Showing 1–7 of 7 results for author: Dorne, A

Nuclear Charge Radii of Sr Isotopes: Reevaluation based on Transition Frequency Measurements in the $5s-5p-4d$ manifold in Sr$^+$

Authors: J. Palmes, K. König, B. K. Sahoo, H. Bodnar, A. Candiello, A. Dorne, R. de Groote, P. Imgram, I. Lopp, P. Müller, W. Nörtershäuser, B. Ohayon, R. Van Duyse

Abstract: High-precision quasi-simultaneous collinear and anticollinear laser spectroscopy was performed on the $5s\,^2S_{1/2}\rightarrow 5p\,^2P_{1/2}$ (D1), $5s\,^2S_{1/2}\rightarrow 5p\,^2P_{3/2}$ (D2), and three $4d\rightarrow 5p$ transitions in the naturally abundant Sr$^+$ isotopes. Absolute transition frequencies were determined with uncertainties as low as $600$ kHz, while common-mode rejection enab… ▽ More High-precision quasi-simultaneous collinear and anticollinear laser spectroscopy was performed on the $5s\,^2S_{1/2}\rightarrow 5p\,^2P_{1/2}$ (D1), $5s\,^2S_{1/2}\rightarrow 5p\,^2P_{3/2}$ (D2), and three $4d\rightarrow 5p$ transitions in the naturally abundant Sr$^+$ isotopes. Absolute transition frequencies were determined with uncertainties as low as $600$ kHz, while common-mode rejection enabled the extraction of isotope shifts with uncertainties down to $200$ kHz, one order of magnitude smaller than previously achieved. The uncertainties of the hyperfine-structure constants of the $5p$ states and the $4d\,^2D_{3/2}$ state in $^{87}$Sr were also improved. A King-plot analysis yielded a field-shift ratio of the D2 and D1 lines of $F_{\mathrm{D2}}/F_{\mathrm{D1}}=1.004(5)$, which lies within the theoretically allowed region and provides a benchmark for atomic-structure calculations. Using data from all stable isotopes and investigated transitions, we compare field- and mass-shift constants obtained using several established approaches, ranging from King plots based entirely on experimental input to state-of-the-art \textit{ab initio} atomic-structure calculations. We show that, above $N=50$, the extracted charge radii depend strongly on the approach used. △ Less

Submitted 4 August, 2026; v1 submitted 5 May, 2026; originally announced May 2026.

Fresnel zone plates for reconfigurable atomic waveguides

Authors: A. M. Pike, A. Dorne, L. Pickering, M. Jamieson, I. T. MacCuish, E. Riis, M. Y. H. Johnson, V. A. Henderson, P. F. Griffin, A. S. Arnold

Abstract: Fresnel zone plates (FZPs), with patterns of $1\,μ$m resolution, allow the formation of clean, diffraction-limited foci -- but have a static phase profile. Spatial light modulators (SLMs) allow dynamic control of spatial beam intensity and phase -- but are bulky and currently limited to roughly $10\,μ$m pixel sizes and $1\,$Mega-pixel formats. Here, we present a new `best-of-both' kind of FZP, sca… ▽ More Fresnel zone plates (FZPs), with patterns of $1\,μ$m resolution, allow the formation of clean, diffraction-limited foci -- but have a static phase profile. Spatial light modulators (SLMs) allow dynamic control of spatial beam intensity and phase -- but are bulky and currently limited to roughly $10\,μ$m pixel sizes and $1\,$Mega-pixel formats. Here, we present a new `best-of-both' kind of FZP, scalable to large area rings currently incompatible with direct SLM generation. It is equivalent to a plano-convex donut lens, whereby light's local intensity and global phase at the FZP map directly onto the image plane. The same FZP under different SLM illumination can generate: rings and arcs, double-rings, phase windings and ring lattices (or dynamic combinations thereof). The smooth and adaptable near-field waveguide this enables will be ideal for Sagnac interferometry with ultracold atoms. △ Less

Submitted 25 June, 2026; v1 submitted 9 April, 2026; originally announced April 2026.

Comments: 10 pages, 5 figures, to appear in Optics Express

Laser spectroscopy and CP-violation sensitivity of actinium monofluoride

Authors: M. Athanasakis-Kaklamanakis, M. Au, A. Kyuberis, C. Zülch, K. Gaul, H. Wibowo, L. Skripnikov, L. Lalanne, J. R. Reilly, A. Koszorús, S. Bara, J. Ballof, R. Berger, C. Bernerd, A. Borschevsky, A. A. Breier, K. Chrysalidis, T. E. Cocolios, R. P. de Groote, A. Dorne, J. Dobaczewski, C. M. Fajardo Zambrano, K. T. Flanagan, S. Franchoo, J. D. Johnson , et al. (17 additional authors not shown)

Abstract: The apparent invariance of the strong nuclear force under combined charge conjugation and parity (CP) remains an open question in modern physics. Precision experiments with heavy atoms and molecules can provide stringent constraints on CP violation via searches for effects due to permanent electric dipole moments and other CP-odd properties in leptons, hadrons, and nuclei. Radioactive molecules ha… ▽ More The apparent invariance of the strong nuclear force under combined charge conjugation and parity (CP) remains an open question in modern physics. Precision experiments with heavy atoms and molecules can provide stringent constraints on CP violation via searches for effects due to permanent electric dipole moments and other CP-odd properties in leptons, hadrons, and nuclei. Radioactive molecules have been proposed as highly sensitive probes for such searches, but experiments with most such molecules have so far been beyond technical reach. Here we report the first production and spectroscopic study of a gas-phase actinium molecule, $^{227}$AcF. We observe the predicted strongest electronic transition from the ground state, which is necessary for efficient readout in searches of symmetry-violating interactions. Furthermore, we perform electronic- and nuclear-structure calculations for $^{227}$AcF to determine its sensitivity to various CP-violating parameters, and find that a realistic, near-term experiment with a precision of 1 mHz would improve current constraints on the CP-violating parameter hyperspace by three orders of magnitude. Our results thus highlight the potential of $^{227}$AcF for exceptionally sensitive searches of CP violation. △ Less

Submitted 7 July, 2025; originally announced July 2025.

Comments: Submitted

Journal ref: Nature 648 (2025) 562

Ionization potential of radium monofluoride

Authors: S. G. Wilkins, H. A. Perrett, S. M. Udrescu, A. A. Kyuberis, L. F. Pašteka, M. Au, I. Belošević, R. Berger, C. L. Binnersley, M. L. Bissell, A. Borschevsky, A. A. Breier, A. J. Brinson, K. Chrysalidis, T. E. Cocolios, B. S. Cooper, R. P. de Groote, A. Dorne, E. Eliav, R. W. Field, K. T. Flanagan, S. Franchoo, R. F. Garcia Ruiz, K. Gaul, S. Geldhof , et al. (21 additional authors not shown)

Abstract: The ionization potential (IP) of radium monofluoride (RaF) was measured to be 4.969(2)[10] eV, revealing a relativistic enhancement in the series of alkaline earth monofluorides. The results are in agreement with a relativistic coupled-cluster prediction of 4.969[7] eV, incorporating up to quantum electrodynamics corrections. Using the same computational methodology, an improved calculation for th… ▽ More The ionization potential (IP) of radium monofluoride (RaF) was measured to be 4.969(2)[10] eV, revealing a relativistic enhancement in the series of alkaline earth monofluorides. The results are in agreement with a relativistic coupled-cluster prediction of 4.969[7] eV, incorporating up to quantum electrodynamics corrections. Using the same computational methodology, an improved calculation for the dissociation energy ($D_{0}$) of 5.54[5] eV is presented. This confirms that radium monofluoride joins the small group of diatomic molecules for which $D_{0}>\mathrm{IP}$, paving the way for precision control and interrogation of its Rydberg states. △ Less

Submitted 21 October, 2024; v1 submitted 26 August, 2024; originally announced August 2024.

Observation of the distribution of nuclear magnetization in a molecule

Authors: S. G. Wilkins, S. M. Udrescu, M. Athanasakis-Kaklamanakis, R. F. Garcia Ruiz, M. Au, I. Belošević, R. Berger, M. L. Bissell, A. A. Breier, A. J. Brinson, K. Chrysalidis, T. E. Cocolios, R. P. de Groote, A. Dorne, K. T. Flanagan, S. Franchoo, K. Gaul, S. Geldhof, T. F. Giesen, D. Hanstorp, R. Heinke, T. Isaev, Á. Koszorús, S. Kujanpää, L. Lalanne , et al. (11 additional authors not shown)

Abstract: Rapid progress in the experimental control and interrogation of molecules, combined with developments in precise calculations of their structure, are enabling new opportunities in the investigation of nuclear and particle physics phenomena. Molecules containing heavy, octupole-deformed nuclei such as radium are of particular interest for such studies, offering an enhanced sensitivity to the proper… ▽ More Rapid progress in the experimental control and interrogation of molecules, combined with developments in precise calculations of their structure, are enabling new opportunities in the investigation of nuclear and particle physics phenomena. Molecules containing heavy, octupole-deformed nuclei such as radium are of particular interest for such studies, offering an enhanced sensitivity to the properties of fundamental particles and interactions. Here, we report precision laser spectroscopy measurements and theoretical calculations of the structure of the radioactive radium monofluoride molecule, $^{225}$Ra$^{19}$F. Our results allow fine details of the short-range electron-nucleus interaction to be revealed, indicating the high sensitivity of this molecule to the distribution of magnetization, currently a poorly constrained nuclear property, within the radium nucleus. These results provide a direct and stringent test of the description of the electronic wavefunction inside the nuclear volume, highlighting the suitability of these molecules to investigate subatomic phenomena. △ Less

Submitted 23 October, 2025; v1 submitted 7 November, 2023; originally announced November 2023.

Journal ref: Science 390(6771):386-389 (2025)

Pinning down electron correlations in RaF via spectroscopy of excited states and high-accuracy relativistic quantum chemistry

Authors: M. Athanasakis-Kaklamanakis, S. G. Wilkins, L. V. Skripnikov, A. Koszorús, A. A. Breier, O. Ahmad, M. Au, S. W. Bai, I. Belošević, J. Berbalk, R. Berger, C. Bernerd, M. L. Bissell, A. Borschevsky, A. Brinson, K. Chrysalidis, T. E. Cocolios, R. P. de Groote, A. Dorne, C. M. Fajardo-Zambrano, R. W. Field, K. T. Flanagan, S. Franchoo, R. F. Garcia Ruiz, K. Gaul , et al. (31 additional authors not shown)

Abstract: We report the spectroscopy of the 14 lowest excited electronic states in the radioactive molecule radium monofluoride (RaF). The observed excitation energies are compared with fully relativistic state-of-the-art Fock-space coupled cluster (FS-RCC) calculations, which achieve an agreement of >=99.64% (within ~12 meV) with experiment for all states. Guided by theory, a firm assignment of the angular… ▽ More We report the spectroscopy of the 14 lowest excited electronic states in the radioactive molecule radium monofluoride (RaF). The observed excitation energies are compared with fully relativistic state-of-the-art Fock-space coupled cluster (FS-RCC) calculations, which achieve an agreement of >=99.64% (within ~12 meV) with experiment for all states. Guided by theory, a firm assignment of the angular momentum and term symbol is made for 10 states and a tentative assignment for 4 states. The role of high-order electron correlation and quantum electrodynamics effects in the excitation energy of excited states is studied, found to be important for all states. Establishing the simultaneous accuracy and precision of calculations is an important step for research at the intersection of particle, nuclear, and chemical physics, including searches of physics beyond the Standard Model, for which RaF is a promising probe. △ Less

Submitted 20 December, 2024; v1 submitted 28 August, 2023; originally announced August 2023.

Comments: Significant changes compared to previous version with additional experimental data. Accepted for publication under a different title

Loading of a large Yb MOT on the $^1$S$_0$-$^1$P$_1$ transition

Authors: Hector Letellier, Álvaro Mitchell Galvão de Melo, Anaïs Dorne, Robin Kaiser

Abstract: We present an experimental setup to laser cool and trap a large number of Ytterbium atoms. Our design uses an oven with an array of microtubes for efficient collimation of the atomic beam and we implement a magneto-optical trap of $^{174}$Yb on the $^1$S$_0$-$^1$P$_1$ transition at 399nm. Despite the absence of a Zeeman slower, we are able to trap up to $N = 10^9$ atoms. We precisely characterize… ▽ More We present an experimental setup to laser cool and trap a large number of Ytterbium atoms. Our design uses an oven with an array of microtubes for efficient collimation of the atomic beam and we implement a magneto-optical trap of $^{174}$Yb on the $^1$S$_0$-$^1$P$_1$ transition at 399nm. Despite the absence of a Zeeman slower, we are able to trap up to $N = 10^9$ atoms. We precisely characterize our atomic beam, the loading rate of the magneto-optical trap and several loss mechanisms relevant for trapping a large number of atoms. △ Less

Submitted 1 August, 2023; originally announced August 2023.

Comments: 12 pages, 15 figures