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A: Fachverband Atomphysik

A 10: Collisions, scattering and correlation phenomena

A 10.8: Vortrag

Dienstag, 10. März 2020, 16:00–16:15, a320

Efficient double ionization by interatomic Coulombic decay — •Jacqueline Fedyk, Kirill Gokhberg, and Lorenz S. Cederbaum — Theoretical Chemistry, Heidelberg University, Heidelberg, Germany

Several processes, such as single-photon double-ionization and double Auger decay, are known, which result in correlated emissions of two electrons. The ratios of double to single-ionization in these processes usually amount only to a few percent. Recently, a new decay mechanism has been reported, which leads to double ionization of alkali dimers attached to helium droplets [1]. This double ionization proceeds via interatomic Coulombic decay and occurs with an efficiency comparable to single-ionization. Motivated by these experimental results, we investigated this new decay mechanism, which is called double interatomic Coulombic decay (dICD). In particular, we asked ourselves, if the observed efficiency of dICD was its general characteristic, or if these results were due to the specific choice of the experimental system. To answer this question, we analytically derived the decay width of dICD. First, we developed an asymptotic formula, based on the assumption that the two centers are spatially well-separated. Second, we derived a general analytical expression by using many-body perturbation theory. Finally, we investigated the efficiency of dICD for experimentally realizable small atomic and molecular clusters.

[1] A. C. LaForge, M. Shcherbinin, F. Stienkemeier,R. Richter, R. Moshammer, T. Pfeifer, and M. Mudrich, Nature Physics 15, 247 (2019)