Isotope Shifts of Radium Monofluoride Molecules

Udrescu, Silviu-Marian; Brinson, A. J.; Ruiz, R. F. Garcia; Gaul, Konstantin; Berger, Robert; Billowes, J.; Binnersley, C. L.; Bissell, M. L.; Breier, Alexander A.; Chrysalidis, K.; Cocolios, T. E.; Cooper, B. S.; Flanagan, Kieran; Giesen, Thomas; Groote, R. P. de; Franchoo, S.; Gustafsson, F. P.; Isaev, T. A.; Koszorús, Á.; Neyens, G.; Perrett, H. A.; Ricketts, C. M.; Rothe, S.; Vernon, A. R.; Wendt, Κ.; Wienholtz, F.; Wilkins, S. G.; Yang, Xiaofei

doi:10.1103/physrevlett.127.033001

Cited by 34 publications

(17 citation statements)

References 61 publications

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“…In addition to searches for P,T-violating effects, the systematic study of isotopologue shifts in the transition frequencies of RaF has demonstrated that the molecular electronic structure can be exceptionally sensitive to differences in the nuclear size between isotopes [9]. Therefore, particularly for unstable isotopes that either cannot be extracted from the ISOL target in atomic form, or whose study is significantly hindered by isobaric contamination, a possible experimental pathway for extending the current limits of laser spectroscopy for nuclear structure may utilize molecular beams to study nuclear size effects.…”

Section: Current Prospects For Experiments On Rafmentioning

confidence: 99%

On the Feasibility of Rovibrational Laser Cooling of Radioactive RaF+ and RaH+ Cations

Isaev

Wilkins

Athanasakis-Kaklamanakis

2021

Atoms

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Polar radioactive molecules have been suggested to be exceptionally sensitive systems in the search for signatures of symmetry-violating effects in their structure. Radium monofluoride (RaF) possesses an especially attractive electronic structure for such searches, as the diagonality of its Franck-Condon matrix enables the implementation of direct laser cooling for precision experiments. To maximize the sensitivity of experiments with short-lived RaF isotopologues, the molecular beam needs to be cooled to the rovibrational ground state. Due to the high kinetic energies and internal temperature of extracted beams at radioactive ion beam (RIB) facilities, in-flight rovibrational cooling would be restricted by a limited interaction timescale. Instead, cooling techniques implemented on ions trapped within a radiofrequency quadrupole cooler-buncher can be highly efficient due to the much longer interaction times (up to seconds). In this work, the feasibility of rovibrationally cooling trapped RaF+ and RaH+ cations with repeated laser excitation is investigated. Due to the highly diagonal nature between the ionic ground state and states in the neutral system, any reduction of the internal temperature of the molecular ions would largely persist through charge-exchange without requiring the use of cryogenic buffer gas cooling. Quasirelativistic X2C and scalar-relativistic ECP calculations were performed to calculate the transition energies to excited electronic states and to study the nature of chemical bonding for both RaF+ and RaH+. The results indicate that optical manipulation of the rovibrational distribution of trapped RaF+ and RaH+ is unfeasible due to the high electronic transition energies, which lie beyond the capabilities of modern laser technology. However, more detailed calculations of the structure of RaH+ might reveal possible laser-cooling pathways.

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Section: Current Prospects For Experiments On Rafmentioning

confidence: 99%

On the Feasibility of Rovibrational Laser Cooling of Radioactive RaF+ and RaH+ Cations

Isaev

Wilkins

Athanasakis-Kaklamanakis

2021

Atoms

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“…Collinear laser spectroscopy techniques are considered as powerful tools to perform systematic studies of atoms and molecules containing isotopes with shortlived unstable nuclei [1][2][3][4][5][6][7]. As the Doppler width, as seen along the axis of the motion of the atoms, is inversely proportional to the kinetic energy of the atoms [1], narrow Doppler width measurements of atomic spectra can be achieved by electrostatic acceleration.…”

Section: Introductionmentioning

confidence: 99%

Modelling of transient interference phenomena in collinear laser spectroscopy

Jovanović¹,

Ruiz²

2022

Preprint

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Collinear laser spectroscopy of fast atomic beams has been established as one of the main tools to perform precision experiments with atoms containing short-lived nuclei. Although highly sensitive, the spectral resolution of these techniques is typically limited to several MHz. Here, we study the use of transient interference phenomena to potentially improve the experimental resolution. Previous attempts to implement Ramsey-type measurements with fast beams were limited by the lack of understanding of the observed line shapes. By using a simple model, we provide a satisfactory description of the previously observed line shapes, and propose alternative experimental schemes to improve the resolution in fast ion-beam experiments.

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“…Moreover, spectroscopic results from studies of superheavy elements were recently reported, and in view of these developments, it is desirable to investigate EDMs using molecules with superheavy atoms. However, our experimental knowledge of such rare molecules is in its infancy, and theoretical developments are critical to motivate and guide experimental progress [23,24].…”

Section: Introductionmentioning

confidence: 99%

Towards CP -violation studies on superheavy molecules: Theoretical and experimental perspectives

Mitra

Prasannaa²,

Ruiz

et al. 2021

Phys. Rev. A

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Molecules containing superheavy atoms can be artificially created to serve as sensitive probes to study symmetry-violating phenomena. Here, we provide detailed theoretical studies of quantities relevant to the electron electric dipole moment (eEDM) and nucleus-electron scalar-pseudoscalar interactions in diatomic molecules containing superheavy lawrencium nuclei. The sensitivity to parity and time (or, equivalently, CP) reversal violating properties is studied for different neutral and ionic molecules. The effective electric fields in these systems are found to be about 3-4 times larger than other known molecules on which eEDM experiments are being performed. Similarly, these superheavy molecules exhibit an enhancement of more than 3 times for CP-violating scalar-pseudoscalar nucleus-electron interactions. Our preliminary analysis using the Woods-Saxon nuclear model also demonstrates that these results are sensitive to the diffuse surface interactions inside the Lr nucleus. We also briefly comment on some experimental aspects by discussing the production of these systems.

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Isotope Shifts of Radium Monofluoride Molecules

Cited by 34 publications

References 61 publications

On the Feasibility of Rovibrational Laser Cooling of Radioactive RaF+ and RaH+ Cations

On the Feasibility of Rovibrational Laser Cooling of Radioactive RaF+ and RaH+ Cations

Modelling of transient interference phenomena in collinear laser spectroscopy

Towards CP -violation studies on superheavy molecules: Theoretical and experimental perspectives

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