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Hannover 2016 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 31: Ultra-cold atoms, ions and BEC I (with A)

Q 31.7: Talk

Wednesday, March 2, 2016, 12:30–12:45, f107

Molecular ion formation in atom-ion three body recombination — •Amir Mohammadi, Artjom Krükow, Joschka Wolf, Amir Mahdian, and Johannes Hecker Denschlag — Universität Ulm, Institut für Quantenmaterie, Albert-Einstein-Allee 45, D-89069 Ulm, Deutschland

Producing transitionally and internally cold molecular ions is one of the challenges and long standing goals in cold atom-ion experiments. One good strategy for this purpose is creating initially cold molecular ions by associating cold ions and cold atoms. In our hybrid atom-ion experiment, we investigate the interaction of a laser-cooled trapped 138Ba ion with an ultracold cloud of 87Rb atoms. At very low kinetic energies (i.e. sub-mK) and densities of 1012 cm−3, three-body atom-atom-ion recombination is the dominant reaction process in our experiment[1]. It has been predicted [2] that a weakly bound BaRb+ ion should be the dominant molecular product. In this talk, we indeed report on the first experimental observation of these molecules after three-body recombination. Furthermore, we discuss the effects of secondary and ternary collisions of BaRb+ with cold Rb atoms.

[1] A. Krükow et al., arXiv:1510.04938 (2015)

[2] J.Pérez-Rios and C.H. Greene, The journal of Chemical Physics 143, 041105 (2015)

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