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Q: Fachverband Quantenoptik und Photonik
Q 61: SYCM: Contributed talks for the Symposium Hot topics in cold molecules: From laser cooling to quantum resonances
Q 61.2: Vortrag
Freitag, 13. März 2020, 14:15–14:30, e415
Towards sympathetic cooling of the ultracold SrF molecule — •Maciej Kosicki1, Masato Morita2, Piotr Zuchowski1, and Timur Tscherbul2 — 1Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University in Toruń, Poland, 87-100 — 2Department of Physics, University of Nevada, Reno, NV, 89557, USA
Sympathetic cooling is a method that can allow transferring molecules into a single partial-wave regime. This process is based on cooling species by immersion in a gas of coolant atoms. The method relies on elastic collisions to transfer momentum between the hot molecules and the coolant atoms. Inelastic collisions are detrimental to the cooling process as they release the internal energy of trapped molecules, leading to undesirable heating and trap loss. In addition, the inelastic collisions might also lead to final states that are no longer trappable. By providing numerical results, we show that the ultracold SrF molecule (recently laser-cooled into the microkelvin regime) is a promising candidate to be sympathetically cooled by collisions with Rb atom in the presence of a magnetic field. A key step into this direction has been an evaluation of the ratio between elastic and inelastic collisions for the spin-polarized SrF and Rb complex. In particular, the state-of-the-art ab initio calculations have been employed to obtain molecular properties and the potential energy surface in the lowest triplet state. Next, the scattering parameters have been obtained using the converged close-coupling calculations based on the total angular momentum representation in the body-fixed coordinate frame.