Ultracold collision properties of metastable alkaline-earth atoms

Abstract

Ultra-cold collisions of spin-polarized 24Mg,40Ca, and 88Sr in the metastable 3P2 excited state are investigated. We calculate the long-range interaction potentials and estimate the scattering length and the collisional loss rate as a function of magnetic field. The estimates are based on molecular potentials between 3P2 alkaline-earth atoms obtained from ab initio atomic and molecular structure calculations. The scattering lengths show resonance behavior due to the appearance of a molecular bound state in a purely long-range interaction potential and are positive for magnetic fields below 50 mT. A loss-rate model shows that losses should be smallest near zero magnetic field and for fields slightly larger than the resonance field, where the scattering length is also positive.

arXiv comment4 pages, 4 figures

References in corpus (11)

• Inter-isotope determination of ultracold rubidium interactions from three high-precision experiments
• Bose-Einstein Condensation of Metastable Helium
• Linking Ultracold Polar Molecules
• Magnetic trapping of metastable ${}^3{P}_2$ atomic strontium
• High-accuracy relativistic many-body calculations of van der Waals coefficients C_6 for alkaline-earth atoms
• High-precision calculations of electric-dipole amplitudes for transitions between low-lying levels of Mg, Ca, and Sr
• On the feasibility of cooling and trapping metastable alkaline-earth atoms
• Calculations of collisions between cold alkaline earth atoms in a weak laser field
• Probing dipolar effects with condensate shape oscillation
• Limit on suppression of ionization in metastable neon traps due to long-range anisotropy
• Long-range interaction of two metastable rare-gas atoms

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