Cold collisions of N atoms and NH molecules in magnetic fields

Details Cold collisions of N atoms and NH molecules in magnetic fields Cold collisions of N atoms and NH molecules in magnetic fields

2010-09-07

arxiv.org/abs/1009.1322v1

Phys. Chem. Chem. Phys. 13, 3669-3680 (2011)

Physics

Chemical Physics

12 figures, 33 pages, RSC format

Scientific paper

10.1039/C0CP01447H

We calculate the interaction potential between N atoms and NH molecules and use it to investigate cold and ultracold collisions important for sympathetic cooling. The ratio of elastic to inelastic cross sections is large over a wide range of collision energy and magnetic field for most isotopic combinations, so that sympathetic cooling of NH molecules by N atoms is a good prospect. However, there are important effects due to a p-wave shape resonance that may inhibit cooling in some cases. We show that scaling the reduced mass used in the collision is approximately equivalent to scaling the interaction potential. We then explore the dependence of the scattering properties on the reduced mass and explain the resonant effects observed using angular-momentum-insensitive quantum defect theory

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