Quasi-Universal Dipolar Scattering in Cold and Ultracold Gases

Details Quasi-Universal Dipolar Scattering in Cold and Ultracold Gases Quasi-Universal Dipolar Scattering in Cold and Ultracold Gases

2009-01-09

arxiv.org/abs/0901.1281v1

Physics

Atomic Physics

19 pages, 5 figures

Scientific paper

We investigate the scattering cross section of aligned dipolar molecules in low-temperature gases. Over a wide range of collision energies relevant to contemporary experiments, the cross section declines in inverse proportion to the collision speed, and is given nearly exactly by a simple semiclassical formula. At yet lower energies, the cross section becomes independent of energy, and is reproduced within the Born approximation to within corrections due to the s-wave scattering length. While these behaviors are universal for all polar molecules, nevertheless interesting deviations from universality are expected to occur in the intermediate energy range.

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