I will review our recent studies on attosecond photoionization dynamics in complex cases where, e.g., multiple resonances are simultaneously excited, spin-orbit components overlap, Cooper minima are transferred by intershell correlation, or decoherence comes into play.
We employ laser-induced electron diffraction (LIED) coupled with state-of-the-art quantum dynamical calculations to reveal a linear-to-bent transition that is enabled by the Renner-Teller effect in field-dressed molecules investigated with a single-pulse pump-probe excitation and measurement.
We present a novel approach to determine the relative delay jitter between a train of attosecond pulses and an infrared field with sub-femtosecond resolution, enabling pump-probe experiments on the attosecond timescale using seeded free electron lasers.
Imparting control over extreme ultraviolet frequency light is challenging. Opto-optical modulation provides a means to both spatio-temporally control these frequencies, and probe Stark-induced phase changes, driving towards experimentally measured reconstruction of unknown nonlinear Stark-shifts.
We investigate the strong field ionization of photoexcited I$_2$ molecules by 1.3 $\mu$m laser pulses. When the molecule is stretched, we observe a large modification of the laser-assisted electron scattering cross-section that we assign to the evolution of a molecular shape resonance.
Here we elucidate the nature of the initial state for the hole-migration dynamics following ultra-fast ionization in the molecular ion, by quantitatively predicting its electronic coherence and eigenstates content.
