Photoassociation of heteronuclear lithium

Schlöder, U.; Silber, C.; Zimmermann, C.

doi:10.1007/s003400100746

Cited by 34 publications

(42 citation statements)

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“…Since these pioneer works all the alkali atoms (Li, Na, K, Rb and Cs) (for a review see [23,24]) then hydrogen [25], metastable helium [26], calcium [27] and ytterbium [28] have been photoassociated. Preliminary results for heteronuclear alkali systems have also been reported [29,30].…”

Section: Introductionmentioning

confidence: 88%

Improved LeRoy–Bernstein near-dissociation expansion formula, and prospect for photoassociation spectroscopy

Comparat

2004

The Journal of Chemical Physics

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NDE (Near-dissociation expansion) including LeRoy-Bernstein formulas are improved by taking into account the multipole expansion coefficients and the non asymptotic part of the potential curve. Applying these new simple analytical formulas to photoassociation spectra of cold alkali atoms, we improve the determination of the asymptotic coefficient, reaching a 1% accuracy, for long-range relativistic potential curve of diatomic molecules.

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Section: Introductionmentioning

confidence: 88%

Improved LeRoy–Bernstein near-dissociation expansion formula, and prospect for photoassociation spectroscopy

Comparat

2004

The Journal of Chemical Physics

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“…In practice, before each scattering calculation we transform the Hamiltonian matrix from this basis into the field-dressed basis defined by (7). We solve the coupled-channel equations using a logarithmic derivative propagator method [22] to determine scattering matrices.…”

Section: Oh-oh Interactionmentioning

confidence: 99%

Collisional dynamics of ultracold OH molecules in an electrostatic field

2002

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Ultracold collisions of polar OH molecules are considered in the presence of an electrostatic field. The field exerts a strong influence on both elastic and state-changing inelastic collision rate constants, leading to clear experimental signatures that should help disentangle the theory of cold molecule collisions.Based on the collision rates we discuss the prospects for evaporative cooling of electrostatically trapped OH. We also find that the scattering properties at ultralow temperatures prove to be remarkably independent of the details of the short-range interaction, owing to avoided crossings in the long-range adiabatic potential curves. The behavior of the scattering rate constants is qualitatively understood in terms of a novel set of long-range states of the [OH] 2 dimer.

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“…Indeed, the presence of |2, 1 or |1, −1 atoms leads to large inelastic Li losses at high densities, and their removal from the trap is a precondition to achieve Fermi degeneracy. Furthermore, we measure the interspecies thermalization speed and derive a value for the scattering length for heteronuclear collisions.The scheme of our experiment is as follows: We simultaneously load 87 Rb atoms from a dispenser and 6 Li atoms from a Zeeman slower [13] into superposed standard magneto-optical traps (MOT). From here the atoms are transferred into a magnetic quadrupole potential operated with the same coils as the MOT.…”

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confidence: 99%

“…As an alternative to Feshbach resonances, photoassociation is used to transform atomic pairs into molecules. Photoassociation has been extensively investigated for the homonuclear case [12], and there are already examples of successful heteronuclear photoassociation [13,14,15]. The advantage of photoassociation is the possibility to form molecules also in deeper lying bound states [16], where the internuclear distance is drastically reduced and the molecules behave more like composite particles with a well defined quantum statistics.…”

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Quantum-Degenerate Mixture of Fermionic Lithium and Bosonic Rubidium Gases

et al. 2005

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We report on the observation of sympathetic cooling of a cloud of fermionic 6 Li atoms which are thermally coupled to evaporatively cooled bosonic 87 Rb. Using this technique we obtain a mixture of quantum-degenerate gases, where the Rb cloud is colder than the critical temperature for BoseEinstein condensation and the Li cloud colder than the Fermi temperature. From measurements of the thermalization velocity we estimate the interspecies s-wave triplet scattering length |as| = 20 +9 −6 aB. We found that the presence of residual rubidium atoms in the |2, 1 and the |1, −1 Zeeman substates gives rise to important losses due to inelastic collisions.PACS numbers: 05.30. Fk, 05.30.Jp, 32.80.Pj, The recent realization of degenerate gases of homonuclear diatomic molecules is an important achievement for the physics of ultracold dilute quantum gases [1,2]. The key to this spectacular success was the use of Feshbach resonances which allow for an adiabatic transformation from free pairs to molecules in the least bound state close to the dissociation energy [3]. The large internal energy makes the gas unstable against collisions between the molecules, which transform the energy into kinetic energy of the collision partners [4]. The very long lifetimes of up to several 10 s observed for dimers made of fermionic 6 Li [2] are explained by the fact that the atoms are only loosely bound with a binding energy of 1 µK such that they still behave very much like individual atoms [5]. Collisions are thus suppressed due to Pauli-blocking. Fermionic lithium is now a very promising candidate for exploring the cross-over regime between the Bardeen-Cooper-Schrieffer (BCS) model for superconductivity based on Cooper pairs and the regime of a Bose-Einstein condensate of composite bosons [6].In contrast to homonuclear dimers molecules made of two different atomic species exhibit a permanent electric dipole moment. The LiRb dimer has a very large permanent electric dipole moment of up to 4.2 Debye [7]. The intermolecular interaction in such a heteronuclear gas has a pronounced long-range character, which fundamentally alters its behavior at low temperatures [8] and brings global properties of the gas into play. The geometric shape of the cloud for instance will influence the total interaction energy and thus the stability of the gas [9].A possible approach to generate a polar molecular gas would use a Feshbach resonance in close analogy to the homonuclear experiments [1,2]. Only recently first heteronuclear Feshbach resonances have been observed [10]. Weakly bound heteronuclear molecules are expected to be relatively stable against collisions if one of the two atoms is a fermion [5]. For such molecules Pauli-blocking is at least partially effective, even though reactive collisions may reduce their lifetime [11]. As an alternative to Feshbach resonances, photoassociation is used to transform atomic pairs into molecules. Photoassociation has been extensively investigated for the homonuclear case [12], and there are already examples of successf...

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Photoassociation of heteronuclear lithium

Cited by 34 publications

References 0 publications

Improved LeRoy–Bernstein near-dissociation expansion formula, and prospect for photoassociation spectroscopy

Improved LeRoy–Bernstein near-dissociation expansion formula, and prospect for photoassociation spectroscopy

Collisional dynamics of ultracold OH molecules in an electrostatic field

Quantum-Degenerate Mixture of Fermionic Lithium and Bosonic Rubidium Gases

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