The impact of electron-electron correlation in ultrafast attosecond single ionization dynamics

Fröbel, F. G., Ziems, K. M., Peschel, U., Gräfe, S. and Schubert, A. (2020) The impact of electron-electron correlation in ultrafast attosecond single ionization dynamics. Journal of Physics B: Atomic, Molecular and Optical Physics, 53 (14), [144005]. (doi:10.1088/1361-6455/ab8c21).

Abstract

The attosecond ultrafast ionization dynamics of correlated two-or many-electron systems have, so far, been mainly addressed investigating atomic systems. In the case of single ionization, it is well known that electron-electron correlation modifies the ionization dynamics and observables beyond the single active electron picture, resulting in effects such as the Auger effect or shake-up/down and knock-up/down processes. Here, we extend these works by investigating the attosecond ionization of a molecular system involving correlated two-electron dynamics, as well as non-Adiabatic nuclear dynamics. Employing a charge-Transfer molecular model system with two differently bound electrons, a strongly and a weakly bound electron, we distinguish different pathways leading to ionization, be it direct ionization or ionization involving elastic and inelastic electron scattering processes. We find that different pathways result in a difference in the electronic population of the parent molecular ion, which, in turn, involves different subsequent (non-Adiabatic) postionization dynamics on different time scales.

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Contributors

Author: K. M. Ziems

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