Maxence Lepers, Romain Vexiau, Mireille Aymar, Nadia Bouloufa-Maafa, Olivier Dulieu
We computed the long-range interactions between two identical polar bialkali molecules in their rovibronic ground level, for all ten species, using accurate quantum chemistry results combined with available spectroscopic data. Huge van der Waals interaction is found for eight species in the free space. The competition of the van der Waals interaction with the dipole-dipole interaction induced by an electric field parallel or perpendicular to the intermolecular axis is described as functions of the electric field magnitude and intermolecular distance. Our calculations predict a regime with a mutual orientation of the two molecules but with no preferential direction in the lab frame. A mechanism for the one-photon assisted association of a pair of ultracold polar molecules into ultracold tetramers is proposed, which would open the way towards the optical manipulation of ultracold polyatomic molecules.
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http://arxiv.org/abs/1305.5769
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