Rovibrational dynamics of the strontium molecule in the ${\rm A}\sideset{^1}{_{u}^{+}}{\Sigma}$AΣu+1, c3Π<i>u</i>, and ${\rm a}\sideset{^3}{_{u}^{+}}{\Sigma}$aΣu+3 manifold from state-of-the-art <i>ab initio</i> calculations

Skomorowski, Wojciech; Pawłowski, Filip; Koch, Christiane P.; Moszyński, Robert

doi:10.1063/1.4713939

Cited by 69 publications

(109 citation statements)

References 78 publications

(108 reference statements)

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“…The potential energy curves for the electronically excited A 1 Σ + u , c 3 Π u , and a 3 Σ + u manifold, spin-orbit coupling functions and transition dipole matrix elements are found in Ref. [14]. We investigate photoassociation into the lowest level below the 1 S + 3 P asymptote that was previously observed (v ′ = −6) [10].…”

Section: Theoretical Frameworkmentioning

confidence: 99%

“…Non-resonant light couples to the anisotropic polarizability of an atom pair, shifting the position of shape resonances to lower energies [13] and increasing the resonance's thermal weight in an ultracold trap. Below we demonstrate an enhancement by three orders of magnitude in the photoassociation rate of strontium, a molecule which is currently attracting considerable attention [11,12,14,15]. Photoassociation relies only on the presence of optical transitions which usually are abundant.…”

Section: Introductionmentioning

confidence: 99%

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Enhancing photoassociation rates by nonresonant-light control of shape resonances

González‐Férez

Koch

2012

Phys. Rev. A

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Photoassociation, assembling molecules from atoms using laser light, is limited by the low density of atom pairs at sufficiently short interatomic separations. Here, we show that non-resonant light with intensities of the order of 10 10 W/cm 2 modifies the thermal cloud of atoms, enhancing the Boltzmann weight of shape resonances and pushing scattering states below the dissociation limit. This leads to an enhancement of photoassociation rates by several orders of magnitude and opens the way to significantly larger numbers of ground state molecules in a thermal ensemble than achieved so far.

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Section: Theoretical Frameworkmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhancing photoassociation rates by nonresonant-light control of shape resonances

González‐Férez

Koch

2012

Phys. Rev. A

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“…It is well-known that due to configuration mixing the SO couplings vary with the internuclear distance and can be reduced or enhanced typically by 30-50% compared to the atomic values. Examples can be found for instance in spectroscopic studies of RbCs [81], KCs [60], or in quantum chemistry studies of Sr 2 [82], SrYb [83] or Rb 2 [84]. It is beyond the goal of this paper to compute the R-dependence of the SO coupling in RbSr.…”

Section: Higher Excited Statesmentioning

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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“…We demonstrate this with the PA of atoms in an 88 Sr condensate [20] to the second least bound vibrational level on the 1 S 0 + 3 P 1 molecular potential (Fig. 1) [31,32], which has a binding energy of h × 24 MHz [33] with the Planck constant h and transition natural linewidth of γ m /2π =15 kHz. Because the state is weakly bound and the C 3 coefficient of the molecular potential is small, the Franck-Condon factor for the transition is large, leading to a large optical length ℓ opt = M 4π 2 |w| 2 γm [34].…”

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confidence: 99%

Rabi Oscillations between Atomic and Molecular Condensates Driven with Coherent One-Color Photoassociation

et al. 2013

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We demonstrate coherent one-color photoassociation of a Bose-Einstein condensate, which results in Rabi oscillations between atomic and molecular condensates. We attain atom-molecule Rabi frequencies that are comparable to decoherence rates by driving photoassociation of atoms in an 88 Sr condensate to a weakly bound level of the metastable 1 S0+ 3 P1 molecular potential, which has a long lifetime and a large Franck-Condon overlap integral with the ground scattering state. Transient shifts and broadenings of the excitation spectrum are clearly seen at short times, and they create an asymmetric excitation profile that only displays Rabi oscillations for blue detuning from resonance.Coherent conversion of atoms into molecules in quantum degenerate gases provides a path to create molecular condensates, and it is also of fundamental interest because of the complex dynamics of many-body systems with nonlinear couplings [1]. It has been demonstrated with magnetic-field ramps near a magnetic Feshbach resonance (MFR) [2,3] and with different configurations of two-color photoassociation (PA) [4][5][6][7]. Coherent onecolor PA has typically been considered inaccessible due to the short lifetime of excited molecular states in alkalimetal atoms [8]. In addition, the observation of giant Rabi oscillations between atomic and molecular condensates has remained elusive, although it has been discussed extensively since the earliest days of the study of quantum gases [8][9][10][11][12][13][14][15][16][17][18][19]. Here, we demonstrate coherent, one-color PA and Rabi oscillations between atomic and molecular condensates. We also observe transient shifts and broadenings of the excitation spectra at short times and indications of universal dynamics on resonance [8], all of which have not been experimentally studied previously. We access the coherent regime by photoassociating atoms in an 88 Sr condensate [20] to a weakly bound level of the metastable 1 S 0 + 3 P 1 molecular potential. This yields a long molecular lifetime and a large Franck-Condon overlap integral between ground and excited states, which allows atom-molecule coupling to exceed loss and decoherence rates. [6,28]. These two-color processes are typically coherent, as demonstrated, for example, by the suppression of PA loss [4]. Rabi oscillations between atomic and ground molecular condensates driven by twocolor PA [12,[14][15][16] have never been observed, even in optical lattices [5], although two-photon Raman coupling was recently used to observe Rabi oscillations in a degenerate Fermi gas [29]. Spontaneous Raman scattering by molecules presents a formidable challenge to accessing a regime in which the two-photon coupling exceeds the decoherence rate [5].Coherence seems even less accessible in one-color PA because of the short lifetime of excited molecular states. Simply increasing the laser intensity and atom-molecule Rabi frequency does not necessarily offer a solution because transfer of population to noncondensate atomic states becomes dominant at high laser cou...

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Rovibrational dynamics of the strontium molecule in the ${\rm A}\sideset{^1}{_{u}^{+}}{\Sigma}$AΣu+1, c3Πu, and ${\rm a}\sideset{^3}{_{u}^{+}}{\Sigma}$aΣu+3 manifold from state-of-the-art ab initio calculations

Cited by 69 publications

References 78 publications

Enhancing photoassociation rates by nonresonant-light control of shape resonances

Enhancing photoassociation rates by nonresonant-light control of shape resonances

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

Rabi Oscillations between Atomic and Molecular Condensates Driven with Coherent One-Color Photoassociation

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