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MO: Fachverband Molekülphysik

MO 19: MO Poster 4

MO 19.19: Poster

Donnerstag, 12. März 2020, 17:00–19:00, Empore Lichthof

Improving and understanding a cryogenic buffer-gas cell based on comparing Monte-Carlo simulations and experiments — •Florian Jung, Thomas Gantner, Manuel Koller, Jindaratsamee Phrompao, Isabel Rabey, Martin Zeppenfeld, and Gerhard Rempe — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Straße 1, 85748 Garching bei München

Unlike atoms, molecules can exhibit a permanent electric dipole moment, which makes them amenable to guiding and trapping via electric fields and allows the study of anisotropic dipolar interactions. In addition, they exhibit a rich internal structure that allows to envision applications of molecules in such diverse fields as cold chemistry, quantum information science and quantum simulation. For all of these applications the prerequisite is that molecules are cold. To produce cold molecules at a temperature of a few Kelvin, buffer-gas cells are now established workhorses, cooling molecules via thermalisation with cold atomic gases independent of the molecule type. However, many aspects of the physics of buffer-gas cells are still to be understood.

We here present a comprehensive study of buffer-gas cells in the low-density regime, employing Monte-Carlo simulations and comparing these to experimental data, finding a good agreement between the simulated and measured data. We formulate design guidelines that we employ in our set-up, reaching a signal increase of at least a factor of 2. Combining the cryogenic buffer-gas source with a centrifuge decelerator and an electrostatic trap, collision studies on cold molecular ensembles are now within reach.