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The prospects of sympathetic cooling of NH molecules with Li atoms

Wallis, Alisdair O.G.; Longdon, Edward J.J.; Zuchowski, Piotr S.; Hutson, Jeremy M.


Alisdair O.G. Wallis

Edward J.J. Longdon

Piotr S. Zuchowski


We calculate the quartet potential energy surface for Li+NH and use it to calculate elastic and spin-relaxation cross sections for collisions in magnetically trappable spin-stretched states. The potential is strongly anisotropic but spin-relaxation collisions are still suppressed by centrifugal barriers when both species are in spin-stretched states. In the ultracold regime, both the elastic and inelastic cross sections fluctuate dramatically as the potential is varied because of Feshbach resonances. The potential-dependence is considerably reduced at higher energies. The major effect of using an unconverged basis set in the scattering calculations is to shift the resonances without changing their general behaviour. We have calculated the ratio of elastic and spin-relaxation cross sections, as a function of collision energy and magnetic field, for a variety of potential energy surfaces. Most of the surfaces produce ratios that are favorable for sympathetic cooling, at temperatures below about 20 mK.


Wallis, A. O., Longdon, E. J., Zuchowski, P. S., & Hutson, J. M. (2011). The prospects of sympathetic cooling of NH molecules with Li atoms. The European Physical Journal D, 65(1-2), 151-160.

Journal Article Type Article
Publication Date Nov 1, 2011
Deposit Date Jun 19, 2013
Journal European Physical Journal D
Print ISSN 1434-6060
Electronic ISSN 1434-6079
Publisher Springer
Peer Reviewed Peer Reviewed
Volume 65
Issue 1-2
Pages 151-160