Darmstadt 2008 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 10: Kalte Moleküle I [gemeinsam mit MO]
Q 10.2: Vortrag
Dienstag, 11. März 2008, 09:00–09:15, 3G
Cryogenic buffer-gas cooling and magnetic trapping of CrH and MnH molecules — •Michael Stoll1, Joost Bakker2, Gerard Meijer1, and Achim Peters3 — 1Fritz-Haber-Institut der Max-Planck-Gesellschaft , Berlin — 2FOM Institute for Plasma Physics, Rijnhuizen, the Netherlands — 3Humboldt Universität zu Berlin, Institut für Physik
Buffer gas loading of molecules into a cryogenic He-filled cell and magnetic trapping of the thermalized molecules has been proven to be a powerful method for the production of samples of trapped cold molecules.
We report on the successful cooling of MnH and CrH molecules to sub-Kelvin temperatures using a He dilution refrigerator. Subsequently the molecules were loaded into a trapping field generated by a superconducting quadrupole magnet. Storage times of ~120 ms could be demonstrated for both molecules.
We modeled the dynamics of our system using a Monte Carlo approach in order to investigate different possible inelastic scattering processes responsible for limitations to the trapping time. Collision cross sections were obtained by fitting this model to the measured diffusion times of both molecules. Combining our system with the already demonstrated methods for rapid extraction of the buffer gas should in principle allow for the preparation of thermally isolated samples with then much longer lifetimes.