Prospects for transferring<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mrow /><mml:mn>87</mml:mn></mml:msup><mml:msup><mml:mi>Rb</mml:mi><mml:mn>84</mml:mn></mml:msup><mml:mi>Sr</mml:mi></mml:math>dimers to the rovibrational ground state based on calculated molecular structures

Chen, Tao; Zhu, Shaobing; Li, Xiaolin; Qian, Jun; Wang, Yuzhu

doi:10.1103/physreva.89.063402

Cited by 22 publications

(17 citation statements)

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“…e Fixed during the fit at the corresponding theoretical value. path for RbSr molecules towards the rovibronic ground state [35]. With such molecules available, one can run quantum simulations [4][5][6][7], perform fundamental tests of physics [11][12][13], and study chemical reactions with full control over reactants at the quantum level [7,[14][15][16][17].…”

Section: Discussionmentioning

confidence: 99%

The RbSr²Σ⁺ground state investigatedviaspectroscopy of hot and ultracold molecules

Ciamei

Szczepkowski

Bayerle

et al. 2018

Phys. Chem. Chem. Phys.

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We report on spectroscopic studies of hot and ultracold RbSr molecules, and combine the results in an analysis that allows us to fit a potential energy curve (PEC) for the X(1) 2 Σ + ground state bridging the short-to-long-range domains. The ultracold RbSr molecules are created in a µK sample of Rb and Sr atoms and probed by two-colour photoassociation spectroscopy. The data yield the long-range dispersion coefficients C6 and C8, along with the total number of supported bound levels. The hot RbSr molecules are created in a 1000 K gas mixture of Rb and Sr in a heat-pipe oven and probed by thermoluminescence and laser-induced fluorescence spectroscopy. We compare the hot molecule data with spectra we simulated using previously published PECs determined by three different ab-initio theoretical methods. We identify several band heads corresponding to radiative decay from the B(2) 2 Σ + state to the deepest bound levels of X(1) 2 Σ + . We determine a mass-scaled high-precision model for X(1) 2 Σ + by fitting all data using a single fit procedure. The corresponding PEC is consistent with all data, thus spanning short-to-long internuclear distances and bridging an energy gap of about 75% of the potential well depth, still uncharted by any experiment. We benchmark previous ab-initio PECs against our results, and give the PEC fit parameters for both X(1) 2 Σ + and B(2) 2 Σ + states. As first outcomes of our analysis, we calculate the s-wave scattering properties for all stable isotopic combinations and corroborate the locations of Fano-Feshbach resonances between alkali Rb and closed-shell Sr atoms recently observed [Barbé et al., Nat. ]. These results and more generally our strategy should greatly contribute to the generation of ultracold alkali -alkaline-earth dimers, whose applications range from quantum simulation to state-controlled quantum chemistry.

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Section: Discussionmentioning

confidence: 99%

The RbSr²Σ⁺ground state investigatedviaspectroscopy of hot and ultracold molecules

Ciamei

Szczepkowski

Bayerle

et al. 2018

Phys. Chem. Chem. Phys.

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“…To the knowledge of the authors only two other molecules of our set besides RbSr have been studied experimentally, namely LiCa [37,46,47] and RbCa [41]. On the purely theoretical side, several publications can be found for LiCa [18,42,[48][49][50][51][52], NaCa [42,44,53], KCa [42,44] RbCa [41,42,44], LiSr [18,42,[49][50][51][52][53], NaSr [42,44,53], KSr [42,44,53], and RbSr [40,42,44,[53][54][55].…”

Section: Introductionmentioning

confidence: 99%

Vibronic transitions in the alkali-metal (Li, Na, K, Rb) – alkaline-earth-metal (Ca, Sr) series: A systematic analysis of de-excitation mechanisms based on the graphical mapping of Frank-Condon integrals

et al. 2017

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Research on ultracold molecules has seen a growing interest recently in the context of high-resolution spectroscopy and quantum computation. After forming weakly bound molecules from atoms in cold collisions, the preparation of molecules in low vibrational levels of the ground state is experimentally challenging, and typically achieved by population transfer using excited electronic states. Accurate potential energy surfaces are needed for a correct description of processes such as the coherent de-excitation from the highest and therefore weakly bound vibrational levels in the electronic ground state via couplings to electronically excited states. This paper is dedicated to the vibrational analysis of potentially relevant electronically excited states in the alkali-metal (Li, Na, K, Rb)-alkaline-earth metal (Ca,Sr) diatomic series. Graphical maps of Frank-Condon overlap integrals are presented for all molecules of the group. By comparison to overlap graphics produced for idealized potential surfaces, we judge the usability of the selected states for future experiments on laser-enhanced molecular formation from mixtures of quantum degenerate gases.

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“…The second stage involves a STIRAP transfer from the weakly bound ground vibrational level to the rovibrational ground state. We find that it is in many cases possible to select an intermediate excited state where the product of the two relevant Franck-Condon factors is sufficient to achieve high STIRAP efficiencies [83]. The favorable FranckCondon factors are thanks to the much shorter equilibrium distance of the 1 2 Π excited state compared to the ground state.…”

Section: Discussionmentioning

confidence: 95%

“…Following a similar analysis of the RbSr system of Chen et al [83], in Fig. 9 we show the products of Franck-Condon factors for the two transitions between the initial ground vibrational states v and target rovibrational ground state as a function of the intermediate excited vibrational state v .…”

Section: Stirapmentioning

confidence: 99%

Optical Feshbach resonances and ground-state-molecule production in the RbHg system

et al. 2017

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We present the prospects for photoassociation, optical control of interspecies scattering lengths and finally, the production of ultracold absolute ground state molecules in the Rb+Hg system. We use the "gold standard" ab initio methods for the calculations of ground (CCSD(T)) and excited state (EOM-CCSD) potential curves. The RbHg system, thanks to the wide range of stable Hg bosonic isotopes, offers possibilities for mass-tuning of ground state interactions. The optical lengths describing the strengths of optical Feshbach resonances near the Rb transitions are favorable even at large laser detunings. Ground state RbHg molecules can be produced with efficiencies ranging from about 20% for deeply bound to at least 50% for weakly bound states close to the dissociation limit. Finally, electronic transitions with favorable Franck-Condon factors can be found for the purposes of a STIRAP transfer of the weakly bound RbHg molecules to the absolute ground state using commercially available lasers.

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Prospects for transferring87Rb84Srdimers to the rovibrational ground state based on calculated molecular structures

Cited by 22 publications

References 74 publications

The RbSr²Σ⁺ground state investigatedviaspectroscopy of hot and ultracold molecules

The RbSr²Σ⁺ground state investigatedviaspectroscopy of hot and ultracold molecules

Vibronic transitions in the alkali-metal (Li, Na, K, Rb) – alkaline-earth-metal (Ca, Sr) series: A systematic analysis of de-excitation mechanisms based on the graphical mapping of Frank-Condon integrals

Optical Feshbach resonances and ground-state-molecule production in the RbHg system

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Prospects for transferring87Rb84Srdimers to the rovibrational ground state based on calculated molecular structures

Cited by 22 publications

References 74 publications

The RbSr2Σ+ground state investigatedviaspectroscopy of hot and ultracold molecules

The RbSr2Σ+ground state investigatedviaspectroscopy of hot and ultracold molecules

Vibronic transitions in the alkali-metal (Li, Na, K, Rb) – alkaline-earth-metal (Ca, Sr) series: A systematic analysis of de-excitation mechanisms based on the graphical mapping of Frank-Condon integrals

Optical Feshbach resonances and ground-state-molecule production in the RbHg system

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The RbSr²Σ⁺ground state investigatedviaspectroscopy of hot and ultracold molecules

The RbSr²Σ⁺ground state investigatedviaspectroscopy of hot and ultracold molecules