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MO: Fachverband Molekülphysik
MO 9: Poster 2
MO 9.4: Poster
Freitag, 24. September 2021, 17:30–19:30, P
A direct comparison of buffer gas molecular beams of AlF, CaF and MgF — •Maximilian Doppelbauer, Sidney Wright, Xiangyue Liu, Simon Hofsäss, Jesús Pérez-Ríos, Gerard Meijer, and Stefan Truppe — Fritz Haber Institute of the Max Planck Society, Berlin, Germany
The production of dense, controlled samples is crucial for many applications of ultracold molecules. Cryogenic buffer gas sources are widely used for producing bright, slow beams of internally cold molecules. We aim to understand the formation process of the laser-coolable monofluorides AlF, CaF and MgF after laser ablation of a metal target and reaction with a fluorine donor gas. We combine theoretical calculations with a systematic experimental approach for this study.
We first examined the reaction rate for different reactants using molecular dynamics simulations. The electronic interaction energy was calculated on the fly using the BHLYP-D3 functional, and the def2-TZVP basis set. The calculations predict that AlF is produced more efficiently using NF3, than with SF6, and that the formation of AlF is one order of magnitude more efficient than that of CaF.
In the experiment, we measured the brightness of Al and Ca atomic beams and compared it to AlF, CaF and MgF molecular beams. We show that the AlF beam is one order of magnitude brighter than a CaF or MgF beam formed in the same buffer gas source, both in absorption and in fluorescence. The fact that the atomic beams of Al and Ca are similar in brightness supports the theoretical result. All atomic and molecular beams have similar forward velocity distributions.