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Estimates for the lifetime of collision complexes formed during ultracoldmolecular collisions based on density-of-states arguments are shown to beconsistent with similar estimate based on classical trajectory calculations. Inthe classical version, these collisions are shown to exhibit chaos, and theirfractal dimensions are calculated versus collision energy. From these results,a picture emerges that ultracold collisions are classically ergodic, justifyingthe density-of-states estimates for lifetimes. These results point the waytoward using the techniques of classical and quantum chaos to interpretmolecular collisions in the ultracold regime.

Long-Lived Complexes, Ergodicity and Chaos in Ultracold Molecular Collisions