Bonn 2025 – scientific programme

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SYAD: Symposium SAMOP Dissertation Prize 2025

SYAD 1: SAMOP Dissertation Prize Symposium

SYAD 1.2: Invited Talk

Monday, March 10, 2025, 15:00–15:30, HS 1+2

Time-resolving quantum dynamics in atoms and molecules with intense x-ray lasers and neural networks — •Alexander Magunia — Max-Planck-Institut für Kernphysik

The dynamics of electrons in atoms and nuclei in molecules are essential to the properties of matter. While the electronic processes can be incredibly fast, on the order of a femtosecond or faster, laser pulses even shorter in time allow to resolve them nevertheless. The two main avenues for achieving such short pulses, High-order Harmonic Generation (HHG) and Free-Electron Lasers (FELs), typically imply going to the extreme-ultraviolet (XUV) and x-ray spectral regimes as well.

In this talk, the very first experiment combining FEL and HHG pulses is presented. A prototypical photochemical reaction, the coupling of nuclear and electronic responses during state-selective photodissociation of molecular oxygen, is time resolved. In addition, ultrafast electronic-population transfer mechanisms in the XUV/x-ray regime, in particular Rabi oscillations studied with absorption spectroscopy, will be addressed. This further enables machine-learning applications for reconstructing time-dependent quantum properties, such as the electronic-state populations.

Keywords: ultrafast science; photochemistry; machine learning