Berlin 2014 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 32: Poster: Quantum gases, ultracold atoms and molecules

Q 32.24: Poster

Mittwoch, 19. März 2014, 16:30–18:30, Spree-Palais

An ultracold mixture of metastable triplet He and Rb atoms — •Adonis S. Flores, Hari P. Mishra, Wim Vassen, and Steven Knoop — LaserLaB, VU University, Amsterdam, The Netherlands

We are working on an experiment to produce an ultracold atomic mixture of metastable He (3He* or 4He*) and 87Rb. Our main goals are the observation of heteronuclear Efimov trimers and atom exchange reactions in collisions between atoms and Feshbach molecules. This requires the search for interspecies Feshbach resonances, needed to control the interaction between He* and Rb, and map out the near-threshold molecular He*Rb spectrum. Our strategy to obtain an ultracold He*+Rb mixture starts with a two-species MOT, loaded from a Zeeman slower (He*) and a 2D-MOT (Rb). Afterwards the mixture is loaded in a quadrupole magnetic trap (QMT) and a 1557-nm optical dipole trap for forced evaporative cooling. We have realized an ultracold mixture of 4He* and 87Rb in the QMT, for which Rb is prepared in the F=2, mF=2 state, in order to suppress interspecies Penning ionization. Here we will discuss the status of the setup and the latest experimental data, in particular thermalization measurements from which the interspecies scattering length can be inferred.

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DPG-Physik > DPG-Verhandlungen > 2014 > Berlin