Cold atom-molecule photoassociation: long-range interactions beyond the 1/Rn expansion
Laboratoire Aimé Cotton, CNRS, Bât. 505, Univ. Paris-Sud, 91405
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Received in final form: 28 February 2011
Published online: 17 May 2011
We investigate theoretically the combination of first-order quadrupole-quadrupole and second-order dipole-dipole effects on the long-range electrostatic interactions between a ground-state homonuclear alkali-metal dimer and an excited alkali-metal atom. As the electrostatic energy is comparable to the dimer rotational structure, we develop a general description of the long-range interactions in the framework of the second-order degenerate perturbation theory, which allows for couplings between the dimer rotational levels. The resulting adiabatic potential energy curves exhibit avoided crossings, and cannot be expanded as the usual 1/Rn series. We study in details the particular case Cs2+Cs(62P). Our results are found promising to achieve photoassociation of ultracold trimers.
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag 2011