Resonant coupling effects on the photoassociation of ultracold Rb and Cs atoms

Londoño, Beatriz; Mahecha, Jorge; Luc‐Koenig, E.; Crubellier, A.

doi:10.1103/physreva.80.032511

Cited by 15 publications

(18 citation statements)

References 73 publications

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“…70 Such a structure of the vibrational wavefunctions was shown to be ideally suited for efficient stabilization of the photoassociated molecules into deeply bound levels in the ground electronic state. [71][72][73][74] The Condon radius for photoassociation coincides with the classical outer turning point, i.e., roughly speaking with the outermost peak of the vibrational wavefunctions as shown in Fig. 5.…”

Section: Photoassociation and Formation Of Ground State Moleculessupporting

confidence: 55%

Formation of ultracold SrYb molecules in an optical lattice by photoassociation spectroscopy: theoretical prospects

Tomza

Pawłowski

Jeziorska

et al. 2011

Phys. Chem. Chem. Phys.

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State-of-the-art ab initio techniques have been applied to compute the potential energy curves for the SrYb molecule in the Born-Oppenheimer approximation for the ground state and first fifteen excited singlet and triplet states. All the excited state potential energy curves were computed using the equation of motion approach within the coupled-cluster singles and doubles framework and large basis-sets, while the ground state potential was computed using the coupled cluster method with single, double, and noniterative triple excitations. The leading long-range coefficients describing the dispersion interactions at large interatomic distances are also reported. The electric transition dipole moments have been obtained as the first residue of the polarization propagator computed with the linear response coupled-cluster method restricted to single and double excitations. Spin-orbit coupling matrix elements have been evaluated using the multireference configuration interaction method restricted to single and double excitations with a large active space. The electronic structure data was employed to investigate the possibility of forming deeply bound ultracold SrYb molecules in an optical lattice in a photoassociation experiment using continuous-wave lasers. Photoassociation near the intercombination line transition of atomic strontium into the vibrational levels of the strongly spin-orbit mixed b 3 Σ + , a 3 Π, A 1 Π, and C 1 Π states with subsequent efficient stabilization into the v ′′ = 1 vibrational level of the electronic ground state is proposed. Ground state SrYb molecules can be accumulated by making use of collisional decay from v ′′ = 1 to v ′′ = 0. Alternatively, photoassociation and stabilization to v ′′ = 0 can proceed via stimulated Raman adiabatic passage provided that the trapping frequency of the optical lattice is large enough and phase coherence between the pulses can be maintained over at least tens of microseconds.

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Section: Photoassociation and Formation Of Ground State Moleculessupporting

confidence: 55%

Formation of ultracold SrYb molecules in an optical lattice by photoassociation spectroscopy: theoretical prospects

Tomza

Pawłowski

Jeziorska

et al. 2011

Phys. Chem. Chem. Phys.

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“…Just as in the case of KRb [21,22], a similar STIRAP scheme is also used to produce rovibrational ground-state RbCs molecules with high phase-space density in Innsbruck [30,31] and Durham [32]. The methods of resonance coupling, either (1) 1 ∼ (2) 1 [33] or A 1 + ∼ b 3 [34], are explored to the formation of RbCs molecules in the lowest rovibrational ground state. Recently, Gabbanini et al [35] observed metastable triplet ground-state RbCs molecules produced by photoassociation followed by radiative stabilization.…”

Section: Introductionmentioning

confidence: 99%

Photoassociative formation of ultracold RbCs molecules in the(2)3Πstate

Zhang

et al. 2012

Phys. Rev. A

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We have investigated photoassociative formation of RbCs molecules in the (2) 3 excited state correlated to v = 8, (5)0 + vibrational level in detail. The metastable ground-state RbCs molecules formed by spontaneous decay are ionized by pulsed dye laser through resonance-enhanced two-photon ionization. A rate equation of the photoionization process is introduced to explain the dependence of RbCs + molecular ion intensity on the ionization laser intensity. The saturation effect of molecular ion intensity appears as the photoassociation laser intensity increases. The rotational constant and centrifugal distortion constant are derived to be 0.01304 cm −1 and 0.000015 cm −1 from the photoassociation spectrum with a high sensitivity, respectively. The measured electric dipole moment of the observed (2) 3 state RbCs molecules is 4.7(6) D by Stark effect in static electric field.

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“…[15][16][17][18] Prospective studies of resonant coupling in cold heteronuclear alkali dimers also recently appeared. 19,20 Note that coupling between electronic states but with no direct interaction between energy levels is invoked for the formation of ultracold RbCs 21 and KRb 10 ground states molecules.…”

Section: Introductionmentioning

confidence: 99%

Deeply bound cold caesium molecules formed after 0−g resonant coupling

Lignier

Fioretti

Horchani

et al. 2011

Phys. Chem. Chem. Phys.

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Translationally cold caesium molecules are created by photoassociation below the 6s + 6p(1/2) excited state and selectively detected by resonance enhanced two photon ionization (RE2PI). A series of excited vibrational levels belonging to the 0(-)(g) symmetry is identified. The regular progression of the vibrational spacings and of the rotational constants of the 0(-)(g) (6s + 6p(1/2)) levels is strongly altered in two energy domains. These deviations are interpreted in terms of resonant coupling with deeply bound energy levels of two upper 0(-)(g) states dissociating into the 6s + 6p(3/2) and 6s + 5d(3/2) asymptotes. A theoretical model is proposed to explain the coupling and a quantum defect analysis of the perturbed level position is performed. Moreover, the resonant coupling changes dramatically the spontaneous decay products of the photoexcited molecules, strongly enhancing the decay into deeply bound levels of the a(3)Σ(+)(u) triplet state and of the X(1)Σ(+)(g) ground state. These results may be relevant when conceiving population transferring schemes in cold molecule systems.

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Resonant coupling effects on the photoassociation of ultracold Rb and Cs atoms

Cited by 15 publications

References 73 publications

Formation of ultracold SrYb molecules in an optical lattice by photoassociation spectroscopy: theoretical prospects

Formation of ultracold SrYb molecules in an optical lattice by photoassociation spectroscopy: theoretical prospects

Photoassociative formation of ultracold RbCs molecules in the(2)3Πstate

Deeply bound cold caesium molecules formed after 0−g resonant coupling

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