Rostock 2019 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 10: Posters 1: Cold Molecules, High Resolution Spectroscopy, and Theory

MO 10.9: Poster

Dienstag, 12. März 2019, 16:30–18:30, S Foyer LLM

Monte Carlo simulation of a cryogenic buffer gas cell — •Thomas Gantner, Manuel Koller, Martin Zeppenfeld, and Gerhard Rempe — Max-Planck-Institut für Quantenoptik, 85748 Garching, Deutschland

Cryogenic buffer gas cells have been a workhorse for the cooling of molecules for more than 20 years. The straightforward sympathetic cooling principle makes it applicable for a huge variety of different species. Notwithstanding this success, detailed simulations of buffer gas cells are rare, and limited to high buffer gas density regimes, when the mean free path of a molecule is small compared to all dimensions of the cell. Here, we present a new numerical approach based on a molecule trajectory analysis. The implementation following the Monte Carlo method can reproduce the flux of molecules emerging from the buffer gas cell for varying buffer gas densities. Furthermore, it can reproduce the velocity distribution of the resulting molecule beam. This includes the so-called boosting effect, when buffer gas atoms accelerate the molecules after leaving the cell. The simulations provide various insights which could substantially improve buffer-gas cell design.