Published in
American Physical Society, Physical Review A, 2(83), 2011
DOI: 10.1103/physreva.83.022713
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Cold and ultracold nh-nh collisions in magnetic fields
,
Piotr S. Żuchowski,
Ad van der Avoird,
P. S. Zuchowski,
A. van der Avoird,
Gerrit C. Groenenboom ,
Jeremy M. Hutson
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Abstract
Elastic and spin-changing inelastic collision cross sections are presented for cold and ultracold magnetically trapped NH. The cross sections are obtained from coupled-channel scattering calculations as a function of energy and magnetic field. We specifically investigate the influence of the intramolecular spin-spin, spin-rotation, and intermolecular magnetic dipole coupling on the collision dynamics. It is shown that 15NH is a very suitable candidate for evaporative cooling experiments. The dominant trap-loss mechanism in the ultracold regime originates from the intermolecular dipolar coupling term. At higher energies and fields, intramolecular spin-spin coupling becomes increasingly important. Our qualitative results and conclusions are fairly independent of the exact form of the potential and of the size of the channel basis set.