Long-range states of the NaRb molecule near the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi mathvariant="normal">Na</mml:mi><mml:mo>(</mml:mo><mml:mn>3</mml:mn><mml:mi> </mml:mi><mml:mrow><mml:msup><mml:mrow /><mml:mn>2</mml:mn></mml:msup><mml:msub><mml:mi>S</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>/</mml:mo><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mo>)</mml:mo><mml:mo>+</mml:mo><mml:mi mathvariant="normal">Rb</mml:mi><mml:mo>(</mml:mo><mml:mn>5</mml:mn><mml:mi> </mml:

Zhu, Bing; Li, Xiaoke; He, Xiaodong; Guo, Minjie; Wang, Fudong; Véxiau, Romain; Bouloufa-Maafa, Nadia; Dulieu, Olivier; Wang, Dajun

doi:10.1103/physreva.93.012508

Cited by 11 publications

(13 citation statements)

References 38 publications

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“…Typically, the spectroscopy is done starting from a Feshbach molecule state, searching for excited states and the ground state by utilizing loss measurements including dark resonance (Autler-Townes) and dark state (electromagnetically induced transparency, EIT) effects. The findings are reported for example for 40 K 87 Rb [49], 23 Na 40 K [82], 23 Na 87 Rb [83,84] and 6 Li 40 K [85]. The excited states are chosen in a way that they provide a decent admixture of singlet and triplet character and therefore offer a good coupling strength to the mainly a 3 Σ + Feshbach molecule state as well as to the pure X 1 Σ + ground state.…”

Section: Ultracold Atomicmentioning

confidence: 99%

Ultracold Gas of Bosonic Na23K39 Ground-State Molecu

et al. 2020

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Ultracold bialkali polar molecules play a leading part at the frontline of quantum physics. They recently attract a lot of attention in the field of ultracold quantum chemistry, quantum many-body physics and quantum simulations. The key for their success is the rich internal level structure with rotational and vibrational degrees of freedom and their large electric dipole moments. Still, only a handful of molecular species are available at ultracold temperatures until now, although it is highly desirable to produce new molecular species to further expand the range of applications. Besides direct laser cooling methods for molecules, the assembly of heteronuclear groundstate molecules from ultracold atomic mixtures is the most promising approach for the creation of polar molecules. It includes the formation of weakly bound Feshbach molecules from the diatomic mixture and the subsequent two-photon stimulated Raman adiabatic passage (STIRAP) transfer to the rovibrational ground state. This creation strategy has been successfully demonstrated for the first time in the pioneering experiments at JILA with ultracold 40 K 87 Rb molecules. Since then, only a few more molecular species from different alkali atoms have been created, namely 6 Li 23 Na, 23 Na 40 K, 23 Na 87 Rb and 87 Rb 133 Cs.In this thesis, I report the successful creation of a new species of ultracold polar ground-state molecules: 23 Na 39 K. Starting from an ultracold mixture of bosonic 23 Na and 39 K atoms, weakly bound molecules are created. For this purpose, a Feshbach resonance in a high angular momentum scattering channel is chosen, experimentally identified and characterized. Close to this resonance the weakly bound Feshbach molecules are formed using resonant radio frequency radiation. For the two-photon ground-state transfer, a unique, highly specialized two-color laser system is designed and realized. It is used for one-and two-photon spectroscopy to identify the relevant transitions for the ground-state transfer. Based on the obtained data, a local model of the singlet-triplet mixed excited state manifolds is developed, with which the hyperfine structure and the magnetic field dependence is predicted with high accuracy. According to these findings, a suitable pathway to a single hyperfine ground state is chosen considering selection rules and experimental conditions such as laser polarization and beam alignment. To precisely determine the two-photon resonance condition for STIRAP, electromagnetically induced transparency measurements are performed. The ground-state transfer is then performed using STIRAP. The experimental findings regarding the STIRAP are successfully supported theoretically by a model based on a five-level master equation. The pure molecular gas shows evidence for two-body dominated loss mechanisms, such as sticky four-body collisions. The molecule-atom mixture of 23 Na 39 K+ 39 K reveals an unexpectedly low loss rate coefficient although sticky three-body collisions are assumed to occur. This behavior demands further investigat...

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Section: Ultracold Atomicmentioning

confidence: 99%

Ultracold Gas of Bosonic Na23K39 Ground-State Molecu

et al. 2020

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“…At intermolecular distances of 64.4a 0 and 50.7a 0 for the O = 0 + and the O = 1 state respectively, which are well within our spectroscopic reach, the contributions of the C 8 coefficients become significant and need to be included in the NDE formula. However, it has been suggested 32,62 that the precise value of the C 8 is hard to obtain accurately when fitting with the improved LeRoy-Bernstein NDE expression. Due to the limited number of measured lines for these states, accurate modeling with a NDE including a larger number of fitting parameters is not feasible.…”

Section: Near-dissociation Expansions and C 6 Coefficientsmentioning

confidence: 99%

“…29,30 Regarding the traditional three-level STIRAP scheme, obtaining the desired efficient ground state transfer necessitates a detailed understanding of the molecular structure and an extensive spectroscopic survey for the identification of a suitable electronically excited state. [31][32][33] Selection rules for electronic transitions, Franck-Condon overlap factors, mixing mechanisms between intermediate states and tuning capabilities of the available resources, are amongst some of the factors that need to be considered for making such a selection.…”

Section: Introductionmentioning

confidence: 99%

Empirical LiK excited state potentials: connecting short range and near dissociation expansions

Botsi¹,

Anmin²,

Lam³

et al. 2022

Phys. Chem. Chem. Phys.

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“…At intermolecular distances of 64.4 a 0 and 50.7 a 0 for the Ω=0 + and the Ω=1 state respectively, which are well within our spectroscopic reach, the contributions of the C 8 coefficients become significant and need to be included in the NDE formula. However, it has been suggested 32,62 that the precise value of the C 8 is hard to obtain accurately when fitting with the improved LeRoy-Bernstein NDE expression. Due to the limited number of measured lines for these states, accurate modeling with a NDE including a larger number of fitting parameters is not feasible.…”

Section: Near-dissociation Expansions and C 6 Coefficientsmentioning

confidence: 99%

“…Alternative production approaches include direct laser cooling of the sample from a buffer gas source 28 , and individual control of heavy neutral molecules in optical tweezers 29,30 . Regarding the traditional three-level STIRAP scheme, obtaining the desired efficient ground state transfer necessitates a detailed understanding of the molecular structure and an extensive spectroscopic survey for the identification of a suitable electronically excited state [31][32][33] . Selection rules for electronic transitions, Franck-Condon overlap factors, mixing mechanisms between intermediate states and tuning capabilities of the available resources, are amongst some of the factors that need to be considered for making such a selection.…”

Section: Introductionmentioning

confidence: 99%

Empirical LiK excited state potentials: connecting short range and near dissociation expansions

Botsi,

Yang,

Lam

et al. 2021

Preprint

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We report on a high-resolution spectroscopic survey of 6 Li 40 K molecules near the 2S + 4P dissociation threshold and produce a fully empirical representation for the B 1 Π potential by connecting available short-and long-range data. The purpose is to identify a suitable intermediate state for a coherent Raman transfer to the absolute ground state, and the creation of a molecular gas with dipolar interactions. Starting from weakly bound ultracold Feshbach molecules, the transition frequencies to twenty-six vibrational states are determined. Our data are combined with long-range measurements [Ridinger et al., EPL, 2011, 96, 33001], and near-dissociation expansions for the spin-orbit coupled potentials are fitted to extract the C 6 dispersion coefficients. A suitable vibrational level is identified by resolving its Zeeman structure and by comparing the experimentally attained g-factor to our theoretical prediction. Using mass-scaling of the short-range data for the B 1 Π [Pashov et al., Chem. Phys. Lett., 1998, 292, 615-620] and an updated value for its depth, we model the short-and the long-range data simultaneously and produce a Rydberg-Klein-Rees curve covering the entire range.

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Long-range states of the NaRb molecule near theNa(3 2S1/2)+Rb(5

Cited by 11 publications

References 38 publications

Ultracold Gas of Bosonic Na23K39 Ground-State Molecu

Ultracold Gas of Bosonic Na23K39 Ground-State Molecu

Empirical LiK excited state potentials: connecting short range and near dissociation expansions

Empirical LiK excited state potentials: connecting short range and near dissociation expansions

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