Deceleration and Trapping of SrF Molecules

Aggarwal, Parul; Yin, Yanning; Esajas, Kevin; Bethlem, Hendrick L.; Boeschoten, Alexander; Borschevsky, Anastasia; Hoekstra, Steven; Jungmann, Klaus-Peter; Marshall, Virginia R.; Meijknecht, Thomas; Mooij, Maarten C.; Timmermans, Robertus; Touwen, A.; Ubachs, Wim; Willmann, Lorenz; e<, mtext>; Edm<, mi>; mrow,

doi:10.1103/physrevlett.127.173201

Cited by 24 publications

(26 citation statements)

References 55 publications

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“…These experiments can benefit from increased coherence times due to trapping or use of a fountain [316,330]. Coherence time can also be increased via molecular beam brightening and/or slowing using a combination of optical [285,286], electric [331], and magnetic [332] methods.…”

Section: Advanced Molecular Cooling Methodsmentioning

confidence: 99%

Electric dipole moments and the search for new physics

Alarcón¹,

Alexander²,

Anastassopoulos³

et al. 2022

Preprint

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Static electric dipole moments of nondegenerate systems probe mass scales for physics beyond the Standard Model well beyond those reached directly at high energy colliders. Discrimination between different physics models, however, requires complementary searches in atomic-molecular-and-optical, nuclear and particle physics. In this report, we discuss the current status and prospects in the near future for a compelling suite of such experiments, along with developments needed in the encompassing theoretical framework.

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Section: Advanced Molecular Cooling Methodsmentioning

confidence: 99%

Electric dipole moments and the search for new physics

Alarcón¹,

Alexander²,

Anastassopoulos³

et al. 2022

Preprint

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“…For laser slowing and capture of a small polyatomic molecule, up to 10 4 − 10 5 photons are typically needed. This threshold, however, can be decreased significantly via indirect slowing and cooling methods, such as Stark/Zeeman deceleration [109][110][111][112][113], optoelectric slowing and cooling schemes [114,115], as well as Zeeman-Sisyphus slowing [116,117], which can precede direct loading into a magnetic trap [118]. Magnetically assisted approaches to slowing and trapping may be especially well-suited for multi-electron OCCs due to the presence of high-spin ground and metastable electronic states, as further discussed in Sec.…”

Section: Pathways To Photon Cyclingmentioning

confidence: 99%

Multivalent optical cycling centers in polyatomic molecules

Yu¹,

López²,

Goddard³

et al. 2022

Preprint

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“…Finally, we note that there are deceleration techniques that avoid photon scattering altogether, or only require a small number of photons to be scattered. These include Stark deceleration which has recently been used to decelerate quite heavy molecules [39], Zeeman Sisyphus deceleration [40] recently demonstrated for polyatomic CaOH [41], and centrifuge deceleration [42]. If it proves difficult to close the leak from the cooling cycle, these slowing methods could be employed to bring molecules to rest.…”

Section: Transitionsmentioning

confidence: 99%

Inner-shell excitation in the YbF molecule and its impact on laser cooling

Zhang,

Cheng

et al. 2022

Preprint

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The YbF molecule is a sensitive system for measuring the electron's electric dipole moment. The precision of this measurement can be improved by direct laser cooling of the molecules to ultracold temperature. However, low-lying electronic states arising from excitation of a 4f electron may hinder laser cooling. One set of these "4f hole" states lies below the A 2 Π 1/2 excited state used for laser cooling, and radiative decay to these intermediate levels, even with branching ratios as small as 10 −5 , can be a hindrance. Other 4f hole states lie very close to the A 2 Π 1/2 state, and a perturbation results in states of mixed character that are involved in the laser cooling cycle. This perturbation may enhance the loss of molecules to states outside of the laser cooling cycle. We model the perturbation of the A 2 Π 1/2 state to determine the strength of the coupling between the states, the de-perturbed potential energy curves, and the radiative branching ratios to various vibrational levels of the ground state, X 2 Σ + . We use electronic structure calculations to characterise the 4f hole states and the strengths of transitions between these states and the A 2 Π 1/2 and X 2 Σ + states. We identify a leak out of the cooling cycle with a branching ratio of roughly 5 × 10 −4 , dominated by the contribution of the ground state configuration in a 4f hole state. Finally, we assess the impact of these results for laser cooling of YbF and molecules with similar structure.

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Deceleration and Trapping of SrF Molecules

Cited by 24 publications

References 55 publications

Electric dipole moments and the search for new physics

Electric dipole moments and the search for new physics

Multivalent optical cycling centers in polyatomic molecules

Inner-shell excitation in the YbF molecule and its impact on laser cooling

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