The prospects for producing ultracold NH${}_3$ molecules by sympathetic cooling: a survey of interaction potentials

Abstract

We investigate the possibility of producing ultracold NH3 molecules by sympathetic cooling in a bath of ultracold atoms. We consider the interactions of NH3 with alkali-metal and alkaline-earth atoms, and with Xe, using ab initio coupled-cluster calculations. For Rb-NH3 and Xe-NH3 we develop full potential energy surfaces, while for the other systems we characterize the stationary points (global and local minima and saddle points). We also calculate isotropic and anisotropic Van der Waals C6 coefficients for all the systems. The potential energy surfaces for interaction of NH3 with alkali-metal and alkaline-earth atoms all show deep potential wells and strong anisotropies. The well depths vary from 887 1/cm for Mg-NH3 to 5104 1/cm for Li-NH3. This suggests that all these systems will exhibit strong inelasticity whenever inelastic collisions are energetically allowed and that sympathetic cooling will work only when both the atoms and the molecules are already in their lowest internal states. Xe-NH3 is more weakly bound and less anisotropic.

10 pages, 7 figures

References in corpus (9)

• Production of cold molecules via magnetically tunable Feshbach resonances
• Feshbach resonances in rubidium 87: Precision measurement and analysis
• Molecule formation in ultracold atomic gases
• Ultracold Rb-OH collisions and prospects for sympathetic cooling
• Molecular collisions in ultracold atomic gases
• Alternating Gradient Focusing and Deceleration of Polar Molecules
• Ultracold atom-molecule collisions and bound states in magnetic fields: tuning zero-energy Feshbach resonances in He-NH (3Sigma-)
• Cold collisions of OH and Rb. I: the free collision
• Spectroscopy of the a^3Σ_u^+ state and the coupling to the X^1Σ_g^+ state of K_2

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