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We investigate the lifetimes of complexes formed in ultracold moleculecollisions. Employing both transition-state-theory and an optical modelapproach we examine processes that can extend the lifetime of complexes beyondthat predicted by Rice-Ramsperger-Kassel-Marcus theory. We focus on complexesthat possess only one open channel, and find that the extreme distribution ofwidths for this case favors low decay rates. Thus decay from a complex into asingle energetically available channel can be anomalously slow, and moreovernonexponential in time. We apply the theory to two systems of currentexperimental interest, RbCs and NaRb, finding qualitatively that the empiricaltime scales can be accounted for in the theory.

Anomalous Lifetimes of Ultracold Complexes Decaying into a Single Channel: What's Taking So Long in There?