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CANCELLED CANCELED Quantum-state-resolved chemistry and physics with ultracold molecules
April 7, 2020 @ 4:00 pm - 5:00 pm
Tanya Zelevinsky, Department of Physics, Columbia University
The control of quantum states of matter is no longer limited to atoms. It is now accessible to an increasing range of molecules, leading into studies of chemical processes in the quantum-mechanical regime. In this talk, we will discuss experiments where laser-cooled atoms are bound into molecular dimers and subsequently photodissociated with full quantum state control. The emerging angular distributions of the photofragments clearly show nonclassical effects such as matter-wave interference, reaction barrier tunneling, and shape resonances. The outcome of these basic photodissociation reactions can be altered via application of weak magnetic fields. We also track the evolution of the angular distributions with the photofragment energy, and observe a crossover from the ultracold to the quasiclassical regime. Furthermore, ultracold molecular gases can be created via direct laser cooling of molecules. We show the progress of laser cooling diatomic hydrides, and preview the advances in fundamental science that are enabled by molecular cooling and quantum state control.