. Nickerson, ∗ Martin Pimon, Pavlo V. Bilous, 1 Johannes Gugler, Georgy A. Kazakov, Tomas Sikorsky, Kjeld Beeks, Andreas Grüneis, 2 Thorsten Schumm, and Adriana Pálffy 1, †

### The $$^{229}$$Th isomer: prospects for a nuclear optical clock

• Physics
• 2020
The proposal for the development of a nuclear optical clock has triggered a multitude of experimental and theoretical studies. In particular the prediction of an unprecedented systematic frequency

### Stable Zn Metal Anodes with Limited Zn-Doping in MgF2 Interphase for Fast and Uniformly Ionic Flux

• Materials Science
Nano-micro letters
• 2022
A limitedly Zn-doped MgF 2 passivation layer consisting of a porous pure MgF 2 - and gradient Zn-doped MgF 2 -regions was developed for stable Zn metal anodes with excellent reversibility to 8000

### Observation of the radiative decay of the ${}^{229}\mathrm{Th}$ nuclear clock isomer

• Physics
• 2022
Sandro Kraemer, Janni Moens, Michail Athanasakis-Kaklamanakis, Silvia Bara, Kjeld Beeks, Premaditya Chhetri, Katerina Chrysalidis, Arno Claessens, Thomas E. Cocolios, João M. Correia, Hilde De Witte,

## References

SHOWING 1-10 OF 60 REFERENCES

### Oxidation State of 229 Th Recoils Implanted into MgF 2 Crystals

• Physics
• 2018
A solid-state nuclear clock based on the low-lying isomeric state in 229 Th has attracted growing interest. One potential problem for the solid-state nuclear clock approach is the suitability of the

### X-ray pumping of the 229Th nuclear clock isomer

• Physics
Nature
• 2019
Active optical pumping is presented using narrow-band 29-kiloelectronvolt synchrotron radiation to resonantly excite the second excited state of 229Th, which then decays predominantly into the isomer, enabling accurate determination of the 229mTh isomer’s energy, half-life and excitation linewidth.

### Laser spectroscopic characterization of the nuclear-clock isomer 229mTh

• Physics
Nature
• 2018
The laser spectroscopic investigation of the hyperfine structure of the doubly charged 229mTh ion and the determination of the fundamental nuclear properties of the isomer, namely, its magnetic dipole and electric quadrupole moments, as well as its nuclear charge radius are presented.

### Energy of the 229Th nuclear clock transition

• Physics
Nature
• 2019
The method combines nuclear and atomic physics measurements to advance precision metrology, and the findings are expected to facilitate the application of high-resolution laser spectroscopy on nuclei and to enable the development of a nuclear optical clock of unprecedented accuracy.

### Laser-induced electronic bridge for characterization of the 229mTh ⃗ 229gTh nuclear transition with a tunable optical laser

• Physics
• 2018
An alternative method to determine the excitation energy of the 229mTh isomer via the laser-induced electronic bridge is investigated theoretically. In the presence of an optical or ultra-violet

### Nuclear laser spectroscopy of the 3.5 eV transition in Th-229

• Physics
• 2003
We propose high-resolution laser spectroscopy of the 3.5 eV nuclear transition in Th-229 in isolated atoms. Laser excitation of the nucleus can be detected efficiently in a double-resonance method by

### Wigner crystals of 229Th for optical excitation of the nuclear isomer.

• Physics
Physical review letters
• 2011
A new value of the spectroscopic nuclear electric quadrupole moment Q=3.11(16) eb is deduced and is a step towards optical excitation of the low-lying isomer level in the 229Th nucleus.

### Results of a Direct Search Using Synchrotron Radiation for the Low-Energy (229)Th Nuclear Isomeric Transition.

• Physics
Physical review letters
• 2015
A direct search for the (229)Th-doped LiSrAlF(6) crystals is performed by exposing them to tunable vacuum-ultraviolet synchrotron radiation and observing any resulting fluorescence, finding no evidence for the thorium nuclear transition between 7.3 eV and 8.8 eV.

### Electronic structure of SnO2, GeO2, PbO2, TeO2 and MgF2

The band structures and densities of states for a number of non-transition-metal compounds with the rutile structure are calculated using a tight-binding method with scaled two-centre interactions.