Cold and ultracold NH--NH collisions in magnetic fields

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 ${}^{15}$NH 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.

Submitted to Phys. Rev. A

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• Atom-molecule collisions, spin relaxation, and sympathetic cooling in an ultracold spin-polarized Rb(${}^2\mathrm{S}$)-SrF${(}^2{\Sigma }^{+})$ mixture
• Efficient method for quantum calculations of molecule - molecule scattering properties in a magnetic field
• The effect of hyperfine interactions on ultracold molecular collisions: NH(^3Sigma^-) with Mg(^1S) in magnetic fields
• Cold and ultracold NH--NH collisions: The field-free case
• Universal probability distributions of scattering observables in ultracold molecular collisions
• Molecular Collisions: from Near-cold to Ultra-cold
• Ultracold $O_2$+$O_2$ collisions in a magnetic field: on the role of the potential energy surface
• Ultracold molecular collisions in combined electric and magnetic fields
• Multistage Zeeman deceleration of NH $X{}^3{\Sigma }^{-}$ radicals
• On the role of the magnetic dipolar interaction in cold and ultracold collisions: Numerical and analytical results for NH(${}^3{\Sigma }^{-}$) + NH(${}^3{\Sigma }^{-}$)
• Total angular momentum representation for atom-molecule collisions in electric fields
• Sympathetic cooling of fluorine atoms with ultracold atomic hydrogen
• Elastic and inelastic collisions of ${}^2\Sigma$ molecules in a magnetic field
• Cold collisions of an open-shell S-state atom with a ^2Pi molecule: N(^4S) colliding with OH in a magnetic field
• Magnetic Feshbach resonances in collisions of non-magnetic closed-shell ${}^1\Sigma$ molecules
• Multichannel Quantum Defect Theory for cold molecular collisions with a strongly anisotropic potential energy surface