“…The development of attosecond VUV/XUV pulses has opened new doorways for imaging and steering electron dynamics in many-electron systems, in particular, molecular systems. − Recent examples also include retrieving real-space movies of the internal motion in molecules, , monitoring the birth of a photoelectron in helium, extracting photoionization time delays of molecules in the vicinity of shape and Feshbach resonances, ,,− and the observation of correlation-driven charge migration in a DNA building block . The use of these light sources usually leads to ionization, where in addition to the photoelectron ejection, other processes involving two or more electrons can also take place, e.g., autoionization of Feshbach resonances, ionization leaving the remaining ion in an excited state (shakeup), inner-shell ionization followed by Auger decay, and Auger decay combined with shakeup.…”