Rostock 2019 – scientific programme

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A: Fachverband Atomphysik

A 32: Collisions, scattering and correlation phenomena

A 32.5: Talk

Thursday, March 14, 2019, 15:15–15:30, S HS 3 Physik

Progress in Time-Resolved Interatomic Coulomb Electron-Capture by Ba²⁺ near Rb — •Axel Molle^1,2, Oriol Vendrell³, and Annika Bande¹ — ¹Institute for Methods for Material Development, Helmholtz-Zentrum Berlin — ²Institute for Chemistry and Biochemistry, Freie Universität Berlin — ³Physikalisch-Chemisches Institut, Universität Heidelberg

Results of a time-resolved numerical investigation of the Interatomic Coulomb Electron Capture (ICEC) is presented. In the ICEC process, a species A captures a free electron by long-range energy transfer through Coulomb interaction to a bound electron in a neighbouring species B. From a theoretical perspective, ICEC was first predicted for atoms and molecules through scattering theory resulting in an asymptotic approximation [1], and then successfully modelled by electron dynamics in low-dimensional semiconductor systems [2]. We do, however, foresee high relevance for ICEC in the field of ultracold atoms and further the need for a full dynamics description of the process. From the experimental side, techniques for trapping ultracold ions and atom clouds are advancing. Employing MCTDH for fermions, we present progress in the electron dynamics of such an exemplary experiment of a barium(II) cation trapped in a cloud of rubidium atoms at ultracold temperatures. In contrast to the previous theoretical studies, this comprises four continuum dimensions and the Coulomb interaction in its electric dipole-dipole approximation.

[1] Gokhberg, and Cederbaum, Phys. Rev. A 82 (2010).

[2] Pont, Bande, and Cederbaum, J. Phys. Cond. Matter 28 (2016).