Seminarium "Modeling of Complex Systems"

Hybrid systems of laser-cooled trapped ions and ultracold atomscombined in a single experimental setup have recently emerged as a newplatform for fundamental research in quantum physics and chemistry[1]. In my talk, I will present how quantum chemical calculations ofelectronic structure and scattering dynamics can support and explainquantum physics experiments. On one hand, cold charge-transfer (CT)collisions of Rb atoms with N_2^+ and O_2^+ molecular ions in the mKregime using a dynamic ion-neutral hybrid trapping experiment wereinvestigated, where state- and collision-energy-dependent reactionrate coefficients have been measured [2]. On the other hand, thecharge and spin dynamics in atomic ion-atom system of Yb^+ with Lihave been studied [3]. The theoretical analysis reveals an intricateinterplay between short- and long-range effects in the differentreaction channels which ultimately determines the CT dynamics andrates in those systems.[1] Rev. Mod. Phys. 91, 035001 (2019)[2] Nature Commun. 10, 5429 (2019)[3] Nature Phys. in press / arXiv:1907.10926 (2019)