Complexes formed in collisions between ultracold alkali-metal diatomic molecules and atoms

Frye, Matthew D.; Hutson, Jeremy M.

doi:10.48550/arxiv.2109.07435

Cited by 1 publication

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References 90 publications

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“…It is possible that the dominant loss process for atom + molecule collisions is the same fast optical excitation of two-body collision complexes that we have observed for molecule + molecule collisions [60,72]. In the RRKM limit, the laser-free lifetime of the RbCs + Cs collision complex in the dark is expected to be a factor of 2 × 10 4 shorter [69,95] than the lifetime of ∼ 0.5 ms for the (RbCs) 2 complex. If the lifetime of the atom-molecule complex is so short, we may expect that there is not enough time for significant laser excitation before the complex dissociates, or that at least this process may not be saturated.…”

Section: Rbcs + Cs In An Intensity-modulated Trapmentioning

confidence: 57%

Molecule-molecule and atom-molecule collisions with ultracold RbCs molecules

Gregory,

Blackmore,

Frye

et al. 2021

Preprint

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Understanding ultracold collisions involving molecules is of fundamental importance for current experiments, where inelastic collisions typically limit the lifetime of molecular ensembles in optical traps. Here we present a broad study of optically trapped ultracold RbCs molecules in collisions with one another, in reactive collisions with Rb atoms, and in nonreactive collisions with Cs atoms. For experiments with RbCs alone, we show that by modulating the intensity of the optical trap, such that the molecules spend 75% of each modulation cycle in the dark, we partially suppress collisional loss of the molecules. This is evidence for optical excitation of molecule pairs mediated via sticky collisions. We find that the suppression is less effective for molecules not prepared in the spin-stretched hyperfine ground state. This may be due either to longer lifetimes for complexes or to laser-free decay pathways. For atom-molecule mixtures, RbCs+Rb and RbCs+Cs, we demonstrate that the rate of collisional loss of molecules scales linearly with the density of atoms. This indicates that, in both cases, the loss of molecules is rate-limited by two-body atom-molecule processes. For both mixtures, we measure loss rates that are below the thermally averaged universal limit.

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