Molecule-molecule and atom-molecule collisions with ultracold RbCs molecules
| Autor: | Luke M. Fernley, Jacob A. Blackmore, Sarah L. Bromley, Simon L. Cornish, Matthew D. Frye, Jeremy M. Hutson, Philip D. Gregory |
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| Rok vydání: | 2021 |
| Předmět: |
Physics
Condensed Matter::Quantum Gases Atomic Physics (physics.atom-ph) Inelastic collision FOS: Physical sciences General Physics and Astronomy 01 natural sciences Molecular physics Physics - Atomic Physics 010305 fluids & plasmas Quantum Gases (cond-mat.quant-gas) 0103 physical sciences Atom Molecule Physics::Atomic Physics Physics::Chemical Physics Condensed Matter - Quantum Gases 010306 general physics Ground state Hyperfine structure Excitation |
| Zdroj: | New Journal of Physics New Journal of Physics, 2021, Vol.23, pp.125004 [Peer Reviewed Journal] |
| ISSN: | 1367-2630 |
| DOI: | 10.1088/1367-2630/ac3c63 |
| Popis: | 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. Comment: 21 pages, 9 figures |
| Databáze: | OpenAIRE |
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