Long-range interactions between ultracold atoms and molecules including atomic spin-orbit

Details Long-range interactions between ultracold atoms and molecules including atomic spin-orbit Long-range interactions between ultracold atoms and molecules including atomic spin-orbit

2011-06-10

arxiv.org/abs/1106.2051v1

Physics

Chemical Physics

Submitted to Phys. Chem. Chem. Phys., special issue on cold molecules

Scientific paper

We investigate theoretically the long-range electrostatic interactions between a ground-state homonuclear alkali-metal dimer and an excited alkali-metal atom taking into account its fine-structure. The interaction involves the combination of first-order quadrupole-quadrupole and second-order dipole-dipole effects. Depending on the considered species, the atomic spin-orbit may be comparable to the atom-molecule electrostatic energy and to the dimer rotational structure. Here we extend our general description in the framework of the second-order degenerate perturbation theory [M. Lepers and O. Dulieu, Eur. Phys. J. D, 2011] to various regimes induced by the magnitude of the atomic spin-orbit. A complex dynamics of the atom-molecule may take place at large distances, which may have consequences for the search for an universal model of ultracold inelastic collisions as proposed for instance in [Z. Idziaszek and P. S. Julienne, Phys. Rev. Lett. \textbf{104}, 113202 (2010)].

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