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Are ultracold molecular collisions sticky? [dataset] Open Access

Understanding and controlling collisions is crucial to the burgeoning field of ultracold molecules. All experiments so far have observed fast loss of molecules from the trap. However, the dominant mechanism for collisional loss is not well understood when there are no allowed 2-body loss processes. Here we experimentally investigate collisional losses of nonreactive ultracold RbCs molecules, and compare our findings with the sticky collision hypothesis that pairs of molecules form long-lived collision complexes. We demonstrate that loss of molecules occupying their rotational and hyperfine ground state is best described by second-order rate equations, consistent with the expectation for complex-mediated collisions, but that the rate is lower than the limit of universal loss. The loss is insensitive to magnetic field but increases for excited rotational states. We demonstrate that dipolar effects lead to significantly faster loss for an incoherent mixture of rotational states.

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Resource type

Dataset

Contributors

Creator: Gregory, Philip David ¹
Creator: Frye, Matthew ¹

¹ Durham University, UK

Funder

Engineering and Physical Sciences Research Council

Research methods

Other description

Keyword

ultracold
molecular
collisions
sticky collisions
polar molecules
RbCs

Subject

Location

Language

Cited in

arxiv:1904.00654v2

Identifier

ark:/32150/r270795768f
doi:10.15128/r270795768f

Rights

Creative Commons Attribution 4.0 International (CC BY)

Publisher

Durham University

Date Created

File Details

Depositor

P.D. Gregory

Date Uploaded

23 May 2019, 16:05:19

Date Modified

24 February 2020, 16:02:14

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File format: zip (ZIP Format)

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File size: 14506894

Last modified: 2019:05:23 17:37:56+01:00

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Original checksum: 393c0623acd1c6e881a63b4135973f65