Laser-cooled molecules

Fitch, N. J.; Tarbutt, M. R.

doi:10.1016/bs.aamop.2021.04.003

Cited by 80 publications

(71 citation statements)

References 223 publications

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“…This method has been successfully applied to several neutral and ionic diatomic molecules [15][16][17][18][19] and could be easily extended to many other species, especially if they feature high vibrational branching ratios and are thus good candidates for laser cooling. As it is well established now, this is the case for alkaline earth monofluorides and monohydroxides [20]. It must be emphasized that high vibrational branching ratios favor optical pumping but are not a necessary condition.…”

Section: Introductionmentioning

confidence: 84%

Efficient rotational cooling of a cold beam of barium monofluoride

et al. 2022

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In our experiment, molecules of barium monofluoride, initially formed at high temperature due to a laser ablation process, are almost immediately cooled by an adiabatic expansion of argon. Our measurements show that the rotational temperature of the resulting molecular beam is about T_{{\rm rot}}\approx12 K. We demonstrate that the rotation can be cooled to approximately T_{{\rm rot}}\approx0.8 K through an optical pumping of the internal degrees of freedom. This optoical manipulation relies on two light sources coming from tapered amplifiers whose spectra extend over several tens of gigahertz. The first source, dedicated to the rotational cooling of molecules occupying the fundamental vibrational level, is optimized thanks to a spectral shaping whose resolution is comparable to the separation of the relevant rotational levels. The second source is used to pump the molecules back to the fundamental vibrational level when they escape from it. This work focuses on the relevant features of these two types of optical pumping.

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Section: Introductionmentioning

confidence: 84%

Efficient rotational cooling of a cold beam of barium monofluoride

et al. 2022

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“…Even more excitingly, AMO searches for fundamental symmetry violations offer realistic pathways to orders of magnitude of improvement in the not-too-distant future. First, modern molecular experiments are still relatively new, and recent advances such as laser cooling and trapping at ultracold temperatures [242][243][244][245], matrix isolation [246][247][248][249], and advanced control in molecular ion traps [250,251] offer orders of magnitude increases in sensitivity through improvements in coherence time and count rates of existing approaches. Second, heavy nuclei with octupole deformations can lead to enhanced sensitivity to hadronic CP-violation, up to a thousandfold larger than in spherical nuclei [102,103,241,252,253].…”

Section: B Relation Between Atom/molecule Cpv Energy Shifts and Under...mentioning

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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“…Accurate knowledge of excited state properties of atoms, ions, and molecules is necessary in many areas of precision physics for development of efficient laser cooling schemes [1], construction of ever more precise atomic clocks [2], investigations of highly charged ions [3], and symmetry violating studies in molecules [4]. In this context, the use of sophisticated ab initio theoretical methods is crucial for providing accurate and reliable predictions of various parameters where experiment is not yet available, for interpretation of measurements, and for development of novel and highly sensitive measurement schemes.…”

Section: Introductionmentioning

confidence: 99%

Benchmarking of the Fock space coupled cluster method and uncertainty estimation: Magnetic hyperfine interaction in the excited state of BaF

Denis,

Haase,

Mooij

et al. 2022

Preprint

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We present an investigation of the performance of the relativistic multi-reference Fock-space coupled cluster (FSCC) method for predicting molecular hyperfine structure (HFS) constants, including a thorough computational study to estimate the associated uncertainties. In particular, we considered the 19 F HFS constant in the ground and excited states of BaF. Due to a larger basis set dependence, the uncertainties on the excited state results (16-85%) were found to be significantly larger than those on the ground state constants (∼2%).The ab initio values were compared to the recent experimental results, and good overall agreement within the theoretical uncertainties was found. This work demonstrates the predictive power of the FSCC method and the reliability of the established uncertainty estimates, which can be crucial in cases where the calculated property cannot be directly compared to experiment.

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Laser-cooled molecules

Cited by 80 publications

References 223 publications

Efficient rotational cooling of a cold beam of barium monofluoride

Efficient rotational cooling of a cold beam of barium monofluoride

Electric dipole moments and the search for new physics

Benchmarking of the Fock space coupled cluster method and uncertainty estimation: Magnetic hyperfine interaction in the excited state of BaF

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