Controlling the nature of a charged impurity in a bath of Feshbach dimers

Abstract

We theoretically study the dynamics of a trapped ion that is immersed in an ultracold gas of weakly bound atomic dimers created by a Feshbach resonance. Using quasi-classical simulations, we find a crossover from dimer dissociation to molecular ion formation depending on the binding energy of the dimers. The location of the crossover strongly depends on the collision energy and the time-dependent fields of the Paul trap. Deeply bound dimers lead to fast molecular ion formation, with rates approaching the Langevin collision rate ${\Gamma }_{\text{L}}^{\prime }\approx 4.8\times 10^{-9}$cm${}^3$s${}^{-1}$. The kinetic energies of the created molecular ions have a median below $1$mK, such that they will stay confined in the ion trap. We conclude that interacting ions and Feshbach molecules may provide a novel approach towards the creation of ultracold molecular ions with applications in precision spectroscopy and quantum chemistry.

arXiv comment9 pages and 12 figures including appendices

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Cited by in corpus (16)

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• Life and death of a cold BaRb${}^{+}$ molecule inside an ultracold cloud of Rb atoms
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