Recent progress in laser spectroscopy of the actinides

Block, M.; Laatiaoui, M.; Raeder, S.

doi:10.1016/j.ppnp.2020.103834

Cited by 40 publications

(15 citation statements)

References 242 publications

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“…The transitions target the excited 7s 2 8s 2 S1/2 level at 20 485 cm −1 with a transition strength of 3.31 × 10 7 s −1 , the excited 7s7p 2 4 P1/2 level at 25 381 cm −1 with a transition strength of 2.51 × 10 7 s −1 and the excited 7s 2 7d 2 D3/2 level at 28 580 cm −1 with a transition strength of 6.14 × 10 7 s −1 . For laser spectroscopy regarding the extraction of nuclear properties the latter transition to the 28 580 cm −1 state with J = 3/2 is beneficial due to a sensitivity to the nuclear spectroscopic quadrupole moment [1].…”

Section: Discussionmentioning

confidence: 99%

“…Optical spectroscopy of the heaviest elements can provide us with a wealth of information across various research disciplines. Such studies probe the atomic configuration and electronic structure of these atoms and give an insight into the trends in these properties, which are strongly affected by the relativistic effects [1][2][3]. Predictions of chemical behavior and material properties can also be derived from such spectroscopic studies; this is particularly important for the transfermium elements (Z > 100), where traditional chemical studies are presently beyond our reach [4].…”

Section: Introductionmentioning

confidence: 99%

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Ab initio calculations of the spectrum of lawrencium

et al. 2021

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We present high-accuracy relativistic investigations of the spectrum of Lr, element 103, prompted by the planned optical spectroscopy experiments on this rare and short-lived atom. Reliable predictions of the transition lines are important for the planning and success of these challenging measurements. The relativistic coupled cluster approach was used to calculate the energies of lowest excited states, while the combination of configuration-interaction method with the many-body perturbation theory was employed to address the higher-lying states and to obtain the transition strengths and the lifetimes of the levels of experimental interest. We performed similar calculations for Lu, the lighter homologue of Lr, where experimental data are available. For the lighter element, both the calculated energies and the Einstein coefficients are in excellent agreement with the previously measured values, confirming the accuracy of the performed calculations and the reliability of our predictions for Lr.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ab initio calculations of the spectrum of lawrencium

et al. 2021

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“…For example, low-dimensional heterostructures composed of actinide materials with 5f electrons, grown with interfaces containing tailored defect densities, represent a fertile area for the discovery of various emerging phenomena [241]. Studies have predicted a range of exotic physics for such structures, including highly correlated electron interactions [190,242], topological insulator behavior [195,198], and confined 2D properties [243,244].…”

Section: Future Directions: Thin Film Heterostructure Synthesis and C...mentioning

confidence: 99%

Advances in actinide thin films: synthesis, properties, and future directions

Vallejo¹,

Kabir²,

Poudel³

et al. 2022

Preprint

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Actinide-based compounds exhibit unique physics due to the presence of 5f electrons, and serve in many cases as important technological materials. Targeted thin film synthesis of actinide materials has been successful in generating high-purity specimens in which to study individual physical phenomena. These films have enabled the study of the unique electron configuration, strong mass renormalization, and nuclear decay in actinide metals and compounds. The growth of these films, as well as their thermophysical, magnetic, and topological properties, have been studied in a range of chemistries, albeit far fewer than most classes of thin film systems. This relative scarcity is the result of limited source material availability and safety constraints associated with the handling of radioactive materials. Here, we review recent work on the synthesis and characterization of actinide-based thin films in detail, describing both synthesis methods and modelling techniques for these materials. We review reports on pyrometallurgical, solution-based, and vapor deposition methods. We highlight the current state-of-the-art in order to construct a path forward to higher quality actinide thin films and heterostructure devices.

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“…Superheavy elements (SHEs) with atomic number Z > 103 are part of the seventh period. They do not occur on earth but are synthesized in single atom-at-a-time quantities [3,4]. Moreover, they are short lived so that their experimental investigation is also very challenging.…”

Section: Introductionmentioning

confidence: 99%

Electronic structure of Rf+ (Z=104) from ab initio calculations

et al. 2021

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We report calculation of the energy spectrum and the spectroscopic properties of the superheavy element ion: Rf + . We use the four-component relativistic Dirac-Coulomb Hamiltonian and the multireference configuration interaction model to tackle the complex electronic structure problem that combines strong relativistic effects and electron correlation. We determine the energies of the ground and the low-lying excited states of Rf + , which originate from the 7s 2 6d 1 , 7s 1 6d 2 , 7s 2 7p 1 , and 7s 1 6d 1 7p 1 configurations. The results are discussed vis-à-vis the lighter homolog Hf + ion. We also assess the uncertainties of the predicted energy levels. The main purpose of the presented calculations is to provide a reliable prediction of the energy levels and to identify suitable metastable excited states that are good candidates for the planned ion-mobility-assisted laser spectroscopy studies.

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Recent progress in laser spectroscopy of the actinides

Cited by 40 publications

References 242 publications

Ab initio calculations of the spectrum of lawrencium

Ab initio calculations of the spectrum of lawrencium

Advances in actinide thin films: synthesis, properties, and future directions

Electronic structure of Rf+ (Z=104) from ab initio calculations

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