Heidelberg 2015 – wissenschaftliches Programm

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SYPS: Promovierendensymposium: Controlled Diatomic Molecules in the Ultracold Regime

SYPS 1: Controlled Diatomic Molecules in the Ultracold Regime

SYPS 1.1: Hauptvortrag

Dienstag, 24. März 2015, 17:00–17:30, K/HS1

Feshbach resonances and the production of ultracold molecules — •Jeremy M. Hutson — Durham University, UK

This tutorial talk with give an overview of the routes available for producing samples of cold and ultracold molecules. It will briefly cover direct methods that cool samples of warm molecules to low temperatures. Example of such methods include buffer-gas cooling, beam deceleration, velocity selection, electrostatic Sisyphus cooling and laser cooling. However, the talk will focus on indirect methods that form ultracold molecules from ultracold atoms. It will describe the origins of the near-threshold energy levels of alkali-metal diatomics, which are responsible for zero-energy Feshbach resonances at magnetic fields where they cross threshold. Such resonances can be used to produce ultracold molecules by magnetoassociation. This has been achieved for a wide variety of alkali dimers in highly excited vibrational states, and a few of these have been transferred to the absolute ground state by STIRAP (Cs2, KRb, RbCs). There are prospects for extending magnetoassociation to other species, such as molecules containing Group II atoms such as Sr and Yb.