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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

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Published on: March 30, 2017

Interactions and dynamics in Li+Li2 ultracold collisions.

Marko T Cvitas¹, Pavel Soldán, Jeremy M Hutson

¹Department of Chemistry, University of Durham, South Road, Durham DH1 3LE, United Kingdom.

The Journal of Chemical Physics

|August 28, 2007

Summary

Spin-polarized lithium atom-molecule collisions were studied using a new potential energy surface. Inelastic collisions, crucial for molecule production, showed weak dependence on surface details for excited states.

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Area of Science:

Atomic and Molecular Physics
Quantum Chemistry
Chemical Physics

Background:

Understanding ultracold atom-molecule collisions is vital for quantum technologies.
Lithium trimer ((4)A') electronic states influence collision dynamics.
Inelastic collisions contribute to trap loss in molecule production experiments.

Purpose of the Study:

Develop a potential energy surface for the lowest quartet electronic state of lithium trimer.
Investigate spin-polarized Li+Li(2) collisions at ultralow kinetic energies.
Analyze elastic and inelastic cross sections for various Li(2) rovibrational states.

Main Methods:

Development of a potential energy surface for the (4)A' state of Li3.
Calculation of elastic and inelastic cross sections for Li+Li(2) collisions.
Investigation of isotope effects and surface sensitivity.

Main Results:

The potential energy surface permits barrierless atom exchange reactions.
Calculated cross sections reveal the role of inelastic collisions in trap loss.
Cross sections for vibrationally excited states show weak dependence on potential energy surface details.

Conclusions:

The developed potential energy surface accurately describes Li+Li(2) collision dynamics.
Inelastic collisions are a significant loss mechanism in lithium molecule production.
The robustness of cross-section calculations to potential energy surface variations is demonstrated for excited states.