The impact of electron-electron correlation in ultrafast attosecond single ionization dynamics
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.
- Publication:
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Journal of Physics B Atomic Molecular Physics
- Pub Date:
- July 2020
- DOI:
- 10.1088/1361-6455/ab8c21
- arXiv:
- arXiv:2002.11633
- Bibcode:
- 2020JPhB...53n4005F
- Keywords:
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- photoemission;
- single-photon ionization & excitation;
- ultrafast phenomena;
- Physics - Atomic Physics;
- Quantum Physics
- E-Print:
- 14 pages