Molecular spectroscopy for ground-state transfer of ultracold RbCs molecules

Debatin, Markus; Takekoshi, T.; Rameshan, Raffael; Reichsöllner, Lukas; Ferlaino, Francesca; Grimm, Rudolf; Véxiau, Romain; Bouloufa, Nadia; Dulieu, Olivier; Nägerl, Hanns‐Christoph

doi:10.1039/c1cp21769k

Cited by 83 publications

(126 citation statements)

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“…In 2008 two groups have reported the formation of ultracold gases of polar LiCs and KRb molecules in ultracold temperatures [7,8]: ultracold LiCs molecules have been obtained by photoassociation of pairs of ultracold Li and Cs atoms and spontaneous decay of excited LiCs * molecule down to the electronic ground state, while ultracold KRb molecules have been created through magnetoassociation of ultracold K and Rb atoms into weakly bound levels of the molecular ground state, followed by stimulated Raman adiabatic passage (STIRAP) toward the lowest rovibrational level [9,10]. There is also a number of other experiments aiming at creating ultracold heteronuclear diatomic alkalimetal molecules in their ground state like RbCs [11,12] and NaK [13], since in contrast with KRb [14] they are stable with respect to the chemical reactions of atom exchange and trimer formation [15].…”

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confidence: 99%

Ground- and excited-state properties of the polar and paramagnetic RbSr molecule: A comparative study

2014

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This paper deals with the electronic structure of RbSr, a molecule possessing both a permanent magnetic and electric dipole moment in its own frame allowing its manipulation with external fields. Two complementary ab-initio approaches are used for the ground and lowest excited states: first, an approach relying on optimized effective core potentials with core polarization potentials based on a full configuration interaction involving three valence electrons, and second, an approach using a small-size effective core potential with 19 correlated electrons in the framework of coupled-cluster theory. We have found excellent agreement between these two approaches for the ground state properties including the permanent dipole moment. We have focused on studies of excited states correlated to the two lowest asymptotes Rb(5p 2 P )+Sr(5s 2 1 S) and Rb(5s 2 S)+Sr(5s5p 3 P ) relevant for ongoing experiments on quantum degenerate gases. We present also the Hund c) case potential curves obtained using atomic spin-orbit constants. These potential curves are an excellent starting point for experimental studies of molecular structure of RbSr using high-resolution spectroscopy.

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confidence: 99%

Ground- and excited-state properties of the polar and paramagnetic RbSr molecule: A comparative study

2014

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“…87 Rb 133 Cs molecules have been formed via magnetoassociation in both Innsbruck [28,29] and Durham [30,31]. The Innsbruck group [32] subsequently performed detailed one-and twophoton molecular spectroscopy and, very recently, reported the transfer of molecules to the rovibrational and hyperfine ground state by STIRAP [33].…”

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confidence: 99%

“…High transfer efficiency requires a high value of Ω 2 =γ for both transitions, where Ω is the Rabi frequency and γ is the natural linewidth. Debatin et al have identified several states suitable for STIRAP [32]. To locate the states, we pulse 20 μW of pump light, polarized parallel to the magnetic field, on the molecules in the jFi state for 750 μs.…”

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Creation of UltracoldRb87Cs133Molecules in the Rovibrational Ground Sta

et al. 2014

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Citation for published item:wolonyD eter uF nd qregoryD hilip hF nd tiD honghu nd vuD fo nd u¤ oppingerD wi h el F nd ve ueurD gF uth nd fl kleyD g roline vF nd rutsonD teremy wF nd gornishD imon vF @PHIRA 9gre tion of ultr old VU IQQgs mole ules in the rovi r tion l ground st teF9D hysi l review lettersFD IIQ @PSAF pF PSSQHIF Further information on publisher's website:httpXGGdxFdoiForgGIHFIIHQG hys evvettFIIQFPSSQHI Publisher's copyright statement:Reprinted with permission from the American Physical Society: Physical Review Letters 113, 255301 c 2014 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modi ed, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. We report the creation of a sample of over 1000 ultracold 87 Rb 133 Cs molecules in the lowest rovibrational ground state, from an atomic mixture of 87 Rb and 133 Cs, by magnetoassociation on an interspecies Feshbach resonance followed by stimulated Raman adiabatic passage (STIRAP). We measure the binding energy of the RbCs molecule to be hc × 3811.576ð1Þ cm −1 and the jv 00 ¼ 0; J 00 ¼ 0i to jv 00 ¼ 0; J 00 ¼ 2i splitting to be h × 2940.09ð6Þ MHz. Stark spectroscopy of the rovibrational ground state yields an electric dipole moment of 1.225(3)(8) D, where the values in parentheses are the statistical and systematic uncertainties, respectively. We can access a space-fixed dipole moment of 0.355(2)(4) D, which is substantially higher than in previous work.

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“…An attractive alternative is to form ground-state RbCs, which is expected to be collisionally stable because both the exchange reaction 2RbCs → Rb 2 + Cs 2 and trimer formation reactions are endothermic [14]. There has been considerable work on the Feshbach resonances [15] and molecule formation [16,17] in 87 Rb 133 Cs. However, this isotopologue has an interspecies background scattering length that is large and positive, which produces a spatial separation of the dual condensate [18] and enhances losses from three-body collisions [19,20].…”

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confidence: 99%