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Shielding collisions of ultracold CaF molecules with static electric fields [dataset] Open Access

We study collisions of ultracold CaF molecules in strong static electric fields. Such fields allow the creation of long-range barriers in the interaction potential, which prevent the molecules reaching the short-range region where inelastic and other loss processes are likely to occur. We carry out coupled-channel calculations of rate coefficients for elastic scattering and loss. We develop an efficient procedure for including energetically well-separated rotor functions in the basis set via a Van Vleck transformation. We show that shielding is particularly efficient for CaF and allows the rate of 2-body loss processes to be reduced by a factor of 10^7 or more at a field of 23 kV/cm. The loss rates remain low over a substantial range of fields. Electron and nuclear spins cause strong additional loss in some small ranges of field, but have little effect elsewhere. The results pave the way for evaporative cooling of CaF towards quantum degeneracy.

Descriptions

Resource type

Dataset

Contributors

Creator: Mukherjee, Bijit ¹
Creator: Frye, Matthew D. ¹
Creator: Le Sueur, C. Ruth ¹
Creator: Tarbutt, Michael R. ²
Creator: Hutson, Jeremy M. ¹

¹ Durham University, UK
² Imperial College, UK

Funder

U.K. Engineering and Physical Sciences Research Council (EPSRC) Grant Nos. EP/P01058X/1
EP/W00299X/1
EP/V011499/1
EP/V011677/1

Research methods

Other description

Includes Fortran code and figure data files.

Keyword

Ultracold collisions between molecules
Dipole-dipole interactions
Stark effect

Subject

Location

Language

Cited in

Identifier

ark:/32150/r2x633f104f
doi:10.15128/r2x633f104f

Rights

Creative Commons Attribution 4.0 International (CC BY)

Publisher

Durham University

Date Created

File Details

Depositor

B. Mukherjee

Date Uploaded

27 June 2023, 19:06:13

Date Modified

28 June 2023, 10:06:15

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Characterization

File format: zip (ZIP Format)

Mime type: application/zip

File size: 597157

Last modified: 2023:06:27 20:27:21+01:00

Filename: Data_for_repository.zip

Original checksum: c0e2517edfa9c3b130c2349fa4f76dc4