Аннотация:Results from the first soft X-ray user experiment at the European XFEL on nonlinear photon-matter
interaction will be presented. Angle-resolved electron time-of-flight spectroscopy employed at the AQS (Atomic-like Quantum Systems) endstation of the SQS (Small Quantum Systems) instrument reveals insight into the character of resonances in highly transient, core ionized neon ions, i.e. Ne+ 1s12s22p6
→ Ne+* 1s02s22p6np, together with their respective relaxation dynamics. Enabled by the unique properties of the European XFEL, novel perspectives on efficient nonlinear spectroscopy will be discussed