Dresden 2011 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 26: Poster III
A 26.76: Poster
Donnerstag, 17. März 2011, 16:00–18:30, P2
Theory of photoassociation of ultracold trimers: long-range interactions — Maxence Lepers1, Romain Vexiau1, Nadia Bouloufa1, Viatcheslav Kokoouline2,1, and •Olivier Dulieu1 — 1Laboratoire Aimé Cotton, CNRS/Université Paris-Sud, Orsay, France — 2Department of Physics, University of Central Florida, Orlando, Fl, USA
The electrostatic interaction between an excited atom and a diatomic ground state molecule in an arbitrary rovibrational level at large mutual separations is investigated with a general second-order perturbation theory, in the perspective of modeling the photoassociation between cold atoms and molecules. We find that the combination of quadrupole-quadrupole and van der Waals interactions compete with the rotational energy of the dimer, limiting the range of validity of the perturbative approach to distances larger than 100 a.u.. Numerical results are given for the long-range interaction between Cs and Cs2, showing that the photoassociation is probably efficient whatever the Cs2 rotational energy.