Ultracold collision properties of metastable alkaline-earth atoms

TitleUltracold collision properties of metastable alkaline-earth atoms
Publication TypeJournal Article
Year of Publication2003
AuthorsDerevianko, A, Porsev, SG, Kotochigova, S, Tiesinga, E, Julienne, PS
JournalPhysical Review Letters
Date Published2003/2/13

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

Short TitlePhys. Rev. Lett.