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.

arXiv comment14 pages; 9 figures; submitted to Journal of Physics B: Atomic, Molecular and Optical Physics, Joint Focus Issue on Attosecond Technology and Science

References in corpus (5)

• Attosecond streaking of correlated two-electron transitions in helium
• Attosecond time delay in the photoionization of endohedral atoms A@C${}_{60}$: A new probe of confinement resonances
• Attosecond streaking of Cohen-Fano interferences in the photoionization of H${}_2^{+}$
• Heteronuclear Limit of Strong-Field Ionization: Fragmentation of HeH${}^{+}$ by Intense Ultrashort Laser Pulses
• Break-down of the single-active-electron approximation for one-photon ionization of the B ${}^1{\Sigma }_u^{+}$ state of H${}_2$ exposed to intense laser fields