Photoassociation of a cold atom-molecule pair: long-range quadrupole-quadrupole interactions

Details Photoassociation of a cold atom-molecule pair: long-range quadrupole-quadrupole interactions Photoassociation of a cold atom-molecule pair: long-range quadrupole-quadrupole interactions

2010-06-28

arxiv.org/abs/1006.5314v2

Physics

Quantum Physics

5 figures

Scientific paper

The general formalism of the multipolar expansion of electrostatic interactions is applied to the calculation the potential energy between an excited atom (without fine structure) and a ground state diatomic molecule at large separations. Both partners exhibit a permanent quadrupole moment, so that their mutual quadrupole-quadrupole long-range interaction is attractive enough to bind trimers. Numerical results are given for an excited Cs(6P) atom and a ground state Cs2 molecule. The prospects for achieving photoassociation of a cold atom/dimer pair is thus discussed and found promising. The formalism can be easily generalized to the long-range interaction between molecules to investigate the formation of cold tetramers.

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