Hannover 2020 – scientific programme

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A: Fachverband Atomphysik

A 22: Poster Session - Atomic Physics III

A 22.1: Poster

Wednesday, March 11, 2020, 16:00–18:00, Empore Lichthof

Single-photon double ionization in two-center atomic systems — •Alexandra Eckey, Alexander B. Voitkiv, and Carsten Müller — Institut für Theoretische Physik I, Heinrich-Heine-Universität Düsseldorf

We study double ionization of an atom (atom A) via single-photon absorption in the presence of a neighbouring atom of different atomic species (atom B) [1]. The process is driven by the combined effects of inter- and intraatomic electron correlations. In this process atom B is first resonantly photoexcited , then this excitation energy is transferred radiationlessly to atom A leading to its double ionization. We show that the total rate for this two-center process can exceed the direct double photoionization of atom A by several orders of magnitude at interatomic distances in the range up to a few nanometers. Moreover, we explain the characteristic influence of the neighbouring atom onto the angular distribution of the emitted electron by introducing an effective polarization vector which depends on the relative position between the atoms.

[1] A. Eckey, A.B. Voitkiv and C. Müller, J. Phys. B, accepted (arXiv:1906.08123)